Trans ID help Please - The 1947 - Present Chevrolet & GMC Truck Message Board Network

rockguy · 04-27-2004, 01:58 PM

Could someone help ? I have a 4spd. w/ granny out of my 69 1 ton its marked GM on the top and the side . Did GM manufacture the trans or who else would have. Also ther is this number on the top3901131 and on the side 3901127. Thanks

1969 GMC · 04-27-2004, 05:39 PM

it could be one of 3 trannies.
the SM420 (not likely), SM465 (most likely), or NP435 (not likely but possible).

reverse is to the driver side and down on the 420. reverse is to the passenger side and down on the 465. also, the 420 only has one PTO cover, the 465 has two. both of these trannies were made by GM.

the 435 is kinda rare in GM trucks, but they do pop up from time to time. i believe they have reverse to the passenger side and down like the 465, but i'm not sure on that. I do know that the top cover of the 435 is made of aluminum, vs cast iron on the 420 or 465. the 435 was made by New Process gear.

**kwmech** · 04-27-2004, 11:18 PM

Excellent answer----

rockguy · 04-28-2004, 12:56 PM

Thanks 1969 GMC ,I must have the 465 it has two PTO plates . Just another bit of great assistance from this board

styxnstones · 10-03-2004, 02:14 PM

http://www.novak-adapt.com/knowledge...on_gateway.htm

04-27-2004, 01:58 PM	#1
rockguy Registered User Join Date: Mar 2003 Location: Crystal Beach Florida Posts: 76	Trans ID help Please Could someone help ? I have a 4spd. w/ granny out of my 69 1 ton its marked GM on the top and the side . Did GM manufacture the trans or who else would have. Also ther is this number on the top3901131 and on the side 3901127. Thanks __________________ 69 c-30 dually flat bed & dump ( best truck ive owned 87 chevy dually 97 1500 classic 89 wellcraft

04-27-2004, 05:39 PM	#2
1969 GMC Registered User Join Date: Feb 2003 Location: The Rubber City Posts: 5,498	it could be one of 3 trannies. the SM420 (not likely), SM465 (most likely), or NP435 (not likely but possible). reverse is to the driver side and down on the 420. reverse is to the passenger side and down on the 465. also, the 420 only has one PTO cover, the 465 has two. both of these trannies were made by GM. the 435 is kinda rare in GM trucks, but they do pop up from time to time. i believe they have reverse to the passenger side and down like the 465, but i'm not sure on that. I do know that the top cover of the 435 is made of aluminum, vs cast iron on the 420 or 465. the 435 was made by New Process gear. __________________ 1969 GMC K2500 1996 Honda Accord 2007 Kawasaki KLR 650

04-28-2004, 12:56 PM	#4
rockguy Registered User Join Date: Mar 2003 Location: Crystal Beach Florida Posts: 76	Trans Id Thanks 1969 GMC ,I must have the 465 it has two PTO plates . Just another bit of great assistance from this board __________________ 69 c-30 dually flat bed & dump ( best truck ive owned 87 chevy dually 97 1500 classic 89 wellcraft

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04-27-2004, 11:18 PM	#3
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,630	Excellent answer----

10-03-2004, 02:14 PM	#5
styxnstones Registered User Join Date: Dec 2003 Location: CA Posts: 2	http://www.novak-adapt.com/knowledge...on_gateway.htm



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