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I think the SRW 250/350 is Ford/Sterling rear end and Dana 60 front. The DRW 350 is Dana 80 rear and 60 front. I think this is right , but I've been wrong before.
The srw's use the sterling 10.25, they have since the 90's.
Dug this up;
��� A: SRW Super Duty's from '99-'01 wear a Dana 50 in the front (4x4 only). The Dually's wear a Dana 60. In '02 the front axle was changed to a Dana 60 for ALL Super Duty's (SRW & DRW). All SRW trucks use a Sterling 10.5" full floating axle in the rear. Dually's use a Dana 80.
Is it a Dana 80 in the rear and a Dana 60 up front?
08' dually,CC, 3.73.
Correct, '08 dually has D60 front and D80 rear. SRW use Sterling/Ford 10.5 rear. Pre-'02 the front was a D50. F450 and F550 use larger Dana rear axles, I think a 110 and 135.