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Mod | | | Forums66 Topics128,080 Posts1,055,953 Members48,430 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Dec 2011 Posts: 90 Wrench Fetcher | | Wrench Fetcher Joined: Dec 2011 Posts: 90 | Hey all, Just picked up a new driveline for my 51 1.5 ton. found a screaming deal on a 427 mated to a Eaton 5speed o/d. it has a casting number of 230790 on the side. Just wondered if anyone knows what model number tranny this is. Was told it is a .70 O/d or .75 o/d. It sure did drop the rpm of that big block going into 5th. Also has a weird shift pattern. reverse is all the way to the left and up, straight down is 1st, Up and middle is 2nd, straight down from second is 3rd, to the right and down from third is 4th and straight up from 4th is 5th. 1st is also a granny gear. Any info would be appreciated!
Thanks
Joe | | | | | Joined: Oct 2011 Posts: 172 Wrench Fetcher | | Wrench Fetcher Joined: Oct 2011 Posts: 172 | shift sounds odd from 3rd to 4th and upto 5th ????
live or die do it with spanner in hand
| | | | | Joined: Jan 2008 Posts: 4,961 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,961 | The transmission should have a tag on it. How do you know its an Eaton? It sounds like a Spicer shift pattern to me. A Spicer would be around .80 OD. An Eaton would really be too new to behind a 427. | | | | | Joined: Nov 2005 Posts: 6,100 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 6,100 | Hy lunchbox, I'm with crenwelge on this one, it could be a Spicer 3152, with O.D. the shift pattern changes to the one you describe, hope that helps. | | | | | Joined: Sep 2011 Posts: 1,453 'Bolter | | 'Bolter Joined: Sep 2011 Posts: 1,453 | The weird shirt pattern is an easy way to spot the O.D. from the direct drive spicers.
BC
1960 Chevy C10 driver 261 T5 4.10 dana 44 power loc
1949 GMC 250 project in waiting
1960 C60 pasture art
Retired GM dealer tech. 1980 - 2022
| | | | | Joined: Dec 2011 Posts: 90 Wrench Fetcher | | Wrench Fetcher Joined: Dec 2011 Posts: 90 | hmm, to be honest, i just drove the truck and went on what the guy told me, I'll take a look at the unit in a few mins and take a couple pics / find the ID plate. | | |
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