Click on image for the lowdown. 
====
| | | Forums66 Topics128,120 Posts1,056,649 Members48,450 | | 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!
| | 
#60865 05/25/2006 4:11 AM | Joined: May 2006 Posts: 8 New Guy | | New Guy Joined: May 2006 Posts: 8 | I have a '67 GMC pickup with a 250 and a 3 speed column shift. I'm wanting to put an automatic in it, but I don't care anything about bumping up to another engine.
I had a couple of people tell me today that a 350 turbo is the way to go, but I have a problem! My starter bolts around the nosecone to the transmission via 3 bolts. The 350 turbo would require the starter to bolt to the block.
Is there any autos out there that have the mounting surface for my starter, or do I have to swap all or nothing?
1939 Chevy 1/2 ton AKA Light Delivery.
1967 GMC 1/2 ton short-step.
| | |
#60866 05/25/2006 6:18 AM | Joined: Dec 2004 Posts: 1,897 Shop Shark | | Shop Shark Joined: Dec 2004 Posts: 1,897 | try buffalo enterprises. they make adapter plates for that purpose. you will also need a flexplate flywheel.
buffalo's contact:
25625 Dahl Road, Arlington, WA, 98223
(360) 652-7684 | | |
#60867 05/25/2006 9:23 PM | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | Have you looked at your block? It seems it would be drilled for the bolts comeing up from the bottom.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | |
#60868 05/25/2006 10:23 PM | Joined: May 2003 Posts: 328 Shop Shark | | Shop Shark Joined: May 2003 Posts: 328 | Welcome to the 'bolt Robert!
I seem to recall powerglides being placed behind 250 cu.in. engines. Would you consider a 'glide?
Phil
Never hold your farts in. They travel up your spine and into your brain...that is where crappy ideas come from.
| | |
#60869 05/25/2006 10:39 PM | Joined: Jan 2005 Posts: 364 Shop Shark | | Shop Shark Joined: Jan 2005 Posts: 364 | I believe a TH 350 will bolt up, if the truck came with an automatic the starter would've had to bolt to the block, you'll need a starter and flex plate for a 250 6cyl with automatic. As Wrenchbender said, the bolt holes should be there.
Keith
If it were easy they'd have grade schoolers doing it!
| | |
#60870 05/26/2006 12:06 AM | Joined: May 2006 Posts: 8 New Guy | | New Guy Joined: May 2006 Posts: 8 | Well, you guys were right! Once I dug through the grease, I found a hole! (didn't pull the starter to look for hole #2, but it's probably there too) I never would have thought that starters had dual mount - depending on transmission.
Thanks for the info...I didn't want to have to swap motors as well. Some people think I'm goofy for not dropping a 350 in the truck, but at this point I'm perfectly content with the output of the 250.
1939 Chevy 1/2 ton AKA Light Delivery.
1967 GMC 1/2 ton short-step.
| | |
#60871 05/26/2006 12:09 AM | Joined: May 2006 Posts: 8 New Guy | | New Guy Joined: May 2006 Posts: 8 | Originally posted by Phil 1953 GMC:
Welcome to the 'bolt Robert!
I seem to recall powerglides being placed behind 250 cu.in. engines. Would you consider a 'glide?
Phil I don't know anything about them, other than they are 2 speed. I may be wrong, but I figured if you split it into 3 and went with a th350 then you'd have better low end as well as a lower highway rpm. (like I said though, don't know nuthin 'bout 'em! Maybe the ratio is different than what I'd expect.)
1939 Chevy 1/2 ton AKA Light Delivery.
1967 GMC 1/2 ton short-step.
| | |
#60872 05/26/2006 2:18 AM | Joined: Oct 2003 Posts: 5,152 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Oct 2003 Posts: 5,152 | Both the Powerglide and the TH350 have direct as the final or top gear same as the stock 3-speed.
Years ago I had a '66 that had a Powerglide and it seemed to work pretty well, but it was a 327.
Today I have a '72 with a TH350 and a 350 and it drives pretty nice.
The Powerglide would use a little less power and if I remember right weighs slightly less than the TH350. That might have some performance advantage with the smaller motor, but I doubt it makes enough difference to matter.
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... | | |
#60873 05/26/2006 1:56 PM | Joined: May 2006 Posts: 8 New Guy | | New Guy Joined: May 2006 Posts: 8 | Originally posted by OldSub:
Both the Powerglide and the TH350 have direct as the final or top gear same as the stock 3-speed.
I guess that means I've got some low gears then! This 250 sounds like she's winding pretty tight when I get up over 60mph! Did they normally put low gears in with the 250/3 speed combo, or were most of them geared low no matter what combo?
1939 Chevy 1/2 ton AKA Light Delivery.
1967 GMC 1/2 ton short-step.
| | |
#60874 05/26/2006 10:39 PM | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | Find out what your rear end ratio is. 3:90 or 3:73 you may want to put a 700-4r auto o-drive. If it,s higher than that (lower number) use the 350TH.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | |
#60875 05/29/2006 5:10 AM | Joined: Mar 2005 Posts: 75 Member | | Member Joined: Mar 2005 Posts: 75 | most all 250 with three on the tree had a 3:73 rear gear.
super250six | | |
|
|
