Please help identify GM transmission

Posted by John IL on September 15, 2002 at 22:19:26 from (12.84.14.5):

Hello:
I am trying to identify a truck transmission used in a homemade tractor. This tractor has a Wisconsin V4 so I don't know what type of engine was originally in front of it. It appears to be a GM truck transmission of some type. There is a "GM" and "590474" cast on the left hand side. It is a toploader and has a PTO on the left hand side. There is no PTO cover on the right hand side. The gear shift lever is shorter than one would expect to see ( about 15-20" long or so)on a truck and has two bends in it. It also has a weird lever near the shift knob with a heavy wire rod that goes through the top cover of the transmission. Must be a reverse lockout or something? The PTO has six bolts and the topcover has six bolts also. The right hand side has a rounded bulge at the bottom similar to an SM420 , but it doesn't look like an SM420. It does not have a backup light switch and I cannot see any place for a speedo cable to connect to , but there are some bolts/plugs on the tailshaft housing that could have been installed in place of a speedo cable drive. The tailshaft housing is very short. Has anyone seen anything like this before?

Follow Ups:

• Re: Please help identify GM transmission Rick 10:39:00 10/24/06 (0)
• Re: Please help identify GM transmission 46 farmall 21:07:59 09/16/02 (0)

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