Vibration problems

O.K I have checked the Motor Mounts they seem O.K I replaced the Cab mounts which helped. I balanced the tires helped a little more. But my 65 shakes so much when i get to about 60 that it pops out of 3rd gear! P.S. as long as I hold on to the shifter and go past 60 it will stop. What could it be?

 

check your u joints that could be causing the problem
Dave 59 chevy apache

 

Along with U joints, look at carrier bearing if you are still using a two piece drive shaft. The shifter popping out of gear is usually caused by a syncro starting to go also.

Dennis

 

what's a syncro?

 

[updated:LAST EDITED ON Jun-25-03 AT 09:46 PM (CST)]Sorry. Syncronizer. It's they are inside the trans and keep the gears "syncronized". It was a solution to the old style of transmissions that required a double clutch method to shift gears.

In our trucks that have a granny 4 speed transmission the first gear, compound low, is not syncronized. You cannot get it in first gear unless the truck is stopped. 2 thru 4 are fully syncronized that allows normal shifts.

Dennis

 

would that be true of the 3 speeds?

 

the vibration sounds like it could be the tranny. maybe one of the gears is bad and the syncro is bad casue that 3rd gear is bad.
cowboy

 

>would that be true of the 3 speeds?

The three speed is fully syncronized. Popping out of gear is a common symptom of a bad syncronizer. Is this a column shift? Popping out could also be related to a linkage adjust problem. BUT, since you have a vibration, I suspect the trans, or other driveline malfunction.

Dennis

 

Thanks guys! since I don't know anything about transmissions I am going to get someone else to look at it.