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Originally Posted by wrenchmonster
I think the Detroit requires LSD fluid. The vibration you are describing when it's in 4wd and underload is text book wrong fluid. I've seen a lot of this on GM product on rear limited slips where owners or the lube shops don't put in an LSD additive like BG.
For the cost of new fluid, it's worth a shot to change the fluid out and add a LSD additive and keep your finger crossed. Unfortunately, the damage may already be done. Even changing out the fluid may not help. The only way you can tell would be to take the 3rd member out and inspect clutches and clearances.
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Well spoke with Detroit and this is what they said:
"The 90wt oil is a good choice for a Truetrac, friction additive is not required and should not be used."
He seems to think it is due to the differances in tire wear... i measured from ground to top and only get about 1/2 -3/4 inch differance, he thinks its enough any one else have experiance in this area?
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1995 sas 4runner worked on by Cornfed... blew up week later
1993 SAS 4Runner, 4.88s, locked front, TRD e-locker rear with Inchworm kit, 35x12.5 BFG MT's, rock crawling rear bumper, All Pro front tubular bumper with Mile Marker SE12000 winch, Hella 500's, front & rear hitches, sliders, k&n drop in with ARB snorkel, custom duals, Federal Signal siren with whelen red strobes! custom front spring mounts rear susp. added another 2" of susp lift totaling at about 9"
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