Transmission Damper

[spry]

As I have been troubleshooting my mysterious driveline vibration, I have been wondering if I need a transmission damper (5174632AA)? I'm not exactly sure how the damper installs, but would it work with a custom driveshaft (5" aluminum)? Does anyone have pictures of theirs? I'm going to have the driveshaft rebalanced, install the damper, and will be ready to :burnout: again.

 

[spry]

And for the record, my transmission doesn't have the "ears" like the one in this thread, do I need a different tailhousing? http://www.vtcoa.com/forums/f7/what%B4s-3-screws-trans-30471/index3.html

 

[VENOMOUS1 RACING]

Are you stock height or lowered? You should start out measuring pinion angle bud and see if it needs shimming up or down. That's the cause of most vibrations.

 

[spry]

It's lowered 2/5. The first step I took was shimming (4 degree), but it didn't help the vibrations. Scott, are you running any sort of damper on your single piece?

 

[VENOMOUS1 RACING]

It's lowered 2/5. The first step I took was shimming (4 degree), but it didn't help the vibrations. Scott, are you running any sort of damper on your single piece?

No sir no damper. I forget what years came with that damper but seems to me it couldn't help much with the way it's designed. Was that 4* shim what measuring the angles gave you for a correction factor?

 

[spry]

I did my own measurements, and came up with a 4* shim. Quoting from another thread

"I am currently at (in Degrees): Front 4.5 down, Rear 4 Down, Driveshaft 1 Down. Therefore, by my calculations, my angle at rest is .5 Down.

My vibrations seem to happen on the highway, especially when passing other cars. I believe this has something to do with my angle at cruise throttle. According to the article, the angle changes around 2 Degrees when cruising. Therefore, my angle at cruise throttle is 1.5 Degrees up."

http://www.vtcoa.com/forums/f8/axle-shim-measurement-59116/




Maybe I need to throw in 2* shims, and see what happens.

 

[VENOMOUS1 RACING]

I did my own measurements, and came up with a 4* shim. Quoting from another thread

"I am currently at (in Degrees): Front 4.5 down, Rear 4 Down, Driveshaft 1 Down. Therefore, by my calculations, my angle at rest is .5 Down.

My vibrations seem to happen on the highway, especially when passing other cars. I believe this has something to do with my angle at cruise throttle. According to the article, the angle changes around 2 Degrees when cruising. Therefore, my angle at cruise throttle is 1.5 Degrees up."

http://www.vtcoa.com/forums/f8/axle-shim-measurement-59116/




Maybe I need to throw in 2* shims, and see what happens.

4 definitely sounds like too much. I bet the 2* will be the key.

 

[JTS VENOM PERFORMANCE]

you don't need the dampner, your axle is twisiting at hwy speeds just enough to throw off the angle, change it 1-2 degrees you should be fine, first just try removing the spare tire, and try, that will tell you a lot, driveshaft will be fine or you may check your center support bearing, if its worn then your angle will go out also at speed, what you have is torsional , not necessarily rotational

 

[spry]

I originally went with the 4* shim because I thought that .5* off from a regular cruise throttle angle wasn't enough (thought I'd have more spring wrap). I've heard that an angle too close to 0 can cause vibration, but I'm going to play with shim angles until I see a difference. Thanks for the spare tire idea, I've driven with it in and out, but haven't really paid attention to the difference it makes. Considering you're two vendors I trust, a damper is not in my future. Thanks, gents.