C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Trans Mount Blues....

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Old Feb 18, 2013 | 08:00 PM
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Default Trans Mount Blues....

Hello everyone. Im trying to get car inspected and wanted to change my trans mount. I cant find one for an 89 Vette anywhere. I tried ebay but Im too stupid and my computer is too slow for it to work for me. Does anbody know where I can just place a call and have this thing delivered to my house? Even Ecklers didnt have one. This is crazy.Thank you guys so much for the help!!
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Old Feb 18, 2013 | 08:11 PM
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Old Feb 18, 2013 | 08:25 PM
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Originally Posted by BooBoo231
trans mount. I cant find one for an 89 Vette anywhere
Even Ecklers didnt have one. This is crazy..
In the same aisle as skyhooks and black and white stripped paint
Will be dead before you find one given it doesn't have one


Last edited by vetteoz; Feb 18, 2013 at 08:28 PM.
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Old Feb 18, 2013 | 08:56 PM
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Originally Posted by BooBoo231
This is crazy.
One picture worth a thousand words.......
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Old Feb 18, 2013 | 09:05 PM
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Originally Posted by BooBoo231
wanted to change my trans mount.
Suppose the obvious question is ;
why do you think the " trans mount " needs replacing?
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Old Feb 18, 2013 | 09:09 PM
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Check aisle 12, next to the chrome muffler bearings
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Old Feb 18, 2013 | 09:18 PM
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I feel a bang when I shift into second. It feels like it is under my seat. Where the back of the trans would be. I found the muffler bearings. I opted for the Inconnel 718. Chrome plated steel is too hard for the application Im using Im new to the Vette world.....does this car not have a mount? Its 17 degrees here and windy. Im not about to crawl under and check. No way jose! Ha ha.
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Old Feb 18, 2013 | 09:21 PM
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I guess maybe its my u joint? That pic makes it look like a real treat;(
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Old Feb 18, 2013 | 09:27 PM
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Originally Posted by JackDidley
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Old Feb 19, 2013 | 04:45 AM
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You are going to have to get under there to see. But besides the u joints, check the bolts that hold the c beam to the transmission and the differential. Sometimes they are loose. Also check exhaust etc. passing through that area. BTW you did not say what year or transmission you have.
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Old Feb 19, 2013 | 05:59 AM
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Originally Posted by BooBoo231
Im new to the Vette world......does this car not have a mount?
Refer the pic I posted for you above.
Rear of trans is supported by what we call the C-Beam ( file that for future reference on here ) that connects to the nose of the diff.
Autos and manuals use the same C-Beam arrangement
As noted if the bolts holding the beam to the trans are loose ( common ) then it allows the trans to move ; esp during shifts with a manual car



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Old Feb 19, 2013 | 08:32 AM
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Your bolts connecting the C-beam could be sheered off.

These are great replacements, but you may need new bolts too. Be prepared to gasp at the price.
http://www.zfdoc.com/c4beamplate.htm
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Old Feb 21, 2013 | 02:00 AM
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Its an 89' With an automatic. I tightened the bolts tonight and it made a huge difference. Thanks guys!! I still felt it ever so slightly when I am stopping and the trans kicks down. Overall an 85% improvement I would say. Maybe I have to get them a little tighter, but I didnt want to over do it. Im very glad I joined this forum. You guys rock! Maybe in the future I will upgrade to those bolts. Thank you for the link.
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Old Feb 21, 2013 | 10:26 AM
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Originally Posted by BooBoo231
Its an 89' With an automatic. I tightened the bolts tonight and it made a huge difference. Thanks guys!! I still felt it ever so slightly when I am stopping and the trans kicks down. Overall an 85% improvement I would say. Maybe I have to get them a little tighter, but I didnt want to over do it. Im very glad I joined this forum. You guys rock! Maybe in the future I will upgrade to those bolts. Thank you for the link.
Torque the c-beam bolts to 55 ft/lbs in front (tranny) and 65 ft/lbs in back (differential). If you overtorque them, you can crack the tailshaft.
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Old Feb 21, 2013 | 10:32 AM
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Originally Posted by 383vett
Torque the c-beam bolts to 55 ft/lbs in front (tranny) and 65 ft/lbs in back (differential). If you overtorque them, you can crack the tailshaft.
Concur!!!


And if its torqued to spec and still giving you issues .... remove the c beam and apply a good adhesive (liquid nails used to be the reccomended adhesive) reinstall c beam and torque to spec.
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Old Feb 21, 2013 | 12:08 PM
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Would red loctite do the trick, or is liquid nails my best option?
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Old Feb 21, 2013 | 02:06 PM
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Originally Posted by 383vett
Torque the c-beam bolts to 55 ft/lbs in front (tranny) and 65 ft/lbs in back (differential). If you overtorque them, you can crack the tailshaft.
REALLY? I never knew that. I just tighten them until I feel a muscle cramp in my side....

Or, until the I'm worried if the car will fall off the stands!




BTW...I echo post#2. Great stuff. LOL (I saw this thread yesterday but didn't look inside til today. Finally, it hit me! I coulda had a V8!

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Old Feb 21, 2013 | 03:43 PM
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Originally Posted by GREGGPENN
REALLY? I never knew that. I just tighten them until I feel a muscle cramp in my side....

Or, until the I'm worried if the car will fall off the stands!



Yeah, I read the fsm once. Another way is to brace two feet on the drivers side rear tires and tighten the bolts as much as you can until your face starts turning red and your vessels pop.
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Old Feb 21, 2013 | 04:11 PM
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Originally Posted by 383vett
Yeah, I read the fsm once. Another way is to brace two feet on the drivers side rear tires and tighten the bolts as much as you can until your face starts turning red and your vessels pop.
Pretty sure I used an impact on mine. Im too old to be popping blood vessels.
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Old Feb 21, 2013 | 04:13 PM
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Originally Posted by 383vett
Yeah, I read the fsm once. Another way is to brace two feet on the drivers side rear tires and tighten the bolts as much as you can until your face starts turning red and your vessels pop.
.......or you grind your teeth so hard you gotta see a dentist
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