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Transmissions and Rear Ends Three on the tree or four in the floor? Shift it all here. |
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#31
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Re: 3 on the tree
[QUOTE=raycow;49507]If you get an SM420 transmission (used 67 and earlier) it will bolt to your present bellhousing with no modifications needed. You will need to replace the driveshaft, and, of course, cut a hole for the shift tower.
If you get an SM465 (used 68-up), you will also need to have the bellhousing center hole bored out to approximately 5.125" to accept the front bearing retainer. This is a job any machine shop should be able to do. Ray Do I need a new clutch or tailshaft? Are the splines the same? |
#32
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Re: 3 on the tree
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Not sure what you mean by tailshaft. If you are talking about the transmission output shaft, you won't need to do anything to that. It should have a flange or yoke on it that the front U-joint bolts to. You WILL need to replace the driveshaft, though. The 3 speed and 4 speed driveshafts are entirely different. Ray |
#33
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Re: 3 on the tree
Since the transmission is -shorter- wouldn't he have to lengthen the driveshaft?
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-- - David R Leifheit in Dallas, Oregon mailto: To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. (2) 1961 1500 1962 1000 1963 2500 1963 4000 1964 2500 |
#34
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Re: 3 on the tree
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Would you cringe if I told you it spent at least a year, maybe two, just sitting out in the yard... coupled to the motor... but in the weeds. I only brought it into the cover after I gave the motor to a scrapper. I refused to part with the transmission.
__________________
-- - David R Leifheit in Dallas, Oregon mailto: To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. (2) 1961 1500 1962 1000 1963 2500 1963 4000 1964 2500 |
#35
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Re: 3 on the tree
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I know that on my first truck, the butcher job done to move the three-speed to the floor would have remained a nasty hole if I hadn't replaced the cover.
__________________
-- - David R Leifheit in Dallas, Oregon mailto: To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. (2) 1961 1500 1962 1000 1963 2500 1963 4000 1964 2500 |
#36
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Re: 3 on the tree
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Ray Last edited by raycow; July 26th, 2013 at 03:20 AM. |
#37
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Re: 3 on the tree
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When I said valuable, I meant scarce. You might have to look for a long time before you find another T-85/T-89 with overdrive. If you do intend to use it, you might want to start looking now for a GM pattern case. That won't be easy to find either. Ray Last edited by raycow; July 26th, 2013 at 03:21 AM. |
#38
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Re: 3 on the tree
Hey guys, one of those overdrives on ebay is gone already, and I can hear the clock ticking on the other one. Going, going.......
http://www.ebay.com/itm/Manual-3-spe...34daec&vxp=mtr Ray |
#39
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Re: 3 on the tree
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#40
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Re: 3 on the tree
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http://www.6066gmcguy.org/SM420.htm Lacking the pics, a quick and dirty way to tell the SM465 and SM420 apart is that the 465 has two PTO covers and the 420 has only one, on the left side. The 420 also has a very significant "bulge" on the right side of the case. Ray |
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