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TKO 600 driveline vibration followup

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JeffN

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Discussion starter · #1 ·
A couple months ago I had a thread going where I was discussing the driveline vibrations after a TKO600 install in my 1970 El Camino. It was converted from an auto to the manual by a professional shop here in So Cal. I tried a number of things to eliminate the vibrations, one of which helped, however I still have some vibrations. Well guess what? I was under the car tonight and was looking very closely with my light at the transmission. It is hard up against the tunnel hump that came with the kit! The installer didn't leave any space for movement! I can see how the friction between the transmission and the tunnel hump has worn down the lip on the top plate. I'm sure the vibration I am hearing is being transmitted directly to the floor pan/tunnel hump. Seems likely doesn't it, or am I off base? The hump will have to come off and some space hammered in. This really angers me that the installation company was that careless, and now is costing me hours of work ripping out my interior to get to the hump. :mad:
 
#2 ·
Mine was pretty snug even with the CC5S hump patch. When installed, only had a fraction of an inch between some corners of trans top plates. I just took a long punch and pounded the patch upwards with a big hammer. Worked for me!
 
#4 ·
i have been chasing a vibration, or rumble, at around 65-70 mph, with my 4l80e trans, and like you, i think its where an area might be rubbing the floor-its not consistant with tire rotation or anything, just every couple seconds you here it-gonna wedge my pry bar up there and adjust it, should cure it
 
Discussion starter · #5 ·
Hi Guys. Thanks for the replys. I layed under the car last night with my hammer and long punch but couldn't really get much leverage to punch up some space. I could use my pry bar but I would be prying against the trans--not sure if I want to do that but maybe. Frustrating because it is a lot of work to pull out the seats carpet console, and then the sticky sound deadener in order to get to the hump. Then unscrew that and deal with the seam sealer they used.
 
#6 ·
JeffN said:
A couple months ago I had a thread going where I was discussing the driveline vibrations after a TKO600 install in my 1970 El Camino. It was converted from an auto to the manual by a professional shop here in So Cal. I tried a number of things to eliminate the vibrations, one of which helped, however I still have some vibrations. Well guess what? I was under the car tonight and was looking very closely with my light at the transmission. It is hard up against the tunnel hump that came with the kit! The installer didn't leave any space for movement! I can see how the friction between the transmission and the tunnel hump has worn down the lip on the top plate. I'm sure the vibration I am hearing is being transmitted directly to the floor pan/tunnel hump. Seems likely doesn't it, or am I off base? The hump will have to come off and some space hammered in. This really angers me that the installation company was that careless, and now is costing me hours of work ripping out my interior to get to the hump. :mad:
Click to expand...

Jeff
To gain some clearance you can use a floor jack and piece of 4X4 about 1 foot long and push the floor up. Don't use a hammer on a nice floor. All you need to do is go around the perimeter of the tunnel (on the floor close to the edge of the tunnel) and push the floor up a little at a time. Work your way around a few times checking as you go. Remember to push it up gently and don't put too much pressure on the floor. A friend of mine is a very good body man and has done this on several cars and it works well. The floor should stay there for another 40+ years before you need to do this again. Before doing this check the body mounts to see if they are in good condition. It may be that all that you need are new bushings?

If you can't feel this vibration then it's not a vibration but noise transmission. If you can feel it and hear it I would work on curing what you feel first. Sometimes a noise transmission can make a vibration feel worse than it really is but it also makes it easier to detect and correct.
 
#7 ·
forcd ind said:
i have been chasing a vibration, or rumble, at around 65-70 mph, with my 4l80e trans, and like you, i think its where an area might be rubbing the floor-its not consistant with tire rotation or anything, just every couple seconds you here it-gonna wedge my pry bar up there and adjust it, should cure it
Click to expand...
My car does this as well. I discovered my new exhaust just barely touches a rear trailing arm brace and that is what causes mine. My new exhaust is being re-done again to cure that.

Jeff
 
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Discussion starter · #8 ·
Jim, thanks very much for the suggestion about the floor jack. I will try that. Right now the car is on jack stands because I'm changing the front rotors and brakes (waiting for parts), so I can't really push with the 4x4 while its on stands. I'll do that after it's back on its wheels on the ground. I do know that the body bushings are not in the best shape, and that by replacing them it would raise the body slightly. But I've read so many horror stories about spinning nuts in the cage that I'm afraid to try!
 
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