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Old 11-09-2017, 05:14 PM   #13
PPUMPFUMMINS
 
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Name: PPUMPFUMMINS
Title: Diesel Enthusiast
Status: Not Here
Join Date: Apr 2017
Location: Pennsylvania
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Posts: 128
Quote:
Originally Posted by ISBand4BT View Post
I believe this is what i heard in the past... it didnt make much sense to me, but it's hard to tell.

I do have another question while i've got everyone's attention... This new truck has a limited slip rear. The dealership i bought it from replaced the bearings. Their work order shows putting 75-90W in, but doesn't show any additive. Truck was fine for about 1400 miles then started making a noise in the rear end. I've read that the new rear ends do and dont require the additive.

Can anyone confirm if you do or dont, and if it does require and it's not put in, will it trash the limited slip?
If it's a limited slip ( will have a L in your gear ratio tag on diff) it needs to have friction modifier in it or the clutches will chatter. Or wear prematurely. One bottle per differential.
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