driveshaft vibration

tayzoid1 · 11-06-2008, 10:02 PM

in my old car there is a bad vibration in 5th gear right about 2300rpm and above the faster you go the more violent it gets it only happened after the new t-5 nothing was changed with the drivshaft i have not ckeacked the ujoint but i really dont know what im looking for in the ujoint's should riot(jason) have the driveshaft balanced or just u joints im kinda lost
thanks
taylor

86GTPONY · 11-06-2008, 10:12 PM

Trying to remember - did you just do an auto to 5-speed conversion? Either way, first make sure your driveshaft bolts are tight. Your yokes should be neither stiff, nor sloppy. If all is good there, I can't see an imballanced driveshaft being that violent.

LeeH · 11-06-2008, 10:57 PM

Quote:

Originally Posted by tayzoid1

in my old car there is a bad vibration in 5th gear right about 2300rpm and above the faster you go the more violent it gets it only happened after the new t-5 nothing was changed with the drivshaft i have not ckeacked the ujoint but i really dont know what im looking for in the ujoint's should riot(jason) have the driveshaft balanced or just u joints im kinda lost
thanks
taylor

It could be a pilot bearing problem or the mainshaft has excessive play in it from it either being impropperly shimmed or bad bearings. I know all the T5s I have seen with bearing problems have had major vibration issues in 5th gear.

QWKSNKE · 11-07-2008, 06:37 AM

The balance marks are not lined up. There should be a paint mark on the pinion flange and one on the d/shaft. If you still have a stock d/shaft the marking will be yellow. If you have the FMS aluminum shaft, it will be purple I think. Rotate the shaft until these marks line up

qkjuicedpony · 11-07-2008, 06:50 AM

Quote:

Originally Posted by QWKSNKE

Rotate the shaft

tayzoid1 · 11-07-2008, 09:23 AM

lol at qckjuiced
but ne way no it has always been a 5speed somone told me to rotate the driveshaft 90 degrees util it stops but i havent had the time so i just posted it i will try it today and see if it works and yes lee it has the factory drive shafts but it also has the factory ujoint thats why i thought it could be them but when i am checking the u joints what am i looking for when looking for a bad u joint?

SlowJoe · 11-07-2008, 09:33 AM

on my 87 t-bird i had the same thing going on. pulled the drive shaft a few times and could not tell it had a bad u joint. so i just bought 2 new ones and when i pulled it apart the front u joint had about half the bearings missing in one of the caps. problem fixed.

but if it just started with a trans swap i would look there. is it a v8 5 speed?

tayzoid1 · 11-07-2008, 12:04 PM

yea v8 5spd i have put two other trannies in it that were in alot worsh condition then this one so i dont think it is this one im gonna rotate the shaft and see if that is it then the ujoints and then i guess ill see it is the same transmission that i got from coupe so i dont think it is the tranny i dealt w/ coupe alot and he is a very honest guy so i dont think he sold me abad tranny

EHardy1971 · 11-07-2008, 02:02 PM

Does it still have the dogbone on the rear end?

QWKSNKE · 11-07-2008, 02:09 PM

If the yellow marks are not lined up it will vibrate. The driveshafts mount a certain way to the pinion flange. Crawl under the car and line these marks back up and it will be as good as it is going to get

11-06-2008, 10:02 PM	#1
tayzoid1 5.slo stanger Join Date: Jan 2007 Location: oxford alabama Posts: 735	driveshaft vibration in my old car there is a bad vibration in 5th gear right about 2300rpm and above the faster you go the more violent it gets it only happened after the new t-5 nothing was changed with the drivshaft i have not ckeacked the ujoint but i really dont know what im looking for in the ujoint's should riot(jason) have the driveshaft balanced or just u joints im kinda lost thanks taylor __________________ no mustangs anymore but i do have a 1jz swapped 83 supra

11-06-2008, 10:12 PM	#2
86GTPONY Gone but not forgotten Join Date: May 2008 Location: 4/08/2013. Went to the man upstairs. RIP Posts: 955	Trying to remember - did you just do an auto to 5-speed conversion? Either way, first make sure your driveshaft bolts are tight. Your yokes should be neither stiff, nor sloppy. If all is good there, I can't see an imballanced driveshaft being that violent. __________________ *-Don* 86GT (sleeping in the garage for now) 87 T-bird Turbo Coupe (daily driver) 87 Ranger ($100 work truck) Meat is murder!... Tasty, tasty murder.

