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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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#10316 03/20/2003 11:05 PM | Joined: Jul 2002 Posts: 188 Member | | Member Joined: Jul 2002 Posts: 188 | My boss is looking at a task force truck (58 GMC) that has the Pontiac engine w/3 speed column shift. He is interested in an auto trans. Obiously the hydramatic will bolt up, and that is certainly an option, but what other trans would work? I read somewhere that the hydramatic was factory matched. What's up with that? | | |
#10317 03/20/2003 11:15 PM | Joined: Feb 2003 Posts: 129 Shop Shark | | Shop Shark Joined: Feb 2003 Posts: 129 | Not a expert, but USA GMC's came from the Factory with different engines than chev's. The 6 Cylinder engine was a 270 and the V8 was a pontiac. Yes Hydromatic tranmissions were available in GMC trucks.
My GMC is Canadian and has the same running gear as a Chev would have, ie 236 I6 or a 283 V8 | | |
#10318 03/21/2003 6:44 AM | Joined: Apr 2002 Posts: 1,571 Shop Shark | | Shop Shark Joined: Apr 2002 Posts: 1,571 | I thought the 270 was mostly used in heavier trucks, with the 248 standard in light trucks from 1954. Someone here will know for sure. | | |
#10319 03/21/2003 6:21 PM | Joined: Feb 2003 Posts: 129 Shop Shark | | Shop Shark Joined: Feb 2003 Posts: 129 | I am positive GMC used a 270 in the late 50's as there 6 cylinder and I think the Pontiac V8 was a 336. Check out www.1955gmc.com and under literature he has a 1958 owners guide shown. | | |
#10320 03/22/2003 4:59 AM | Joined: Feb 2003 Posts: 129 Shop Shark | | Shop Shark Joined: Feb 2003 Posts: 129 | | | |
#10321 03/24/2003 4:41 AM | Joined: Feb 2000 Posts: 587 'Bolter | | 'Bolter Joined: Feb 2000 Posts: 587 | How long did Poncho use the hydramatic? Does that engine have the big dip at top of bellhouse mounting flange like later ones? If it did, would think a later 350 or 400 trans would bolt up. Shifter, another mess for sure. For all the trouble on an old truck, might as well get used to shifting. He could put in a 420 4spd to get it on the floor, always better than a column shift. Might as well just drop in a Chevy V-8 and matching trans and motor on. I'm sure that old Pontiac is tough to fine parts for!
G.L. Grumpy's
Old Iron Ranch
Huntington, IN 46750
MM R tractor, Speedex
and Power King tractors
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