              UNITED STATES SECURITIES AND EXCHANGE COMMISSION
                             Washington, D. C. 20549


                                    FORM 8-K


                                 CURRENT REPORT
                       Pursuant to Section 13 or 15(d) of
                       the Securities Exchange Act of 1934



         Date of Report (Date of earliest event reported) MarchApril 15, 2005


                     NAVISTAR FINANCIAL 2004-B OWNER TRUST
             (Exact name of Registrant as specified in its charter)


                                    Delaware
                 (State or other jurisdiction of incorporation)



            333-67112-06                               51-0337491
      (Commission File Number)            (I.R.S. Employer Identification No.)




  425 2850N. WestMartingale Golf Road Rolling MeadowsSchaumburg, Illinois             60008              60173
   (Address of principal executive offices)             (Zip Code)



         Registrant's telephone number including area code 847630-734753-4000


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                    INFORMATION TO BE INCLUDED IN THE REPORT


Item 8.01.  Other Events.


            On MarchApril 15, 2005, the Registrant made available the
            Monthly Servicer Certificate for the Period of FebruaryMarch 2005
            for the NAVISTAR FINANCIAL 2004-B OWNER TRUST,  which  is
            attached as Exhibit 20 hereto.


Item 9.01   Financial Statements and Exhibits.


         (c)      See attached Exhibit 20.


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                                   SIGNATURE


Pursuant  to the  requirements  of the  Securities  Exchange  Act of  1934,  the
Registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned thereunto duly authorized.


                      NAVISTAR FINANCIAL 2004-B OWNER TRUST
             (Exact name of Registrant as specified in its charter)



Date:  MarchApril 2826, 2005                     By:/s/ PAUL E. MARTIN
-----------------------                          --------------------------
                                                 Paul E. Martin
                                                 Vice President & Controller


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                                  EXHIBIT INDEX

Exhibit No.    Description

   20          Navistar Financial 2004-B Owner Trust
               Monthly Servicer Certificate #45, dated MarchApril 15, 2005


================================================================================


                                   EXHIBIT 20

                   Navistar Financial 2004 - B Owner Trust
                                                  For the Month of FebruaryMarch 2005
                                            Distribution Date of MarchApril 15, 2005
                                                     Servicer Certificate  #45

Original Pool Amount                                                                                            $398,463,516.43
Subsequent Receivables (transferred 11/17/04)                                          $148,829,668.80
Subsequent Receivables (transferred 12/17/04)                                          $151,771,733.07
Subsequent Receivables (transferred 01/18/05)                                            $50,934,291.61
Beginning Pool Balance                                                                                        $686668,843210,337655.7234
Beginning Pool Factor                                                                                                      0.91579218909485

Principal and Interest Collections:
     Principal Collected (Incl. Servicer Advance Repay)                        $1817,442383,209073.3903
     Interest Collected                                                                                          $3,990986,547758.6671
     Mandatory Prepayments                                                                                                    $0.00
Additional Deposits:

     Repurchase Amounts                                                                                                          $0.00

     Liquidation Proceeds / Recoveries                                   $0182,678.0026
Total Additional Deposits                                                $0182,678.0026

Repos / Chargeoffs                                                                                                        $190175,472453.9984
Aggregate Number of Notes Charged Off                                       21                                             29

Total Available Funds                                                                                            $2220,432637,757526.0568

Ending Pool Balance                                                                                              $668651,210567,655111.3479
Ending Pool Factor                                                                                                            0.89094858687571

Servicing Fee                                                                                                                  $572556,369842.4521
     memo: Servicer will allocate $1,500.00 of Servicing
           Servicing Fee as Administration Fee
Repayment of Servicer Advances                                           $0914,983.0032
-------------------------------------------------------------------------------------

Memo Item - Reserve Account:
     Prior    Opening Month Balance                                                                                           $20,605046,300319.1366
     
    Invest. Income                                                                                                         $3740,876326.0116
         Excess Service                                                                                                   $1,488723,388984.5690
         Transfer (to)Collections Acct                                       $                                                               0.00
                                                                                                                                ------------------
    Collections Acct
    Beginning Balance                                                                                                $2221,131810,564630.7072

-------------------------------------------------------------------------------------

