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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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#64255 08/11/2006 8:09 PM | Joined: Feb 2006 Posts: 117 Wrench Fetcher | | Wrench Fetcher Joined: Feb 2006 Posts: 117 | My '57 310 originally came with an SM420 in it. When I got the truck, it was loooong gone. i plan to replace the SM420 now and am wondering if the "later" models are interchangeable. In other words, I found one out of a '66 and it is in decent shape. Will SM420's from that late of a model bolt up into my '57? Also looking for specs on drivelines. I have a stock 265, SM420 and stock rear.... Thanks-Dan 
my truck gets better every day...every PAYDAY | | |
#64256 08/11/2006 8:34 PM | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | It seems to me that ought to bolt right in. There was some variation in the size of the front brg. retainer where it goes into the bell houseing. Now would be a good time to think about a T-5 o,drive.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | |
#64257 08/11/2006 9:15 PM | Joined: Feb 2006 Posts: 117 Wrench Fetcher | | Wrench Fetcher Joined: Feb 2006 Posts: 117 | I was kind of wanting to keep the drivetrain stock. If I deviate from that, then I would throw in a radically built 350 w/fuel injection, 700R4 and throw in a Ferd 9" or something out of a 70's mid size car with posi. Thanks for the info. I think I will try to work the SM420 into the truck and see what happens  Dano
my truck gets better every day...every PAYDAY | | |
#64258 08/11/2006 9:18 PM | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | I don't think that the front retainer size was changed until the 465 came out in '67. The 420 should fit right in. The only concern I would have is the output yoke, it might be different. But you should be able to swap them if necessary without too much trouble.
Bill Burmeister
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#64259 11/20/2006 4:32 AM | Joined: Nov 2006 Posts: 61 Member | | Member Joined: Nov 2006 Posts: 61 | Say can you tell me what a c242 transmission is? Thanks in advance.
Slider
Jesus is Love! Never forget the Veteran.
AND God bless Amercia!
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