What differential oil to use when regear from stock 4.10s to Yukon 5.13s ?

[CarbonSteel]

The Diff shop I had put in my TruTrac uses 76MBP oil 85w140 in just about every differential that comes out of their shop.

I am using Shell Spirax 85W-140 and Valvoline High Performance 85W-140 to break mine in. After I put about 5K on the axles (with multiple oil changes), I will be switching to Valvoline 75W-140 in the rear and 75W-90 in the front.

Sponsored

 

[Pinion]

Whatever the manual says, do that.

 

[mwilk012]

Whatever the manual says, do that.

which manual? If you change gears, you should follow the gear manufacturer.

 

[Pinion]

which manual? If you change gears, you should follow the gear manufacturer.

Gears are gears. They aren't made with some special alloy or anything. Do what you want though.

 

[word302]

What would be the procedure for front break in? Normal highway driving in 2H the front isn't even rotating. You would have to consider only miles when 4W was engaged, and you wouldn't want to do that just driving down the paved road. In a little over a year I've done about 16 trails, all of which added up would still be less than 500 miles, and I was only running 4W for a fraction of those miles. Maybe if the OP lived in an appropriate climate he could get some miles of highway driving in the snow running 4W high.

Just running it in 4H on a stretch of straight highway. Even subtle curves are fine. Don't overthink it.

 

[JeepFiend]

I'm partial to Amsoil 75w-90, but if you live in hot climate year round you may want to adjust.

 

[mwilk012]

Gears are gears. They aren't made with some special alloy or anything. Do what you want though.

Lol, they literally are though, made of special alloys.

 

[Pinion]

Lol, they literally are though, made of special alloys.

I think you missed my point completely. Enjoy your snake oil.

 

[No IFS]

Amsoil 75w–140 the new Dana 44 axles fluid Capacity has been reduced. They did a drain plug to encourage more frequent changes. Definitely use a high-quality synthetic. Lower gear ratio = smaller pinion = faster spin= more heat.

Sponsored