Clunk when accelerating
08-04-2010, 12:53 AM
#1
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Car: 1990 Camaro RS
Engine: 355 Vortec TPI LT4 Hotcam
Transmission: TH700-R4
Axle/Gears: 3.23
Clunk when accelerating
The car will always make a clunk noise when accelerating, it happens when the transmission shifts from 2 to 3.
Bad U-joints? Or something else with the transmission or the rest of the drivetrain/ differential?
Bad U-joints? Or something else with the transmission or the rest of the drivetrain/ differential?
08-04-2010, 12:24 PM
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Car: 1992 RS
Engine: Carbed 350
Transmission: 700R4
Axle/Gears: 3.42 posi
Re: Clunk when accelerating
Could also be a motor mount.
Usually a U-Joint will 'clunk' when put into gear. But the mounts 'clunk' as you described on gear shifts. The 2-3 shift is usually the more 'violent' of the shifts - usually higher rpm's on that shift since the 1-2 shift usually happens too quickly (like in the middle of a normal turn) as opposed to the 2-3 shift that's usually always on a straight-away and us Camaro/Firebird folks like to really have our foot in it then
Usually a U-Joint will 'clunk' when put into gear. But the mounts 'clunk' as you described on gear shifts. The 2-3 shift is usually the more 'violent' of the shifts - usually higher rpm's on that shift since the 1-2 shift usually happens too quickly (like in the middle of a normal turn) as opposed to the 2-3 shift that's usually always on a straight-away and us Camaro/Firebird folks like to really have our foot in it then
08-04-2010, 02:42 PM
#5
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Car: 1990 Camaro RS
Engine: 355 Vortec TPI LT4 Hotcam
Transmission: TH700-R4
Axle/Gears: 3.23
Re: Clunk when accelerating
I never thought about the motor mounts, I kinda had thoughts about the u-joints going bad because it does clunk when I put it in gear, put some times its not all that bad.
I guess it wouldn't hurt to get new mounts, the engine doesn't really move that much when I start it up or revv it with the hood open, but who knows.
As for the u-joints, they are still the original ones to the car so it wouldn't hurt to get new ones either.
I guess it wouldn't hurt to get new mounts, the engine doesn't really move that much when I start it up or revv it with the hood open, but who knows.
As for the u-joints, they are still the original ones to the car so it wouldn't hurt to get new ones either.
08-04-2010, 03:03 PM
#6
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Car: 91 Z28,64ImpalaSS4094spd,67 Galaxy
Engine: Dart 415Profiler hd,cmprlrs,Hlly750
Transmission: Built 700R4, 3200 stall
Axle/Gears: 3:89 Moser 9"
Re: Clunk when accelerating
tranny mt, replace w/urethane mt...
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08-04-2010, 07:12 PM
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Car: 1990 Camaro RS
Engine: 355 Vortec TPI LT4 Hotcam
Transmission: TH700-R4
Axle/Gears: 3.23
Re: Clunk when accelerating
Already been replaced.
Brand new one on the car.
Less than a few months old. And I know I didn't bust it, it did it before and after the replacement.
Less than a few months old. And I know I didn't bust it, it did it before and after the replacement.
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