sm465 severe pulsate in reverse

[rphenry250]

hi, ive got a 1983 K5 with a SM465 and NP205 and when i put it in reverse, it shudders horribly then once in a while it wont then next time it will. I just had the clutch redone (including flywheel resurfacing). All other gears are fine, anby ideas as to what this could be?

thanks
RPHenry

 

[guido666]

You could be missing a (couple?) gear teeth. Other than that, it's all gear drive so there should be no way for anything to slip or move (unlike clutched systems).

I'm no brake expert, but I know drum brakes self-adjust when you are going in reverse. Could it have something to do with that?

 

[Blazer1970]

Most likely you have a bad motor mount or tranny mount.

 

[suburban n progress]

one time mine did that so i checked mounts crossmember and everything i could find...and turned out to be my ubolts on my rear axle were loose..tighten them way down and its like all vibrations went away AND felt smoother while going forwards..could be a similar problem..HOpe that helps

 

[79k20350]

its the way your letting the clutch out/ applying the gas, all standards do this if you are a little off... thats why it only happens only sometimes

 

[JonV]

Mine did that. Replaced motor mounts; fine ever since