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Old 11-14-2003, 05:14 PM   #1 (permalink)
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Oddball SM420

I just came across a free tranny. It appears to be a SM 420 in every way except that the output is 35 spline and the input is ten spline but much bigger than a regular 420. The case and all internals appear to be standard 420. Has anyone ever seen one of these. I am thinking it is some kind of millitary version or something. It is not quite complete but it is brand new.
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Old 11-14-2003, 09:11 PM   #2 (permalink)
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I think there where three main differences through the year but after those there were also different combos. 2wd and 4wd. The 2wd yoke could have had the high spline count.
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Old 11-14-2003, 09:33 PM   #3 (permalink)
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check here
http://www.novak-adapt.com/knowledge/sm420.htm
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Last edited by Brad; 11-14-2003 at 09:34 PM.
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Old 11-15-2003, 12:44 AM   #4 (permalink)
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I believe some 420's came with a 1 1/4" - 10 spline input shaft which is a bit bigger than the normal 1/ 1/8" - 10 spline. Something like that anyways.
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Old 11-15-2003, 07:46 AM   #5 (permalink)
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This input is more like 1 1/2 just the pilot bushing id is 1". I have checked Novaks site and even called and talked to someone. He thought is was probably military but was not sure.
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Old 11-15-2003, 05:48 PM   #6 (permalink)
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it is more than likely to be out of a 2 ton or larger truck. they had the larger input shaft in the ones that I have seen.
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