Crooked motor?
Thread Starter
Melting Slicks
Joined: May 2003
Posts: 2,387
Likes: 2
From: Meriden CT
Crooked motor?
We recently installed a new 383 in our '70 vert, and it has a 4 spd. Drove the car 2 weeks ago, did a donut or two, and parked it, no problem. Get in the car this past weekend, and as soon as I lay into the throttle, the shifter violently jolts to the right, and I hear some loud noises. Put the car in the air, and there are rings on the driveshaft where it rubbed, and its definatley not strait within the tunnel. Pull it out to inspect, and its perfectly strait. When I look at the motor from inside the car, it looks crooked in the engine bay. My motor mounts are tight, brand new, and my tranny mount is pretty new, and all looks tight there. I then fired it up again, revv'ed it up a few times, and the shifts a bit like it should, so the mounts are definatley holding (Delco rubber mounts).
Moving back to the rearend, everything looks good, is next to new, and wasnt touched during the motor swap. What could my problem be? Could I just have a bad motor mount?
Thanks
Joe
Moving back to the rearend, everything looks good, is next to new, and wasnt touched during the motor swap. What could my problem be? Could I just have a bad motor mount?
Thanks
Joe
Race Director
Joined: Mar 2001
Posts: 11,322
Likes: 1
From: Living in the Hartland
What do you mean the mounts are nice and tight? With the hood up try putting the car in gear with the parking brake on and let out on the clutch some, the eng will torq up on the driver side most likely if the driver side mount is busted.
Tech Contributor
Joined: Aug 1999
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From: Connecticut, USA
Joe it sure sounds like mounts. I had a sheared left mount in my car and didn't know it until I was test driving it without the shift boot one day. I noticed the tranny shifting to the right side everytime I shifted it. When I removed it, it fell in two pieces. You didn't have theproblem before the new motor right?
Gary
Gary
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Joined: Mar 2001
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From: Living in the Hartland
Originally Posted by gtr1999
Joe it sure sounds like mounts. I had a sheared left mount in my car and didn't know it until I was test driving it without the shift boot one day. I noticed the tranny shifting to the right side everytime I shifted it. When I removed it, it fell in two pieces. You didn't have theproblem before the new motor right?
Gary
Gary
Forgot to mention I had one go, it does not tear apart into peices but rather the rubber separates from the metal so when it is still installed it looks fine but when you pull the eng the it will come a part.
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Joined: Nov 1999
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From: Foxfield CO 1970 Convertible
Originally Posted by Fevre
Forgot to mention I had one go, it does not tear apart into peices but rather the rubber separates from the metal so when it is still installed it looks fine but when you pull the eng the it will come a part.
Safety Car
Joined: Jul 2002
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From: St. Charles IL
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Originally Posted by joe73vette
Jack up on that tranny mount, I'll bet it sheared. Joe
Maybe motor mounts too. Were they new with the new engine? OOPS I didn't read enough of your post, I see they were new. 383's are torque monsters, you might want something a little stronger then stock mounts, like polyurethane.
Last edited by Big Fish; Oct 15, 2004 at 09:35 PM.
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Thread Starter
Melting Slicks
Joined: May 2003
Posts: 2,387
Likes: 2
From: Meriden CT
Yea, I guess my first thing to do is buy a set of poly motor mounts. They arent too expensive. Is there anyone who makes a poly tranny mount that will work with a '70? I didnt even think to jack up on the back of the tranny at all, the mount "looks" to be fine, but I guess it sure could be separated from the steel. That would definatley explain what happened. Thanks for all the input...
Joe
Joe
Tech Contributor
Joined: Aug 1999
Posts: 15,175
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From: Connecticut, USA
Joe stay away from the Energy Suspension tranny mount,#3.1108G, it doesn't fit corvette. I have one sitting on my bench for a year now,new in box. They fit everything but a vette even though the Summit cat says all. I used one form the other poly company in Jegs cat but I don't recall the name off hand, I had to call both poly companies direct to find out.
Gary
Gary
Thread Starter
Melting Slicks
Joined: May 2003
Posts: 2,387
Likes: 2
From: Meriden CT
Which motor mounts do I need? Short and Wide, or Tall and Narrow?
http://www.jegs.com/cgi-bin/ncommerc...74&prmenbr=361
I'm thinking the short and wide, will these work with the 383?
Thanks again.
Joe
http://www.jegs.com/cgi-bin/ncommerc...74&prmenbr=361
I'm thinking the short and wide, will these work with the 383?
Thanks again.
Joe
