| Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | When clutches fail from gradual wear, they start slipping in top gear first, largest torque load, no gear reduction as in lower gears, so if not slipping in lower gears, that is a big clue.
Chattering, jerking, etc., may also occur, but other causes such as worn linkeage, oil soaking, failed springs contribute.
I got a DD 4-53T that we couldn't figure out why it was failed. Turned out every clutch disc spring was broken, too much labor $ to R and R in factory truck.
Ed
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
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