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RE: Hydramatic the caddy pump has less vanes not enough flow for a 135 the trany had many variants and applications

steve a proper trany that is tired from high miles will need a front pump bands clutches and seals ihave redone one trany three times 116k total miles then it was all junk low mile broken tranys are usualy from abuse they dont like shifting ranges or into rev when moving bad things happen

karl the tm p164 lists your problem and cause read k your rear band was most likly misadjusted classic high range cold slip drop the pan replace rear servo adjust band flush trany band or clutch filings will kill front pump if this is a me rebuild they very greatly in quality

gummed up gov and or valve body change the oil

I have owned hundreds of GMC deuces, have rebuilt many transmissions and am currently using several trucks. Transmission failure issues seem to be a regular topic. I have found that how you operate the transmission and diagnosis of symptoms are critical. Driving, the transmission prefers foot...