Rearend question?
 

A friend of mine just bought a 1990 5.0 LX(auto.)and the rearend is making a whinning noise. What could cause this? What kind of gear oil(and what weight?) should he use, after repairs? How many qts.?
Thanks!

If it's had gears done could be a bad install, or bad choice of gear manufactorer (spelling?). 3 quarts of royal purple or any good synthetic fluid should be good, w/ 2 bottles of friction modifier (if small bottles from ford). John

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89 Notch: ASP Pullies,
K&N Air,Transgo shiftkit,Trans. cooler,FMS 3 core , FMS 4:10's, 1.5" cowl, cold air kit, hooker shorties(jet hot coated), O/R H-Pipe, ASP solid mounts, Energy Sus. Trans. Mnt. BBK 70mm TB, MSD 6al, Dual elec. fans, 5.0 Firepower Kit, Scorpion 1.6 RR's, Flowmasters, 73 mm MAF, cobra intake(ported), 1" phenolic spacer,ported stock heads and crower #512 cam.

He says,it`s supose to be the stock gears.
Should he use 80-90 weight? Plus a bottle of additive,if posi.?
Thanks!

Check your axle bearings!

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92 GT, 4:10 gears, centerforce clutch, 6# powerdyne blower, bbk h-pipe, flowmasters

Thanks for the replies!