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Good when on pedal in 6th gear. When decelerating, huge vibration. Thoughts? Trying to help a friend.
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Joined: 3/20/2009
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Vette(s): Black 1979 L-82
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Black 1999 Coupe
U-joints checked?
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 22715
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
Jim, does it only do this in 6th? That would indicate an internal trans problem, but that's a long-shot. The ZF units are pretty bullet proof normally. They do have a LOT of gear rattle, due to the size of the gears, and the clearance needed for them. Can't say that I've ever heard of one that would create a vibration only in one gear, tho...
Otherwise, I'd agree with the u-joints being the issue, either on the driveshaft itself, or one of the halfshafts. Might check the torque on the halfshaft nut in the center of the rear hubs. That can cause some wierd vibs.
Otherwise, I'd agree with the u-joints being the issue, either on the driveshaft itself, or one of the halfshafts. Might check the torque on the halfshaft nut in the center of the rear hubs. That can cause some wierd vibs.
Joel Adams
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Only in 6th...and only coming off the gas
Lifetime Member #73
The Money Pit.... and my niece
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 22715
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
Sounds like time for tranny werk...
Before digging any deeper, tho, I would first pull the driveshaft, and check the yoke, and the tailhousing bushing, to see if there was any major wear....
Before digging any deeper, tho, I would first pull the driveshaft, and check the yoke, and the tailhousing bushing, to see if there was any major wear....
Joel Adams
C3VR Lifetime Member #56
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(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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in Forum: C4 Engines, Driveline and Handling
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