'89 k5

[Mule man]

I just bought an '85 K 10 with a NP 465 tranny and a 350 engine. The clutch is too stiff and you have to push the pedal through the carpet to get it to release. I called the previous owner and he said the engine/bell housing was out of an 89 K5. I know most parts specify 85-87 year models and then up. I think the geometry is wrong with the current parts. Does anybody know what parts will interchange between an 85 and an 89? I think all that would be involved would be the master cylinder, slave cylinder, clutch fork. fork pivot ball, throwout bearing, clutch/pressure plate. I am having problems finding interchangeability between years. Thanks for any help you can give.

 

[Z71paramedic]

try to see if the fork has a crack in it. Mine was and I just picked up a new one from Napa. Not sure about the interchangeability though. Was the 85 a hydro setup also? If not the clutch/flywheel could be different I suppose

 

[nvrenuf]

For 85-91 square body trucks, all the clutch parts are interchangable.


Edit: 88+ new body style trucks also used hydraulic clutches but the slave is on the pass side. if your slave is on the driver side you have the correct parts.

 

[Mule man]

Thanks for the replies. I just looked up all the parts and they are all the same. I have replaced all the above parts. It is way too hard to push on the clutch. I have an 85 3/4 ton with the hydro clutch and it's maybe 1/4th the effort to push. It also releases a couple inchers off the floor. The previous owner had shimmed the master cylinder rod with a 3/16 socket to make it longer so that it would release. Any ideas?

 

[nvrenuf]

Maybe check the pedal assy to make sire its correct, there should not be any need for a shim.

 

[Z71paramedic]

I agree. Sounds to me like something's binding. And with you saying you just replaced everything else I'd look more into the pedal assembly.