Drained out old fluid on both diffs at 750 miles to install 75w90 syn. fluid front diff looked new,rear diff. came out life crap. Those dana 44s must be built tight,non posi.

 

I have the 373 gear with limited slip differential, so I'll need the supplement added to the rear. Is there any recommendations for this?

 

You probably weren't in 4WD very much if at all during that 750 miles so there wasn't much load placed on the gears in the front diff.

 

I have the same in my D44. with the LSD.

I used Mopar 75W-140 gear lube with the Mopar Limited Slip Adative P/T# 04318060AB. It's a 4 FL OZ bottle, used it all last change, no issues what so ever.

 

Dealer scam... Mine attempts to charge me $120 per diff but I always laugh. It's very simple to do this on your own. Look for one of the how-to's and start doing it yourself. I do mine 1 week after oil change or next following oil change if I didn't offroad any during that time.

 

U don't need the additive if u use synthetic gear oil

 

Agreed, when you go the Royal Purple route, they have it in the oil.

It's my understanding the MOPAR product which I used does not contain the additive, and is a seperate little bottle that needed to be added.

Either road you go down, it's all good.

 

That's not exactly true. For example Mobil 1 does not have the additive, read the label of what your buying. I like Redline, it has the additive like RP but costs about $5 less per quart.

 

I'm changing mine this weekend, installing ARB diff covers & using Redline synthetic in the rear dana 44 and regular 75-80 in the dana 30 front.

 

Sometimes dealers suck... Had my 09 in for an oil change... I knew the diff service was coming up, but they wanted $139.00 for REAR ONLY...

Anyone want to tell me what they are doing for a "Rear Diff service" besides changing the oil???

Needless to say, I have four quarts of Royal Purple in my garage that will have new home this weekend...


Anything need to be looked at besides fluid?

2009 23k miles (yes, I don't drive her much)