Click on image for the lowdown. 
====
| | | Forums66 Topics128,066 Posts1,055,874 Members48,428 | | Most Online14,466
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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Aug 2008 Posts: 9 New Guy | | New Guy Joined: Aug 2008 Posts: 9 | am i correct in assuming most mechanical parts from a 40 series 58 chevy truck will fit a 57 350 gmc? Thank you Guy | | | | | Joined: Feb 2006 Posts: 1,867 Shop Shark | | Shop Shark Joined: Feb 2006 Posts: 1,867 | It really depends. If the engines and trannys are the same, yes. A lot of parts are shared, but overall GMC made a far heavier duty truck. The larger the truck, the more differences you'll find.
What parts in particular are you thinking?
Jeff | | | | | Joined: Aug 2008 Posts: 9 New Guy | | New Guy Joined: Aug 2008 Posts: 9 | I know the gmc has a 347 pontiac v8, but the 4 spd trans won,t stasy in second. So I,m hoping the chevy 4 spd will work. also the 2spd rearend in the gmc doesn,t work. Lots of little stuff. i USE THE GMC EVERYDAY IN MY CONSTRUCTION BUSINESS, IT HAS 42968 MILES ON IT AND I REALLY WANT TO KEEP IT LOOKING AND RUNNING WELL. i can purchase the chevy 40 series with v8 for $500.oo and figured it would be a good donor. thanx guy | | | | | Joined: Oct 2003 Posts: 5,152 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Oct 2003 Posts: 5,152 | Both transmissions are probably the same SM420 and easily interchangeable. The rear might be an easy swap, but may not and really the only way to know is to compare how they mount.
1955 1st GMC Suburban | 1954 GMC 250 trailer puller project | 1954 GMC 250 Hydra-Matic | 1954 Chevy 3100 . 1947 Chevy COE | and more...
It's true. I really don't do anything but browse the Internet looking for trouble... | | | | | Joined: Dec 2003 Posts: 2,733 Shop Shark | | Shop Shark Joined: Dec 2003 Posts: 2,733 | If your transmission won't saty in gear it may be bad syncronizers. It isn't difficult to overhaul the SM420 or CH465, it's newer replacement. | | | | | Joined: Feb 2006 Posts: 1,867 Shop Shark | | Shop Shark Joined: Feb 2006 Posts: 1,867 | Dave, whats the 'CH' stand for? I thought the 465s were a Synchro-mesh also??? | | | | | Joined: Aug 2008 Posts: 9 New Guy | | New Guy Joined: Aug 2008 Posts: 9 | thanx guys. another thought i've had is to put the 283 from the chevy in thisv truck. it is tough finding parts for the pontiac engine. can you recommend any suppliers of parts for the pontiac? i need starter, generator and waterpump.It is currently like a ride a six flags to drive. I really want to keep it on the road as it is rust free and straight> guy | | | | | Joined: May 2005 Posts: 8,878 . | | . Joined: May 2005 Posts: 8,878 | Ask Mike B about the water pump, he had an adventure with his last year about this time. And I think he has also found a spare. Grigg | | | | | Joined: Dec 2003 Posts: 2,733 Shop Shark | | Shop Shark Joined: Dec 2003 Posts: 2,733 | Plenty of Poncho parts around. Just search the internet or go to www.Kanter.com. | | |
|
|
