got a jimmy 6 in my 58 biscayne. what autotrans mounts right up to this. th350? Sent from my SM-J700T using The H.A.M.B. mobile app
What year engine do you have? the 1963 and newer sixes all use the same trans as the small block V8,s now if you have a genuine 1950.s GMC six they never made a 250 cu engine in the 50,s. Those where 228-248 or 270 cu in.
...and the only trans that might bolt up without a $$$ adapter is an old Hydramatic, or maybe a cast iron Powerglide?
The also made some V6 engines but none of them where 250,s. ive seen a few V6,s with powerglides. Now I think any automatic that came behind a 235 or 261 could be installed behind a GMC inline six. The flywheel would be the major problem. Many GMC sixes have only 4 bolts that attach the flywheel to the crankshaft.
That's what I was thinking, too. The Hydramatic was slightly popular in GMC trucks, since it was the "cowboy Cadillac", compared to Chevys. But a Chevy powerglide from a 235 equipped p***enger car would be easier to find, by a long shot. And I think the Chevy flexplate could maybe be adapted?
When I was in the Army we had lots of GMC 302 powered trucks with Hydromatics. Maybe a Military s**** dealer has what you want?
Actually there is lots of military parts available. There is a huge following of WWII reinactors. My son bought a 1944 WC dodge and everything was available . It was pricey but it was easy to locate. There are Military forums. The 302 GMC Truck engines are physically larger than the 370 and smaller displacement engines. The First AD truck I ever owned was a 50 GMC with a 228. I very quickly learned there was a lot of difference between the GMC and Chevy trucks built back then. Ive seen several GMC trucks with the Hydro Trans. I always thought I would like to own a 54 or 55 first series deluxe cab GMC.
I would expect it to be easier to find an old GMC pickup with a hydro, but then I haven't looked for the military stuff. I live in an old military town, Ft Huachuca is where all the money is in town here, and I have not seen any old military stuff around at all in the past decade or two. Aside from that S-250 shelter sitting on a corner by a gas station, as art.
Theres a place near Memphis Tenn. Southern Truck and Equiptment. For decades they bought huge quan***ies of Government Surplus. They used to repower the old6 by sixes with modern diesel engines and rebuild them from bumper to bumper. I at one time had a DOD bidders number and received all the catalogs of the surplus auctions. The surplus isn't sold at most active bases. Its sold at bases that warehouse the items. Lots of surplus is sold near Texarkanna. I was just last week looking online at stuff that has been brought back from overseas. Local government,s all across the nation have items that are sold on the government deals website. Old cop cars just everything from AtoZ
Heres a linkhttps://www.govplanet.com/jsp/s/search.ips?s=1647871&st=1&kwtag=herocarousel&kwtag=herocarousel
I believe this statement is inaccurate. I have had 248, 270 and 302 GMC engines and all are the same external physical size. There are detail differences, bore and stroke and heads vary regarding port sizes, etc. But overall length and height is the same in my experience. Ray
The 302,s that I seen the crankcase could be unbolted from the block where the cylinders are located. I seen them in old AD GMC truck tractors. Never owned one but they appeared larger?
Well I really don't know. But there sure were a bunch of them at one time. Wouldn't hurt to check around.
I have used several 302 and 270 GMC engines in Bonneville cars. They are the same for most practical purposes. Bore and cylinder offset are the only differences that I am aware of.
Greaser. If you have the stock 6 which will be a 235 and the same up to 1962 a company called Buffalo Enterprises in Oregon which makes an adapter to bolt all the later bellhousings to the early Chevrolet and GMC 6's. He also makes the starter ring gear. His adapter allows the layer model starters also other wise you are stuck with the cast iron powerglide or if you can find some with an old hydramatic set up from a GMC or even a Chevrolet pickup with 6 automatic which from 55-59 pretty rare. Good luck.
Let me make a little correction here; Buffalo Enterprises is located at 25625 Dahl Road, Arlington, Washington State, 98223, and (360)652-7684. That is unless they've moved, and I'm just not aware of it. I would go with a later model automatic transmission, unless you're very familiar with the old, dual range Hydramatics, or know someone who is. Personally, I'd go with a late model 250 six and a TH350 transmission, or even a V-8 swap. IF your engine truly is a 250, then it's the late model style six with 7 main bearings. Course your 58 also has a 2 piece driveline, and that will complicate just about any swap or transmission swap you do; the driveline may have to be shortened. Good luck. I am Butch/56sedandelivery.
thanx it is a swap 60s engine not stock to 58. checked engine #s eng 250 Sent from my SM-J700T using The H.A.M.B. mobile app
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