Oddball SM420 - Pirate4x4.Com : 4x4 and Off-Road Forum

bobdog · 11-14-2003, 04:14 PM

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.

JeepinDoug · 11-14-2003, 08:11 PM

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.

Brad · 11-14-2003, 08:33 PM

check here
http://www.novak-adapt.com/knowledge/sm420.htm

anthony_harris · 11-14-2003, 11:44 PM

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.

bobdog · 11-15-2003, 06:46 AM

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.

odee · 11-15-2003, 04:48 PM

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.

11-14-2003, 04:14 PM	#1 (permalink)
bobdog Registered User Join Date: Oct 2002 Member # 14364 Location: Salt Lake City Posts: 199	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.

11-14-2003, 08:11 PM	#2 (permalink)
JeepinDoug Registered User Join Date: Jul 2002 Member # 13028 Location: So.S.F., CA Posts: 3,124	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. __________________ I may lack much in way of integrety but I make up for it with pure denial. [URL=http://www.pirate4x4.com/forum/showthread.php?t=377480][B][COLOR="Red"]Malvado Grande #1[/COLOR][/B][/URL]

11-14-2003, 08:33 PM	#3 (permalink)
Brad Registered User Join Date: Feb 2001 Member # 3239 Location: Benicia,CA Posts: 7,444	check here http://www.novak-adapt.com/knowledge/sm420.htm __________________ B-RAD Fabrication TDO DYSFUNCTIONAL ROCKCRAWLERS Last edited by Brad; 11-14-2003 at 08:34 PM.

11-14-2003, 11:44 PM	#4 (permalink)
anthony_harris Registered User Join Date: Nov 2001 Member # 8161 Location: bc, canada Posts: 137	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. __________________ 90 YJ 350 SM420 Dana300 60 14bolt 39.5's

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11-15-2003, 06:46 AM	#5 (permalink)
bobdog Registered User Join Date: Oct 2002 Member # 14364 Location: Salt Lake City Posts: 199	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.

11-15-2003, 04:48 PM	#6 (permalink)
odee Registered User Join Date: Apr 2000 Member # 613 Location: Big Stone Gap, VA., USA Posts: 865	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.