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ElPasoCOunty · 01-09-2018, 04:34 PM

I've currently got an SM 465 torn apart in my man cave but I can't get the shift shafts out of the top cover to remove the forks. I want to replace the springs and detent balls and check for scoring, etc. 1972 K20 350/SM465/NP205.

Roll pins for both 1-2 and 3-4 shift forks are driven out...Reverse is waiting for everything else to clear out of the way. The GM rebuild manual says to drive them out but I've been wacking on them pretty good and they wont budge.

Has anyone had a problem driving them out?

The transmission is out for a number of reasons. I have had major shifting issues after the truck warms up. 10-12 miles out it won't shift out of 2nd up to 3rd, 3rd to 4th, or back down. Doesn't matter if I'm stopped, engine running or off, I cannot shift from 1st, or 2nd into reverse. Clutch and linkage were fine.

The other problem was that its leaking so bad that it won't pass the TUV, which is our annual inspection here in Germany.

Parts can be hard to come by, most of the time I have a 10-21 day lead time.

Any help would be appreciated.

01-09-2018, 04:34 PM	#1
ElPasoCOunty Registered User Join Date: Jun 2013 Location: Baumholder Posts: 6	SM 465 Shift Fork Removal I've currently got an SM 465 torn apart in my man cave but I can't get the shift shafts out of the top cover to remove the forks. I want to replace the springs and detent balls and check for scoring, etc. 1972 K20 350/SM465/NP205. Roll pins for both 1-2 and 3-4 shift forks are driven out...Reverse is waiting for everything else to clear out of the way. The GM rebuild manual says to drive them out but I've been wacking on them pretty good and they wont budge. Has anyone had a problem driving them out? The transmission is out for a number of reasons. I have had major shifting issues after the truck warms up. 10-12 miles out it won't shift out of 2nd up to 3rd, 3rd to 4th, or back down. Doesn't matter if I'm stopped, engine running or off, I cannot shift from 1st, or 2nd into reverse. Clutch and linkage were fine. The other problem was that its leaking so bad that it won't pass the TUV, which is our annual inspection here in Germany. Parts can be hard to come by, most of the time I have a 10-21 day lead time. Any help would be appreciated. Last edited by ElPasoCOunty; 01-09-2018 at 04:41 PM.