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| | | | Joined: May 2010 Posts: 132 Wrench Fetcher | | Wrench Fetcher Joined: May 2010 Posts: 132 | I have an open driveline rear end gears. 1956, I think, It feels low, like 3,9 or 4,10 gears, but can I make it positraction? Or must I replace the entire rear end. I kind of like to stick with the 6 lugs wheels, and drum brakes are ok. then I dont need to change the front to match. | | | | | Joined: Feb 2004 Posts: 29,875 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,875 | I don't think there's a limited slip (positraction) carrier assembly available for the 1956 OEM truck rear end. Some of the later-model trucks had 6 lug wheels and posi rear ends, but that would require an axle swap. Try to find a GMC Dana/Spicer rear end- - - -lots of aftermarket parts and gear ratios available for that axle.
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!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | There was a Posi option for the HO33 differential, it was offered from '60-'62, possibly some '63a might have used it too, as the code is listed for '63. They are very rare, though. So far, in the almost 20 years I've looked for one, I've only come across 2 of them. One wasn't for same after I noticed the Posi tag (seller changed his mind), the other was just the carrier NOS that I found on Ebay. I don't believe the carriers will directly swap in the 3rd members, some of the internal parts have different numbers. The entire 3rd member will swap out, though.
Given the rarity of the oem Eaton Posi for that axle, llus the rarity of the Spicer Posi used in '59, the best bet if you really want one would be to do what Jerry suggests and find a later model 6 lug axle.
Bill Burmeister
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