I have a 1973 F-250 with a 4 speed manual transmission. Just had the engine rebuilt by a shop. All is well except the clutch is grabby. I noticed it seems worse when its warmed up Had it checked by the same shop and he sees no problem. I have Taken the flywheel cover off Inspected the clutch and don't see any oil on the clutch. I have sprayed Brake cleaner on Clutch and seems to help some for a short time but then comes back. What are my options? Replace Clutch and resurface flywheel? Try to exhaust all options before I spend the $$ on a new clutch

 

You mean clutch "chatter"? Sometimes it's caused by a wonky flywheel, an uneven or warped clutch disc, broken clutch disc springs, or misalignment of the input shaft. Either way, the trans has to come out.

 

Agree... flywheel true/re-surface is recommended with R & I of transmission and clutch. Also check/correct runnout with offset dowels. Runnout check is especially important if the block was line bored/honed and/or block and transmission/clutch housing are not factory matched.

 

Don't overlook bad motor mounts and sloppy clutch linkage.

 

But why does it do it worse warmed up good than when its cold? The clutch chatter? If it were a bad mount it would do it all the time!