North American Turbocoupe Organization



Driveshaft shake?
MeAndMyT Offline
Senior Member
#1
Hey everyone.. Well the TC has been shaking a little more then normal. When i take off it shakes just a little bit. But when going 70+ mph or WOT in high rpms it shakes pretty bad. Its not like terrible but way more then normal. I just jacked up the car and the weights are still on the driveshaft (there is only two on each side right?) Also shook it around trying to see if the U joints were bad but they dont seem to be. I just replaced a little less then a year ago anyways. So I'm kind of stumped. I'm thinking maybe the flywheel could be loose for some odd reason. I'm going to go check to see if our cars have an inspection plate. Any ideas would be great. Thanks.

Also I checked that the wheel were tight and had correct psi in them. I think the wheels are balanced because if i throw it in neutral going 70 it will not shake.
88 TC 5 spd 22x,xxx miles Ran 15.3 in 1/4.. K&N Cone. Gillis boost controller @ 15. Faze Boost Gauge. A/C belt off. 2 1/2 inch exhaust dumped at axles.
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Robert Camp Offline
Posting Freak
#2
Quote:Originally posted by MeAndMyT:
Also I checked that the wheel were tight and had correct psi in them. I think the wheels are balanced because if i throw it in neutral going 70 it will not shake.
Then it's not likely to be the driveshaft either.
Robert Camp
'86 Medium Regatta Blue TC, 5-speed, original owner.
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87TurboBobby Offline
Senior Member
#3
Before I tore into the flywheel and clutch I would check all the pulleys on the engine, especially the crankshaft and see if any were loose. Then maybe the flywheel or clutch. Just a thought.
Bobby
90 Mustang GT Vert.
95 Mustang Vert
04 F150 Heritage
92 Chevy Silverado
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Pete D Offline
Administrator
#4
See if the trans mount is loose or the bushings(rubber) are shot. Also see if the front of the drive shaft has any play in the tail housing

What about the bolts that hold the driveshaft in back? They can come loose.
Pete Dunham


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TCx2 Offline
Senior Member
#5
If you go to neutral and there is no shake... I wouldn't think it was the drive shaft... as the drive shaft is STILL spinning as long as you are moving.
Kevin
TCx2
67 Green Ford Fairlane 428CJ 5spd
89 Fiji Blue Chrysler Conquest
03 Mercury Marauder "Supercharged"
03 Ford Excursion(King of the SUVs)
04 Mustang Cobra - Screaming Yellow
10 Challenger R/T "Supercharged"
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Ryan H Offline
Posting Freak
#6
Check your motor and transmission mounts... Also check the tailshaft bushing in the transmission. I had this problem twice, my Mustang was motor mounts and my last TC had a bad tailshaft bushing.

If the tailshaft bushing is out, you need to check the driveshaft yoke for damage as well. If you end up replacing the driveshaft yoke, get it re-balanced at the same time.
'88 TC Smile Walbro 255HP, Stinger FMIC, PIT BOV, Pro 5.0, Kirban, RR cam, FRPP strut tower brace, T3
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Jeff K Offline
Administrator
#7
Sounds to me like a worn tailshaft bushing. Easy to replace if you have the correct $120 tool.
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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TurboCoupe50 Offline
Posting Freak
#8
Quote:Originally posted by Jeff K:
Sounds to me like a worn tailshaft bushing. Easy to replace if you have the correct $120 tool.
Or you can you can use a old yoke with two bushings stacked and the outer one cut down to about 3/4 width... Then drive the new one in and let the original "Hang" inside the transmission(this will flare and ruin the first[inner]one on the yoke)... Mine has been this way 5-6 years now... Don't drive it in far enough for the original to drop out of the tail housing, as it will eat up speedo gears... Wanna see my T shirt???
1988 Turbo Coupe331 AOD

1972 Comet GT

1969 Fairlane Cobra 428CJ 4-Speed
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MeAndMyT Offline
Senior Member
#9
Okay now i have to change the story up on you guys. I just took the car for another test run to verify and IT DOES shake when in neutral going 70+ mph. The shake is coming from what seems the FRONT of the driveshaft. I am hoping that maybe the U joint is bad again, because there was just a little tiny play when i was shaking my driveshaft yesterday. More advice would be nice. Thanks alot guys. I might be able to get this baby going before my first semester of college :]
88 TC 5 spd 22x,xxx miles Ran 15.3 in 1/4.. K&N Cone. Gillis boost controller @ 15. Faze Boost Gauge. A/C belt off. 2 1/2 inch exhaust dumped at axles.
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Jeff K Offline
Administrator
#10
As I said above, bad tailshaft bushing.
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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