Reserve Account:
     Beginning Balance  (see Memo Item)                                                        $2221,131810,564630.7072
     Target Percentage                                                                                                            3.00%
     Target Balance                                                                                                $2019,046547,319013.6635
     Specified Yield Supplement Amount                                                                            $0.00
     Specified Yield Supplement Amount                                                                            $0.00
     Specified Reserve Account Balance                                                          $2019,046547,319013.6635
     Minimum Balance                                                                                              $14,999,984.20
     (Release) / Deposit                                                                                      ($2,085263,245617.0437)
     Ending Balance                                                                                                $2019,046547,319013.6635

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Current Weighted Average APR:                                                                                            7.049032%
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-------------------------------------------------------------------------------------
Current Weighted Average Remaining Term (months):                        48                              47.6679
-------------------------------------------------------------------------------------

Delinquencies                                                                                                                          Dollars    Notes
                             Installments: 1 - 30 days            3                  2,307329,546742.0186    32,501309
                                           31 - 60 days             564                   426,270796.9838      571418
                                           60+  days                 74                       69,995628.8514       62

                                    Total:                        3                              2,946826,812167.8438    32,502324
                                 Balances: 60+  days              2                    1,346622,430953.9236       62


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Navistar Financial 2004 - B Owner Trust
For the Month of FebruaryMarch 2005
                                                                                                                                   NOTES                                                                       CLASS B        CLASS C
                                                       TOTAL        CLASS A - 1     CLASS A - 2     CLASS A - 3     CLASS A - 4               NOTES          NOTES
                                             $750,000,000.00 $113,000,000.00 $240,000,000.00 $183,000,000.00 $169,000,000.00 $26,250,000.00 $18,750,000.00
Original Pool Amount

Distributions:
      Distribution Percentages  1              100.00%           0.00%           0.00%           0.00%          0.00%          0.00%

      Coupon                                   2.2000%         2.7200%         3.1300%         3.5300%        3.3900%        3.9300%

Beginning Pool Bal    Balance $686668,843210,337655.7234
Ending Pool Balance       $668651,210567,655111.3479

Collected Principal         $1816,442468,209089.3971
Collected Interest             $3,990986,547758.6671
Charge - Offs                           $190175,472453.9984
Liquidation Proceeds
     Proceeds/ Recoveries                  $0182,678.0026

Servicing &
      Administration Fee   $572556,369842.4521
Investment Earnings
            from Pre-FundingFund Acct      .       $0.00
Cash Transfer from
            Negative Carry Acct        .      $0.00
Cash Transfer from
            Pre-Funding Acct.                   $0.00
Cash Transfer from
      Reserve Account            Acct. $0.00
Total Collections Avail
           for Debt Svc      Svcs     $2120,860080,387684.6047

Beginning Balance           $686668,843210,337655.7234  $4931,843210,337655.7234 $240,000,000.00 $183,000,000.00 $169,000,000.00 $26,250,000.00 $18,750,000.00

Interest Due 2                     $1,739713,316156.6602      $8559,287126.4985     $544,000.00     $477,325.00     $497,141.67     $74,156.25     $61,406.25
Interest Paid                       $1,739713,316156.6602      $8559,287126.4985     $544,000.00     $477,325.00     $497,141.67     $74,156.25     $61,406.25
Principal Due                     $1816,632643,682543.3855  $1816,632643,682543.3855           $0.00           $0.00           $0.00          $0.00          $0.00
Mandatory Prepayments
          Class A-1 only                           $0.00           $0.00
Principal Paid                   $1816,632643,682543.3855  $1816,632643,682543.3855           $0.00           $0.00           $0.00          $0.00          $0.00


Ending Balance                 $668651,210567,655111.3479  $3114,210567,655111.3479 $240,000,000.00 $183,000,000.00 $169,000,000.00 $26,250,000.00 $18,750,000.00
Note / Certificate Pool Factor
     (Ending Balance/Original Pool Amt)        0.27620051289125       1.0000000       1.0000000       1.0000000      1.0000000      1.0000000

Total Distributions         $2018,371356,999699.0457  $1816,717702,969670.8740     $544,000.00     $477,325.00     $497,141.67     $74,156.25     $61,406.25


Interest Shortfall                             $0.00           $0.00           $0.00           $0.00           $0.00          $0.00          $0.00
Principal Shortfall                           $0.00           $0.00           $0.00           $0.00           $0.00          $0.00          $0.00
               Total Shortfall                    $0.00           $0.00           $0.00           $0.00           $0.00          $0.00          $0.00
Excess Servicing
      (see Memo Item-
          -Reserve Acct  $1,488723,388984.5690

Beginning Reserve
            Acct Balance           $2221,131810,564630.7072
(Release)/Draw                   ($2,085263,245617.0437)
Ending Reserve
            Acct Balance           $2019,046547,319013.6635

