Tried to search "differential oil" but because oil is only 3 letters, I can't and "differential" turned up to many hits, so here's my question:

If I want to change out to synthetics in my front and rear diffs and transfer case, what are my options THAT MEET Dodge specs?

Thanks,
~Rob

 

For the search, try the google search at the bottom of the page.

As far as synthetics, I am running Mobil 1 in the differential cases, and I believe a Quaker State ATF in the transfer case. Speaking of which, I need to change both. Not sure if they meet Dodge's specs, but I am way past warranty.

 

castrol syntorq for the diff. because, from what i hear you need a loan to buy mobil 1. but thats jus heres-say

 

I just put a tad over 3qts of Amsoil ATF in my t-case this weekend. Seems a bit more smooth going into 4x4 now...but was never really a problem before either
Here's a tip though...when you drain the t-case, remove the fill plug before the drain plug

 

I use Redline D4 ATF in the t-case with good results-- very smooth shifting in and out.

For the Diffs, I use Redline 75w-90 if I can get it, otherwise whatever synthetic (valvoline, M1, etc) they have at the local parts store.

jlh

 

In this part of the country, I prefer a synthetic 80w-140 in the differential. Not what Dodge calls for but seems quietier and smoother in hotter weather, and better protection, IMO, when towing or working your truck hard. I get a lot less "dust" or debris on my magnets with the heavier fluid.
Know of nobody that has had negative side effects with this slightly heavier gearlube.

RJ