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#80621 07/30/2007 7:36 AM | Joined: Apr 2007 Posts: 36 Wrench Fetcher | | Wrench Fetcher Joined: Apr 2007 Posts: 36 | i have a 1957 gmc truck with the origional dual range hydromatic. it slips. I also have a good 1960 dual range hydromatic. do they interchange or what.who rebuilds the old dual range hydros? | | |
#80622 07/30/2007 7:58 AM | Joined: Oct 2001 Posts: 3,458 Extreme Gabster | | Extreme Gabster Joined: Oct 2001 Posts: 3,458 | There are some threads over at www.oldgmctrucks.org about GMC hydramatics. I believe they do interchange, but you should double check.
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A lone amateur built the Ark. A large group of professionals built the Titanic. | | |
#80623 07/30/2007 4:27 PM | Joined: Feb 2004 Posts: 29,836 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,836 | I grew up around a shop where we rebuilt untold numbers of Dual Range transmissions. Most of them are pretty interchangeable, with the only major differences being the bellhousing bolt pattern, output housing, etc. If your transmissions are both out of GMC trucks with similar engines, they should swap with no problems. Even the ones used behind the Pontiac V-8's should fit the 6-cylinder engine with just a bellhousing change.
Good luck on finding an experienced rebuilder, as it's been over 40 years since they were in general use. The dual range isn't that hard to build, but it does require a few dedicated disassembly tools. There's a BIG servo return spring in there that must be handled carefully if you don't want it to launch across the shop!
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
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#80624 07/31/2007 12:40 AM | Joined: Aug 2001 Posts: 1,300 'Bolter | | 'Bolter Joined: Aug 2001 Posts: 1,300 | go to www.areds.com snag the 800 phone number and talk to Leon. He should be able to tell you whatever you may want to know about that trans. | | |
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