Above 2k in 5th vibration and high rpm vibration

[FrdMustangCpe]

Ive noticed when im in 5th if i go over 2,000rpm and let off the gas i get some vibration i can feel throughout the car. also it still have the vibration at 3,000+rpm. any suggestions?

 

[rdksek844]

U-joints?

 

[Musclecarfan88]

Ive noticed when im in 5th if i go over 2,000rpm and let off the gas i get some vibration i can feel throughout the car. also it still have the vibration at 3,000+rpm. any suggestions?

I have this too, only it does it when ever i let off the gas or hold it at a certain point, its usually around 40 + mph and only in 4th and 5th gear. could do it in all other gears though, i just dont go those speeds in any other gear unless im wot going for a fun run, and i dont let off hte gas any so im not sure if its just 4th or 5th or not. i got under the car today and noticed the drive shaft has alot of play in it, soo im going to jack the car up and tighten all the bolts and see if that helps. you might check that too.

 

[FrdMustangCpe]

what should i see if i need new u-joints? also, should there be any play at all in the driveshaft?

thanx

 

[rdksek844]

There should be no play up and down or while holding the yokes and trying to turn the driveshaft. Any play you may be feeling rotationally without holding the yokes could be normal if slight. Too much rear grap slop may require attention. It's kind of a judgement call.

 

[FrdMustangCpe]

so if i get the rear wheels off the ground and i go to turn the driveshaft by hand, there should be no play in it...right?

 

[rdksek844]

No, there will be some play due to gear lash, but if you hold the driveshaft flange and try to turn the ds and there is slop either clockwise or up and down, then your ujoints are shot. Do the same at the slip yoke in the front.

 

[GREG91GT]

how long ago did you do the 373 gear swap

 

[FrdMustangCpe]

how long ago did you do the 373 gear swap

i didnt do it....previous owner did it......:damnit:

 

[dastang2]

does it do it when in N and going 0 mph. when revved, if so it could be a bad spark plug or wire

 

[rdksek844]

You first need to find out if it is drivetrain related. if it only does it when driving and not in neutral like dastang2 suggested then you should check out these sites. They are extreemly informative and should help you at least learn how to diagnose the problem.

http://home.hiwaay.net/~ctfrench/Driveline Vibration.htm

http://www.tccoa.com/articles/tranny/transmission/page17.shtml

 

[DMAN302]

thanks very much.

 

[rdksek844]

no problem

 

[rdksek844]

Oh, how do you like the intake you have?