11-07-2008, 06:37 AM	#4
QWKSNKE 3v's are slow Join Date: Dec 2004 Location: Here and There Posts: 17,152	The balance marks are not lined up. There should be a paint mark on the pinion flange and one on the d/shaft. If you still have a stock d/shaft the marking will be yellow. If you have the FMS aluminum shaft, it will be purple I think. Rotate the shaft until these marks line up __________________ 2009 Porsche Carrera S 2008 ///AMG C63.. Eurocharge Tune. RIP 2019 AMG GLC43..wife's 03 F250 SD.. Edge Evo, AFE Stage 1 CAI 08 GT. JBA axle back, FRPP springs, FRPP swaybars.. daughter's 01 Cobra vert... wife's I need a new toy

11-07-2008, 09:23 AM	#6
tayzoid1 5.slo stanger Join Date: Jan 2007 Location: oxford alabama Posts: 735	lol at qckjuiced but ne way no it has always been a 5speed somone told me to rotate the driveshaft 90 degrees util it stops but i havent had the time so i just posted it i will try it today and see if it works and yes lee it has the factory drive shafts but it also has the factory ujoint thats why i thought it could be them but when i am checking the u joints what am i looking for when looking for a bad u joint? __________________ no mustangs anymore but i do have a 1jz swapped 83 supra

11-07-2008, 09:33 AM	#7
SlowJoe Mind Blowing Join Date: Jun 2006 Location: Dawsonville Ga Posts: 3,913	on my 87 t-bird i had the same thing going on. pulled the drive shaft a few times and could not tell it had a bad u joint. so i just bought 2 new ones and when i pulled it apart the front u joint had about half the bearings missing in one of the caps. problem fixed. but if it just started with a trans swap i would look there. is it a v8 5 speed? __________________ Slow Joe Racing 2008 dodge ram 5.7 HEMI 1993 lx with a 289 and a 3 speed on the floor WTB 1955 t-bird project

11-07-2008, 12:04 PM	#8
tayzoid1 5.slo stanger Join Date: Jan 2007 Location: oxford alabama Posts: 735	yea v8 5spd i have put two other trannies in it that were in alot worsh condition then this one so i dont think it is this one im gonna rotate the shaft and see if that is it then the ujoints and then i guess ill see it is the same transmission that i got from coupe so i dont think it is the tranny i dealt w/ coupe alot and he is a very honest guy so i dont think he sold me abad tranny __________________ no mustangs anymore but i do have a 1jz swapped 83 supra

11-07-2008, 02:02 PM	#9
EHardy1971 Trunk Monkey Join Date: Jun 2007 Location: Home Posts: 5,708	Does it still have the dogbone on the rear end? __________________ Eric 89 LX Coupe-Juiced 01 Lightning-Boost 06 TBSS

11-07-2008, 02:09 PM	#10
QWKSNKE 3v's are slow Join Date: Dec 2004 Location: Here and There Posts: 17,152	If the yellow marks are not lined up it will vibrate. The driveshafts mount a certain way to the pinion flange. Crawl under the car and line these marks back up and it will be as good as it is going to get __________________ 2009 Porsche Carrera S 2008 ///AMG C63.. Eurocharge Tune. RIP 2019 AMG GLC43..wife's 03 F250 SD.. Edge Evo, AFE Stage 1 CAI 08 GT. JBA axle back, FRPP springs, FRPP swaybars.. daughter's 01 Cobra vert... wife's I need a new toy