bogdan

My GT makes an irritating thing in traffic, when I get a clunk in the drivetrain ( gearbox in 1st or 2nd gear) at very low speed, on and off the gas pedal. If I let it roll at idle in first gear the transmission shakes the whole car back and forward. I supose somewhere is a lot of play, but don't know where to look first, engine/ gearbox mounts, clutch... Any thoughts?

blitz928

I'd go with trans mounts, I had a thunk while changing gears on my automatic and that cured it. How many miles on your car?

jeff spahn

I may have the same problem. I 'll have to look at the trans mounts on my automatic as well. I have 115,000 on mine

bogdan

My transmission mounts are new, the clutch kit is new and the TT bearings new. Maybe worn out engine mounts? Car has 77000 miles.

AO

I'd check the trans bolts and rear suspension bolts to make sure they aren't loose. You might also check the half-shaft bolts as they have a history of backing out.


If that doesn't solve the issue, check the rear drive shaft coupler.

Black Sea RD

Sounds like the whole drive train was removed and re-installed, so every fastener is suspect at this time.

This doesn't sound like bad motor mounts but they should be checked anyway to see how bad they are.

As others have already suggested check all the fasteners.

Get the car on the lift and starting from the front and using a torque wrench set to the correct torque for each different fastener, check the bolts that hold the TT to the front bell-housing. If the bell housing was removed check those bolts too. Then check the coupler that holds the short shaft to the drive shaft.

Next check the TT to transmission mounting bolts and the rear drive shaft to transmission input shaft coupler bolt. Then check the transmission mount bolts.

Next check every bolt that holds the rear suspension to the body. While there also check all the half shaft bolts.

HTH,

jeff spahn

Boy is this going to suck with no lift. At least I have a good creeper and 24" jackstands. Already know the half shaft bolts, and rear suspension bolts aren't loose. Just re did the half shafts two weeks ago and the noise didnt go away. Didn't go away when replaced all the shocks and springs. So that leaves me with the trans mounts and rear coupler. If this solves it I'll post what I touched and this may help the OP.

GlenL

Manual transmission?

Put it in gear, lift one rear wheel and turn it back and forth. Is there a lot of play or clunking?

These cars tend to have a lot of back-and-forth jerkiness because the long, thin driveshaft acts like a spring.

Could be a lot of things. Dig in!

bogdan

I remember I had the same problem on my 924. Replaced everything but the jerkiness remained the same...

GlenL

The 924 has the same long driveshaft.

My 944 has some jerkiness but is better after improving engine performance. Strangely enough it was having the fuel injectors cleaned that gave the best improvement. Like the engine ran better at low throttle and jerked on the driveshaft a lot less.

khalloudy

Check for worn axles, that was the problem with my automatic.

dr bob

I used to get this in my first 911 (yes, I did actually own a few of them...). Cure for driveline jerkiness was new plugs. Clutches lasted a LOT longer when there were fresh plugs in the car.

smiffypr

Are your wheels done up tight?

Smiffy

bogdan

Interesting observation with the engine tune up...Now I suspect I have a problem here, because my engine doesn't idle as a V8 should sometimes and on many ocassions it refuses to start on first attempt when warm (cold it fires up perfectly).