Trans question. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1000000to1 · 06-27-2011, 02:12 AM

Anyone know what type of tranny is in my 58 Gmc? it is a three in the tree behind a 235 inline 6 and is there any way to bolt a 1980 olds 350 rocket to this trans? Thanks for your help.

OrrieG · 06-27-2011, 10:45 AM

I do not know when BOP (Buick Olds Pontiac) changed to the same bellhousing pattern as Chevy. Transdapt and Wilcap are two companies that have adaptors for different engine/transmission combos.

1000000to1 · 06-27-2011, 03:56 PM

Thanks that is what I was looking for.

1000000to1 · 06-27-2011, 04:24 PM

Does anyone know what type of trans these 3 speeds are?

OrrieG · 06-27-2011, 08:52 PM

see if this helps.

http://webcache.googleusercontent.co...www.google.com

Gene Sharp · 07-03-2011, 01:57 PM

Borg Warner ?

Gene Sharp

dwcsr · 07-03-2011, 08:14 PM

It should be a Muncie SM 318 if its stock. The buick, olds pontiac 3 speed transmissions are not the same. You should go with a Saginaw 3 speed mid 70's it has syncro 1st and is about the same length better able to handle a 350.

1000000to1 · 07-04-2011, 04:03 AM

Quote:

Originally Posted by dwcsr

It should be a Muncie SM 318 if its stock. The buick, olds pontiac 3 speed transmissions are not the same. You should go with a Saginaw 3 speed mid 70's it has syncro 1st and is about the same length better able to handle a 350.

Awesome thanks!

**mr48chev** · 07-04-2011, 10:50 AM

I've got a Saginaw three speed in my 48 and it is worlds smoother than the old transmissions were be they the stock ones or later style non syncro.

You don't need an adapter for that but will need a stick bellhousing for the Olds 350 (one of the BOP) units. plus the Olds flywheel. There should be plenty of bellhousings around because they had a lot of them in Firebirds but the flywheel might be a challenge although they had the Olds engines in the Firebirds too. You might even score a fourspeed in the process.

1000000to1 · 07-11-2011, 03:51 AM

Quote:

Originally Posted by mr48chev

I've got a Saginaw three speed in my 48 and it is worlds smoother than the old transmissions were be they the stock ones or later style non syncro.

You don't need an adapter for that but will need a stick bellhousing for the Olds 350 (one of the BOP) units. plus the Olds flywheel. There should be plenty of bellhousings around because they had a lot of them in Firebirds but the flywheel might be a challenge although they had the Olds engines in the Firebirds too. You might even score a fourspeed in the process.

Ya I'm going hunting tomorrow at the salvage yard to see what I can find, thanks for the info.

06-27-2011, 02:12 AM	#1
1000000to1 Registered User Join Date: Sep 2005 Location: Bienfait, Saskatchewan, Canada Posts: 308	Trans question. Anyone know what type of tranny is in my 58 Gmc? it is a three in the tree behind a 235 inline 6 and is there any way to bolt a 1980 olds 350 rocket to this trans? Thanks for your help. __________________ 2013 avalanche 5.3l 1971 Gmc 350 1958 Gmc fleetside

06-27-2011, 10:45 AM	#2
OrrieG Registered User Join Date: Jun 2006 Location: Idaho Posts: 8,800	Re: Trans question. I do not know when BOP (Buick Olds Pontiac) changed to the same bellhousing pattern as Chevy. Transdapt and Wilcap are two companies that have adaptors for different engine/transmission combos. __________________ 1959 Chevy Short Fleetside w/ 74 4WD drive train (current project) OrrieG Build Thread 1964 Chevelle Malibu w/ 355-350TH (daily driver) Helpful AD and TF Manual Site Old Car Manual Project

06-27-2011, 03:56 PM	#3
1000000to1 Registered User Join Date: Sep 2005 Location: Bienfait, Saskatchewan, Canada Posts: 308	Re: Trans question. Thanks that is what I was looking for. __________________ 2013 avalanche 5.3l 1971 Gmc 350 1958 Gmc fleetside

06-27-2011, 04:24 PM	#4
1000000to1 Registered User Join Date: Sep 2005 Location: Bienfait, Saskatchewan, Canada Posts: 308	Re: Trans question. Does anyone know what type of trans these 3 speeds are? __________________ 2013 avalanche 5.3l 1971 Gmc 350 1958 Gmc fleetside

06-27-2011, 08:52 PM	#5
OrrieG Registered User Join Date: Jun 2006 Location: Idaho Posts: 8,800	Re: Trans question. see if this helps. http://webcache.googleusercontent.co...www.google.com __________________ 1959 Chevy Short Fleetside w/ 74 4WD drive train (current project) OrrieG Build Thread 1964 Chevelle Malibu w/ 355-350TH (daily driver) Helpful AD and TF Manual Site Old Car Manual Project

07-03-2011, 01:57 PM	#6
Gene Sharp Registered User Join Date: Nov 2003 Location: Texas Posts: 183	Re: Trans question. Borg Warner ? Gene Sharp

07-03-2011, 08:14 PM	#7
dwcsr Hollister Road Co. Join Date: Apr 2005 Location: Houston Posts: 6,131	Re: Trans question. It should be a Muncie SM 318 if its stock. The buick, olds pontiac 3 speed transmissions are not the same. You should go with a Saginaw 3 speed mid 70's it has syncro 1st and is about the same length better able to handle a 350.

07-04-2011, 10:50 AM	#9
mr48chev Registered User Join Date: Jul 2007 Location: Toppenish, WA Posts: 15,719	Re: Trans question. I've got a Saginaw three speed in my 48 and it is worlds smoother than the old transmissions were be they the stock ones or later style non syncro. You don't need an adapter for that but will need a stick bellhousing for the Olds 350 (one of the BOP) units. plus the Olds flywheel. There should be plenty of bellhousings around because they had a lot of them in Firebirds but the flywheel might be a challenge although they had the Olds engines in the Firebirds too. You might even score a fourspeed in the process. Last edited by mr48chev; 07-04-2011 at 11:01 AM.



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