Question about LT1/6speed
Thread Starter
Intermediate
Joined: Jun 2006
Posts: 28
Likes: 0
From: Rodeo CA
Question about LT1/6speed
Yesterday I drove a 93 with a 383 stroked LT1 and a 6 speed. It had guldstrand suspension. When I got on it, the shifter went up and down in the console with the torque of the motor. I asked the owner about it and he told me it was the power. That didn't seem right to me since that would mean a loss of energy to the wheels or something was really flexing. I was thinking a bad trans mount or something loose in the center of the car. What do you think? Please help.
Thanks
Thanks
Melting Slicks
Joined: Dec 2004
Posts: 3,281
Likes: 50
From: Jacksonville, FL
St. Jude Donor '08 thru '25
One more thought to add. Over at the ZR1NetRegistry site in the "common issues" or "How To" sections of the maintenance section there is a write up about the movement of the shifter...sorry I do not remember exactly the contents of the article...may want to check that out also?
If is isn't the motor mounts could it be the C-beam?
Tom
If is isn't the motor mounts could it be the C-beam?
Tom
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
A little movement isn't unheard of... but I would be sure the c-beam bolts were good and tight.
Inspect the transmission tail shaft and the differential input shaft housings to be sure they haven't fractured.
And yes, the motor mounts need checked out.
Inspect the transmission tail shaft and the differential input shaft housings to be sure they haven't fractured.
And yes, the motor mounts need checked out.
Burning Brakes
Joined: Oct 2002
Posts: 983
Likes: 1
From: Bergen County NJ
It's probably not the engine mounts. The C-beam (which ties the rear of the tranny to the differential) is loose. The C-beam is the rear support for the tranny and if it's loose the transmission will pivot about the engine mounts and the shifter will move up and down quite a bit. When it's tightened down properly, the shifter will be solid (as Carpenter mentioned). There's a good chance that the tranny's rear seal and tailshaft bearing may have been damaged. I speak from experience - my car was this way when I bought it. I paid someone to fix it and it wasn't cheap.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
10 Things C8 Corvette Owners Hate (But Won't Tell You)
Joe Kucinski
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!
Brett Foote
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)
Joe Kucinski
Le Mans Master
Joined: Aug 2002
Posts: 6,079
Likes: 3
From: Clearwater FL
St. Jude Donor '06
Mine did the same thing after I pulled the rear end. Shifter would move up and down a lot with just light throttle. The 2 front C-beam bolts were very loose which I found odd because I didn't loosen them, but once they were tightened, all was fine. Mine was an easy fix.
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
Originally Posted by myxss84
The car doesn't leak, but I guess that doesn't necessarily mean it couldn't be damaged right. Is that a fix someone could do on their own? Tighten the c-beam I mean.
It is possible for one or both to be broken at the mounts without leaking... I will stress this - It's HIGHLY unlikely.
I would bet on the lose bolt theory.
Just get under there with a couple 19mm wrenches... one up top and one under... this car is a canidate for "beam plates." these are metal plates with the bolts welded to them. The idea is real simple... the plates hold the bolts, and at the same time, the plates actually help absorb some of the driveline torque. This eases the effect of the right rear tire kicking out under hard acceleration. The term is "Torque vectoring," and the plates actually help ease it. I have them... and I couldn't believe the improvement.
They are available from www.zfdoc.com.
