I replaced my differential with a rebuilt unit. There is a whine coming from the diff. when the car is coasting in gear but goes away with the drive train is under a load. Noise seems worse than the unit I took out which was leaking at all three yoke seals. Is this normal or could there be a setup problem with the rebuilt unit? Thanks in advance for your advice.
Joel, will using an insufficient amount, or none at all, of the posi additive cause a noise? I seem to remember having noise once and adding a second bottle of GM fluid and that caused the noise to go away. But I don't think it was gear whine, it was a squeak or something like that.
1976 Silver/Firethorn. L48, 4spd. Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: email@example.com, 112 LSA, Eagle Steel Crank.
Vette(s): 1971 350 270 hp roadster millivanilli red, black interior, white rag top, white hard top, I've had it 18 years and intend on giving it to my son for his 25th birthday(another 18 years from now)
I'll tell you right now with no if ands or buts, that rear is not right. It most likely does not have enough pinion depth. Corvette rears are quiet and very rarely have any noise at all
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
daveo76 said: Joel, will using an insufficient amount, or none at all, of the posi additive cause a noise? I seem to remember having noise once and adding a second bottle of GM fluid and that caused the noise to go away. But I don't think it was gear whine, it was a squeak or something like that.
The posi additive is ONLY used to condition the clutches in the diff...it has absolutely NO bearing(no pun intended) on whether or not the gears howl when either accelerating, or decelerating....that noise is due to the gears not being properly set up....period.
My suggestion is to take it back to whomever did the work, if possible. The more you drive it the worse it's gunna get. If you don't have many miles on them(less than 50 or so), theyMIGHT be able to fix it. If they have more miles than that....it's doubtful they will ever be right, even if they gears do get set correctly. Once the gears get run in....they're in.
____________________________________ Joel Adams C3VR Lifetime Member #56 My Link
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