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SM420 on a modern chevy bell housing?? #54375 Tue Jan 03 2006 04:33 AM
Joined: Mar 2005
Posts: 70
D
DASchaefer Offline OP
Wrench Fetcher
Will a modern bellhousing off a chevy 350 work on the SM420 tranny. Was planning on using the clutch, pressure plate and flywheel off the original motor. thought this had been covered before but coulnd find it anywhere on the site, only spent 45 min. looking are these topics searchable????

Re: SM420 on a modern chevy bell housing?? #54376 Tue Jan 03 2006 05:28 AM
Joined: Apr 2002
Posts: 1,574
G
GMCpanel Offline
Shop Shark
Yes, the archive search has always worked for me.

You can get a '60s bellhousing that used the SM420. The standard bellhousing pattern came into use on trucks after the 235 ended production in '62. The SM420 was used until somewhere in the '67-'69 range.


Get a REAL truck, get a GMC! www.oldgmctrucks.com
1954 GMC De Luxe COE
Re: SM420 on a modern chevy bell housing?? #54377 Wed Jan 04 2006 05:13 AM
Joined: Mar 2005
Posts: 70
D
DASchaefer Offline OP
Wrench Fetcher
Call me stupid in advance but were is the archive search located, just spent several min. looking and cant find it, does that mean I have to find a sixties bell housing????

Re: SM420 on a modern chevy bell housing?? #54378 Wed Jan 04 2006 07:01 AM
Joined: Aug 2000
Posts: 346
O
OlBlue Offline
Shop Shark
The only concern with the SM-420 is the bolt holes in the mounting ears.

SM-420 mounting ears

The Chevy V-8 truck bellhousing from '55 up (not including the ones around '62 with the hydraulic clutch) looks like this:

\'55 up truck V8 bellhousing

I ran a '69 350 in my '49 half ton with this bellhousing. I had also used a '54 crossmember which bolts to this bellhousing in the '49 frame.

Notice the upper mounting holes are tapped while the lower ones are drilled to match the SM-420.

I see these bellhousings on ebay frequently listed as Corvette items. Easiest thing to spot is the reinforcing ribs above the upper trans mounting holes.


'38 Chevy 1-1/2 ton
'49 Chevy 1/2 ton
'54 Chevy 6400 2 ton
'55.2 GMC 3/4 ton
'56 GMC 1-ton

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Re: SM420 on a modern chevy bell housing?? #54379 Wed Jan 04 2006 03:44 PM
Joined: Jul 2005
Posts: 2,044
C
carolines truck Offline
Shop Shark
Two center hole sizes for that cast iron bell housing exist, the SM420 is a smaller hole than say the SM465. One is under 5'' dia. the other is over 5''. L6 fits V8's


Jim & Caroline

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