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Worked on the GMC again today,pulled the control valve off took it apart and checked everything again,bright and shiny,all plungers/valves/springs in their correct places. I pressure tested all the ports within the trans with clean air,everything worked as it should,bands,clutch packs...

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Yep,completely disassembled and cleaned every moving part and ensured it had free movement within it's respective port.

Well,I am back to square one here, The replacment trans still will not shift up beyond 2nd gear,and requires it to be at just about governed speed to do so,this is after I have.... Cleaned the control valve,governer,trans pan,flushed the entire trans twice till the oil came out clean,then...

Digging up an old thread again.... I'm still working on this M211 trans,turns out the 3/4 clutch pack was toast in it. Today I finally finished installing a replacment trans(another 302M,donated from another truck) it tested well within suggested pressure limits,Now it shifts 1-3 with...

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Ok,I have let this thread go too long with NO UPDATE!!! Here goes, Well,after several cleaning sessions and more than 4 fluid changes and reading the 8024 and 8025 several times,I now have the trans shifting 1 to 2 consistently in both LOW and HIGH ranges. But after some testing It appears the...

Update.... Been working on the trans in the M211 off and on lately,finally got to spend an entire day on it with the manual. So far here is where i'm at... All linkages checked and adjusted properly Governer is working and allowing Max engine speed Checked and adjusted the front band Did...

OK,I drained and flushed the trans system again and put Dextron III in it this time. Took it out for a spin and after a short drive I tried HIGH range again,IT WORKED!!!,I guess it is still kinda sludgy inside,so I guess I need to flush out the trans several more times to get it working...

UPDATE!! Well,I finally got around to working on this GMC trans some more,according to the manual the linkages are adjusted correctly,And I pulled the trans pan off(heavy sucker!) to find the pickup screen gummed up and about 1/2 inch of sludge in the bottom!! Needless to say I drained the...

Ok Folks,I'm kinda new in this aera so bear with me, I just pruchased a XM 211 that I now have running,BUT It only has foward and reverse in LOW range,an it does not want to shift up in LOW either just stays in First. When it is put in HIGH range it seems to go in gear( the engine stalls down...