ok my friends dad has a 03 Dakota 4x4 with the 3.9L in it. The rear diff just blew, and im looking at getting a whole rear assembly for him...

When looking on car-part.com, they had the 9.25 axle and a 8.25(or somthing) axle, both with 3.55 gears.

Ive looked for tags, under the hood, glovebox, and on the diff to tell me but i just dont know...what rear end do these typiclly have?


and to replace the whole rear end, just unbolt it from the leaf springs, driveshaft and all the lines/connections right? then it should come out?

 

I would be willing to bet that that truck has the 3.92:1 ratio front and rear end. there is a formula for figuring out which it is by counting the teeth on the gears but it escapes me this early in the day. Try looking through the F.A.Q. on here. i think it's count both gears and divide the ring by the pinion.

 

i think you can also jack the car up and count how many times the driveshaft turns with one wheel rotation. dont quote me though.

 

they are both 3.55 gears...

when i searched, it asked if it was a 9.25 axle 3.55 gears, or a 8. something axle with 3.55 gears....i need to know the axle cuz im replaceing the whole rear end.

 

Rear Axle Assy

4x2, round cover (10 bolt, 8.25" ring gear), drum brakes, 3.21 ratio
4x2, round cover (10 bolt, 8.25" ring gear), drum brakes, 3.55 ratio
4x2, round cover (10 bolt, 8.25" ring gear), drum brakes, 3.92 ratio
4x2, round cover (10 bolt, 8.25" ring gear), disc brakes, 3.21 ratio
4x2, round cover (10 bolt, 8.25" ring gear), disc brakes, 3.55 ratio
4x2, round cover (10 bolt, 8.25" ring gear), disc brakes, 3.92 ratio
4x2, hexagon cover (12 bolt, 9.25" ring gear), 3.55 ratio
4x2, hexagon cover (12 bolt, 9.25" ring gear), 3.92 ratio
4x4, round cover (10 bolt, 8.25" ring gear), 3.55 ratio
4x4, round cover (10 bolt, 8.25" ring gear), 3.92 ratio
4x4, hexagon cover (12 bolt, 9.25" ring gear), 3.55 ratio
4x4, hexagon cover (12 bolt, 9.25" ring gear), 3.92 ratio



its a 4x4...3.55 gears...12 bolt, dont know the ring gear....

 

Seems to me that it can only be one of those.