1) (a) 100% to the Class A-1 Notes until the Class A-1 Notes are paid in full.  (b) 94.00% of any amount remaining after the
       application of funds in clause (a) to the remaining Class A Notes sequentially until the Class A Notes are paid in full.
   (c) 58.33% of any amount remaining after the application of funds in clauses (a) and  (b) to the Class B Notes until the Class B
       Notes are paid in full.  (d) Any amount remaining after the application of funds in clauses (a), (b) and (c) to the Class C Notes
       Notes until the Class C Notes are paid in full.
2) Class A-1  Interest based on Actual Number of Days.  Interest on other classes based on a 30 day month.  Interest   for first
   settlement based off 28 days, from 11/17/04 to, but excluding, 12/15/04.

(* x represents previously paid interest to other classes.)
(* y represents previously paid interest and principal on other classes.)
========================================================
Memo Item - Advances:
   Servicer Advances - Current Month              ($790914,843983.1032)
   Total Outstanding Servicer Advances       $32,238323,167184.4008
========================================================


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Navistar Financial 2004 - B Owner Trust
For the Month of FebruaryMarch 2005

Trigger EventsA)  Loss Trigger
              B)  Delinquency Trigger
              C)  Noteholders Percent Trigger

                                                                               5                                 4                                  3              2                               1                               0
                                    Sep-04                                                 Oct-04                          Nov-04                   Dec-04                     Jan-05                    Feb-05           Mar-05

Remaining Gross Balance                                   N/A            N/A                 $441,897,747.66   $590,821,805.36   $740,229,491.93 $778,695,303.30 $757,011,197.42

A)   Loss Trigger:

Principal of Contracts Charged Off             N/A            N/A                           $42,639.97           $176,479.01           $166,381.74     $190,472.99     $175,453.84

Recoveries                                                             N/A            N/A                                     $0.00                   $500.84             $17,760.23           $0.00     $182,678.26

Total Charged Off (Months 5, 4, 3)             N/\A
Total Recoveries (Months 3, 2, 1)             $18,261.07
                                                                      -----------------
Net Loss / (Recoveries) for 3 Mos                 N/\A       (a)

Total Balance (Months 5, 4, 3)       $4411,897032,747719,553.6602(b)

Loss Ratio Annualized   [(a/b)*(12)]                 0.0000%

Trigger:  Is Ratio > 1.5%                                        No
                                                                                      Dec-04                                                                                                  Jan-05           Feb-05           Mar-05
B)   Delinquency Trigger:                                                                                                                   $1,696,521.00    $1,478,167.43         $2,346,430.92    $1,622,953.36
     Balance delinquency 60+ days                                                                                                               0.2871519969%         0.1996930133%         0.3013321439%
     As % of Beginning Pool Balance                                                         N/A                                                                0.19703%         0.26272%         0.23847%
     Three Month Average

     Trigger:  Is Average > 2.0%                         No

C)   Noteholders Percent Trigger:                 2.67286063%
     Ending Reserve Account Balance
     not less than 1% of Initial Aggregate
     Receivables Balance

Trigger:  Is Minimum < 1.0%                                 No


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Navistar Financial 2004 - B Owner Trust
For the Period 1/18/05 through 2/15/05

Pre-Funding Account:

       Beginning Balance 1/18/05                                 $50,935,081.70
       Plus: Investment Earnings                                     $73,866.25
       Less: 1/18/05 Transfer to Seller                          $50,934,291.61
       Less: Investment Earnings to Collection Account               $73,866.25
                                                                 --------------
       Ending Balance 2/15/05                                           $790.09

       Less: 2/14/05 transfer to Collections Account                    $790.09
       (Mandatory pre-payment to Class A-1)
       Ending Balance 2/15/05                                             $0.00


Negative Carry Account:

       Beginning Balance 1/18/05                                    $280,597.68
       Plus: Investment Earnings                                      $3,257.31
       Less: 2/14/05 Negative Carry Amount to Collections Account         $0.00
       Less: Investment Earnings Distributed to Seller                $3,257.31
                                                                 --------------
       Subtotal                                                     $280,597.68
       Less: Required Negative Carry Account Balance                      $0.00
                                                                 --------------
       Subtotal: Excess over the Required Negative Carry Acct Bal   $280,597.68
       Less:  Excess released to Seller on 2/15/05                  $280,597.68

       Ending Account Balance 2/15/05                                     $0.00


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Filing Compare · Navistar Financial 2004-B Owner Trust
