5Oclock

Are the 1998 and 2001 2500 rear ends the same in that the gears are interchangeable?

JAX

It depends on the transmission that is in the truck. If the truck has a manual transmission then the rear end will be the Dana 80. If the tranny is an auto, then the rear end is a Dana 70. You can interchange the 80s with each other, and the 70s with each other, but you can not change use a Dana 80 carrier and gearset in a Dana 70 housing or vice versa.

5Oclock

Thanks. Both are/were auto tranny's. He swapped out 3:77's for 4:11's after about 40K miles. He has since sold the truck but has the gears and will give them to me for a case of beer. Then all I have is the labor to swap my 3:54's for the 3:77's.

blackdiesel

Do the math, his are probley 3.54 also. Don't think there were 3.77's in 98. Save your beer.

dozer12216

Me neither. Not sure aftermarket even has for DANA 80. Were not all Diesels 80's during that time frame?

5Oclock

3:73 maybe?

Tate

You can get Dana 3.73 gears, but just not in our application from OEM. Not sure switcing from a 3.73 to a 4.10 set would be worth it, or a 3.54 for a 3.73. Thats a 5% change in final drive ratio.

haloman

Manual trans got the 80, auto got dana 70