Exhibit 99.3

                            CERTIFICATION PURSUANT TO
                             18 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                 SECTION 906 OF THE SARBANES - OXLEY ACT OF 2002

In connection with the Quarterly Report of Swift  Transportation  Co., Inc. (the
"Company")  on Form 10-Q for the period  ended  June 30,  2002 as filed with the
Securities and Exchange  Commission on the date hereof (the  "Report"),  I, Gary
Enzor,  Chief Financial Officer of the Company,  certify,  pursuant to 18 U.S.C.
section 1350, as adopted  pursuant to section 906 of the  Sarbanes-Oxley  Act of
2002, that to my knowledge:

     (1)  The Report fully  complies with the  requirements  of section 13(a) or
          15(d) of the Securities Exchange Act of 1934; and

     (2)  The  information  contained  in the  Report  fairly  presents,  in all
          material respects,  the financial  condition and results of operations
          of the Company.


/s/ Gary R. Enzor

Gary R. Enzor
Chief Financial Officer
August 12, 2002