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Diff oil question

2K views 9 replies 9 participants last post by  Old Dogger 
#1 ·
Am about to change the diff oil on my jku.Mine does not have lsd. My question is will it be ok if I use royal purple 75w90 with friction modifier additive?
 
#3 ·
I run 75w-90 royal purple in my front diff, and I have a rubicon so no LSD, works just fine.
 
#4 ·
only tow a 4x8 utility trailor a couple of times a year.

I followed the wayoflife writeup:

MAINTENANCE : Jeep JK Wrangler Differential Fluid Change Write-Up

rear diff was easy. Gear oil was black.

Front was PITA. had to use a tube so i could get enough Clarence to feed in the gear lube. Gear oil was still good (mostly clear) but changed it anyways.

I am hoping 75w will be better for extreme cold temperatures if its anything like last winter (couple of days it was -45C with the wind chill!!)
 
#8 ·
The friction modifiers shouldn't be a problem for a non-LSD or e-locker differential. I understand wanting to use syn in the front so you just buy one type of oil, but the front will be fine with 80W-90 dino oil.
 
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