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What V-8 Engines Mates Up To A SM420 Trans??????
#1382521 Wed Oct 28 2020 10:41 AM
Joined: Apr 2005
Posts: 376
M
Shop Shark
As the title says. Thanks for your help!!!

Marv.

Last edited by marvin ribbich; Wed Oct 28 2020 10:42 AM.
Re: What V-8 Engines Mates Up To A SM420 Trans??????
marvin ribbich #1382531 Wed Oct 28 2020 11:58 AM
Joined: Feb 2016
Posts: 440
7
Shop Shark
Any Chevy V8 will bolt up, you need the correct bell housing to match the SM420, mine is the original 283 V8 and SM420, all of the Chevy V8's have the same bolt pattern for the trans/bell housing - even my 2000 K3500 6.5 diesel is the same.

Last edited by 78buckshot; Wed Oct 28 2020 11:59 AM.

1957 Chevrolet 5700 LCF 283 SM420 single speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto
Re: What V-8 Engines Mates Up To A SM420 Trans??????
marvin ribbich #1382540 Wed Oct 28 2020 02:06 PM
Joined: Nov 2005
Posts: 5,825
3
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Master Gabster
Hy marvin ribbich, as 78buckshot has said it is more a matter of having the correct bellhousing to mate any engine to any transmission. In the mid fifties heavier trucks manufactured by Chevrolet and GMC could come equipped with Buick, Chevrolet, Oldsmobile and Pontiac V8 engines As the mounting bolt pattern of the SM420 transmission is shared by many transmissions I would think that there are many non GM engines that could have an SM420 transmission bolted up to them. Hope that helps.

Re: What V-8 Engines Mates Up To A SM420 Trans??????
marvin ribbich #1382545 Wed Oct 28 2020 02:48 PM
Joined: Jun 2011
Posts: 3,773
E
Shop Shark
Also all GM inline 6 cyl. Engines. Some BOP bellhousings come with 420 bolt pattern.

Ed


'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
Re: What V-8 Engines Mates Up To A SM420 Trans??????
78buckshot #1385998 Thu Nov 26 2020 01:32 PM
Joined: Nov 2020
Posts: 4
B
Moderated
Will a 1966 gmc k1000 v6 305e bell housing bolt up to a SBC. Try to convert my v6 to a 350. And add power steering

Re: What V-8 Engines Mates Up To A SM420 Trans??????
marvin ribbich #1386116 Fri Nov 27 2020 01:50 AM
Joined: Feb 2004
Posts: 21,577
H
Boltergeist
No, the V6 bellhousing bolt pattern is different than the V8's. You might have one of the "SAE" style round bell housings on the 350, depending on which transmission you have. There are SAE bellhousings that fit the GM V8's which would adapt them to your transmission, however. Your checkbook is going to need some CPR- - - - -they're scarce and expensive!
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: What V-8 Engines Mates Up To A SM420 Trans??????
Hotrod Lincoln #1386151 Fri Nov 27 2020 12:54 PM
Joined: Nov 2020
Posts: 4
B
Moderated
Thanks I have read various articles both ways saying yes and no. My v 6 bell housing is rounded and has the 11 inch clutch, and the transmission is the SM 420 manual 4 speed. Do you know what SAE bell housing I would need and if I can get that housing would the rest of the drive train bolt up, and can I use my original fly wheel


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