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Discussion Starter · #1 ·
Hey All-

My 99' Rodeo LS 4WD with 60,100 miles still has rear end diff chatter upon braking and take off. I changed the rear end fluids and added limited-slip additive. It's now 800 miles later and it's still doing it! Do they all do this? I don't like the way it feels, any suggestions?
 

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Tim, what viscosity of gear lube did you go with in the rear diff? From what I've seen, the clutch packs in these LSD's are pretty sensitve to visc. & brand of LSD additive. Stick with a quality 80W-90 gear lube & one tube of the dealer LSD additive & you should be OK. G/luck
Joel
 

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It was also recommended to me to run 85w140 by an Isuzu mechanic. I ran that and LSD additive without clatter on my 94 Trooper, but I'll be honest and say that I only had it in there for about 3 months.

I assume that it is most noticable on takeoff around a corner? Does it do it every time?

-Tad
 

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Discussion Starter · #4 ·
80-90 Valvoline from Napa. It was emptied completely and the additive was recommended by Napa. It does it EVERYTIME you take off or slow down. What sucks is I brought it to the Isuzu dealer at 59,300k miles and they said this is what needed to be done. However the dealer I bought it from did the service for me. Now I am out of factory warranty even though the dealership's service manager and mechanic drove the truck at 59,300 and experienced the chatter. Everyone said it takes a while for the additive to kick in but now I am about 900 miles since it was done and no better!
 

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Mobil1 and dealer LSD additive. If it continues beyond that you may have issues with the LSD. The Mobil1 will be the most inexpensive diagnostic, but take it to a shop known for it's rear-end work to check out the LSD if the problem persists. They'll pop the cover, look at the gears and tell you what's-what for not much $$$.
 

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Discussion Starter · #7 ·
All is good now! The dealer reset the suspension bushing with load. They also disassembled, cleaned and lubed the driveshaft as per Isuzu's instructions. Funny they noted "special lube" on the repair order. It must have been to justify the $147.91 bill with only $7.97 in parts.
 
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