Maybe this is noob tech, but does a 2.8L have an externally balanced flywheel? I put new clutch in my S10, and now it vibrates like crazy. I was wondering if it had an external balance, and if I could have bolted up the flywheel in the wrong position?

The vibration seems to come from the motor/tranny, and gets worse with RPM. If I push in the clutch at speed, it seems to go away. Any ideas?

Flywheel won't be yer problem. But a crap rebuilt clutch assembly can and will do this. Particularly if the pressure plate was not balanced at the reman place. I never ran into balance problems with new assemblies.

It's a new clutch kit, not reman.

did you clean your flywheel with alcohol before reassembly? A little grease and dirt will mean slippage. By the way, I have a set of roller tip rockers and STD pistons for a GM 2.8 all still new in the box cheap.

There are 2 different balance 2.8L depending on the year. I think the split is 87/88. The newer one is 'neutral balance'.

There are 2 different balance 2.8L depending on the year. I think the split is 87/88. The newer one is 'neutral balance'.Mine is an 86 with a flywheel from an 83. Are you saying that the older ones are externally balanced? And if they are, is it possible to put the flywheel in at the wrong position? I thought I put it in the same way it came out.

Mine is an 86 with a flywheel from an 83. Are you saying that the older ones are externally balanced? And if they are, is it possible to put the flywheel in at the wrong position? I thought I put it in the same way it came out.

1988 and earlier should all be counterweighted flywheels per: http://www.tacreationsusa.com/automatic_transmission.htm

is it possible to put the flywheel in at the wrong position? I thought I put it in the same way it came out.

Appears it is dowled at the crank flange. Should be only one way to install it. Tell u what. Tear the clutch assembly off it and fire it back up and see if the vibration is gone. My guess it will be if yer using a counterweighted flywheel and the engine is not the newer version that requires a zero balance flywheel.:smokin: