Need some help with gear lube choice (LSD 8.25)

[DirtyApe]

I just got a new-to-me truck that has a Chrysler 8.25 LSD (anti-spin) differential. I'd like to change the fluid (50k on it),and I'd like to know what commonly-available fluids has the additive already in it?

I see Mobil 1 75w90 for about $8 locally, and it says fine for conventional and limited slip, but it does not say about having the additive however.

I'm a bit lost I guess. I'd rather get the fluid with it already included since the only bottles of the additive are about $6 locally, in ADDITION to the normal lube.

It calls for 75W90..

 

[H2GURU]

I use this M1 75W-90 and it is great stuff. Additive is already in it, as it is in most gear lubes. Pennzoil makes a gear lube w/o for use in final drives that don't need it such as marine and some industrial applications. If you tow, I would move up to the 85W-140 grade for that extra measure of protetion. I do change out my fluid every 30,000 miles as this is a requirement for my truck (electric locker that works best with cleaner fluid).If you opt for conventional fluid, I have researched and Pennzoils' seem to be the best. Their website has an extremely detailed pdf file that can give you more facts. I went with the SYNTHETIC to try and eke out a few % points of mileage but the savings in my application is only chump change. Good luck with your choice and I'll add the Bitogers' credo -"Always remove the FILL plug FIRST, so after you drain - you can fill again!".

 

[DirtyApe]

I went with the M1 75-90, buttoned it all back up and did some figure-8's in a parking lot, no noise or jerkiness so I guess all is well

thanks! and yea I've heard that tip before, make sure to get the fill out first

Have a good one!