Clutch vibration

[JLewis]

I recently purchased a really nice 98 12 valve extra cab 4x4 5-speed with 55,000 miles. So far I love it, for now I've added a straight pipe, open K&N and a JRE stage 4 fuel plate slid all the way foreward with the AFC housing all the way foreward. Now of course my stock clutch slips like crazy in fourth and fifth gear if I give it full fuel under 2000 RPM's, I expected that. But I'm getting a bad vibration if I floor it around 1500 RPM's in fourth and fifth. It seems to be comming from the clutch area but is hard to tell. At first I thought it was the exhaust hitting the cab somewhere because I can feel it in the floor but I have ruled that out. My question is could the clutch be vibrating that bad? Maybe a broken spring or a broken piece of the clutch disk? The vibration starts at the point where the clutch just starts to slip and goes away as rpm's increase. I plan on getting a south bend clutch soon and hope this is all it is and not a transmission problem. Someone please tell me this is just the clutch dyeing. Thanks!

 

[Sled Puller]

My stocker just flat out quit disengaging, and I found out half the bolts on the pressure plater were broke off or loose.

I don't know if I would run it til it dies, it may do very bad things in there.



be sure to check your input shaft for being bent.

 

[SMorneau]

I have a 96 5-speed with a #11 Plate and a LUK Pro-Gold clutch. I had my transmission replaced last year and I now have a rattling noise at about 1800 RPM.



I certainly would not want to floor my truck at 1500RPM. Since my last transmission did not make this noise, or at least less of it, I am assuming either I have some clutch springs broken or more likely the tolerancing is a little different in the brand new transmission. I mainly hear the noise in 4th gear not really noticable in 5th. The transmission guy that I trust says its the torsional vibration inherent in the engine not to worry.



The only time I really notice this is when I am running it hard from 3rd to 4th. I think maybe a governor kit would keep me from dropping down to the 1800RPM level.