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| | | Joined: Dec 2001 Posts: 24 Member | | Member Joined: Dec 2001 Posts: 24 | Hi new here. looking to find info on the tranny and rearend that someone has put in my 52 GMC. the numbers on the tranny are con5 then under that 10J231 under that GM under that 591907. It is behind a '58 235. They have changed the rearend trying to figure the gear ratio by turning the wheel the driveline turns 3 7/8 with to full turns of the rear wheel.
thank you. :confused: | | | | | Joined: Mar 2001 Posts: 316 Member | | Member Joined: Mar 2001 Posts: 316 | Sounds like your trans is an SM-420. Reverse is to the left and back towards the seat, right? Rear axle sounds like 3.90 gears. You did block the wheel that wasn't being rotated while counting ? This could throw you off on your count if it's an open differential.
*** GMC ***
| | | | | Joined: Dec 2001 Posts: 24 Member | | Member Joined: Dec 2001 Posts: 24 | yes reverse is where you said. what gears are in the tranny and is there anyway to find out the year? yes one tire was blocked.
thanks | | | | | Joined: Jan 2001 Posts: 20 Member | | Member Joined: Jan 2001 Posts: 20 | 52GMC welcome aboard Mick Inniss here. I just live outside of Astoria, hell where neighbors!!! good to see some local Guy's around!!! Ever need any help let me know I also got lots of parts if you run into trouble see ya Mick Inniss  | | | | | Joined: Feb 2001 Posts: 92 Wrench Fetcher | | Wrench Fetcher Joined: Feb 2001 Posts: 92 | Hey, Check out http://www.off-road.com/jeep/tech/convtrans/gm/gmsm420id.html I had all the same questions that you do and the folks at stovebolt have helped me immensely! Now maybe I can start helping a little. Anyway, the gear ratios and some good info on the Muncie SM-420 are at the site I listed above. Good Luck, Tom
Whats down in the well comes up in the bucket, so watch who's KoolAid you drink.
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