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Re: Sm318 to Sm420 swap in 59GMC
Quote:
Originally Posted by 1project2many
Depending on the three speed, you may find the bottom bolt holes are a problem. Light duty three speeds were bolted to the bellhousing from the rear. Heavy duty three speeds and 4 speeds are different. Upper trans to bellhousing bolts are installed from the rear while the lower bolts are installed from the front, inside the bellhousing. SM318 Should be a light duty transmssion.
Driveshaft may not be the same. Does your transmission currently have a slip yoke or bolt on rear yoke? How about the one you want to install?
If you can find a heavy duty three speed it has different gear ratios in 1 and 2.
1st 3.17
2nd 1.75
3rd 1.00
R 3.76
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Im pretty sure it has a slip joint, I can go crawl under it tonight, Did they make a 3 speed the was synchronized in all 3 gears? I dont mind the 3 on the tree but I hate having to basically stop for 1st gear
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1959 GMC 100 3 on the tree 270.
1968 GMC k2500 Stepside
1972 Chevy Monte Carlo Custom.
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