I want to change the fluid in my rear diff today but, I am not sure wich diff I have: the 60,70 or 80. How can I find out. I have a 01-3/4 ton 4x4 with 3.54 gears. ???

 

it should be a 70 rear....60 front i don't beleive it comes any different w/ your style truck

 

Thanks

 

60 for the front. 70 or 80 rear. If it is a automatic transmission it is a 70, If it's a manual it's a 80

 

if I remember right from when I changed my fluid(60 front 80 rear) you need 7 quarts of fluid all together .......3 front........4 rear

 

There is a decal inside the glove box on mine. Tells which rear is in the truck. I'm pretty sure that the older trucks had the decal under the hood. I'm sure you will have one, just have to find it. Should be a 60 up front, and a 70 if an auto, or an 80 if a stick on the rear.
John

 

Lots of info here at Fritz's for axles and other things.
http://www.dodgeram.org/tech/specs/Ramspecs.htm

Just work your way down through the blue links until you get to the data page for your component. There will be lube capacities listed there too.

Usually underneath the hood, in the latch area, there is a build sheet for your truck. On it is the optional equipment. Your rear axle might be on it. If it has a limited slip option, that will also be listed. It might be a bit faded by now though.

 

Thanks for all the help yall ;D I have a 60 front and 70 rear. ;D

 

Did you get it changed? What kind and weight of oil did you use???

 

I used SAE 90, and 2 bottles of the Mopar modifier for my positrack.