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I-6 Engines For GMCs that came with the Inline 6 Engines

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  #1  
Old September 2nd, 2013, 02:50 PM
kaneerarchery kaneerarchery is offline
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Default New owner of 1966 gmc

I am a new member to this forum. I just purchased a1966 GMC stepside. It originally had an inline 6. It has been replaced with a mid 1970's Chevy 350. There is no transmission. I would like to put an inline 6 back into the truck. The truck has a 3 speed column without a shift lever as well as a hole in the floor where a floor shifter was added. What floor shift transmissions or automatic transmissions are recommended for inline 6's.
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Old September 2nd, 2013, 10:18 PM
raycow raycow is offline
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Default Re: New owner of 1966 gmc

You didn't say how you planned to use the truck. For general purpose driving with occasional hauling not exceeding the truck's GVW, I like the T-5. If an automatic, the 200-4R. Both of these transmissions have overdrive, which will make highway driving much more pleasant. If the truck is presently set up for a manual, the T-5 will be a lot less work to install than the 200-4R.

If you have a more specialized usage in mind, please describe it.

Ray
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Old September 3rd, 2013, 02:03 AM
kaneerarchery kaneerarchery is offline
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Default Re: New owner of 1966 gmc

I would like to drive it about 50 miles per week. Will the t-5 bolt up to an inline 6 without an adapter. What donor vehicle should I look to pull a t- 5 from.
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Old September 3rd, 2013, 06:15 PM
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quest quest is offline
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Default Re: New owner of 1966 gmc

I think you can find the T5 easily at your local pick n pull. they're pretty common GM 5 spd I think. it's easy to research on google about what to look for. Do you have a drive shaft, if not you will likely have to get one custom fitted with a non stock setup anyway. If you are going back to the I6 then a stock 3 on the tree will be fine, kinda depend on the rear end ratio you have and how much hiway driving you think you will do, over drive with 373's is good for that. With the T5 you will need to see where the shifter would end up coming out in the floor, you may have some mods to make if it isn't in the same spot.
Good Luck, sounds like fun.
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Old September 4th, 2013, 12:06 AM
raycow raycow is offline
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Default Re: New owner of 1966 gmc

Quote:
Originally Posted by kaneerarchery View Post
Will the t-5 bolt up to an inline 6 without an adapter. What donor vehicle should I look to pull a t- 5 from.
A T-5 from a 1992 or earlier Camaro or S-10 will have the correct bolt pattern. The Camaro will bolt to your bellhousing with no modifications except for replacing the clutch disc. The S-10 requires the input shaft pilot and bearing retainer to be shortened about 1/2", or you can use a commercial spacer plate like this:
http://hamiltonintakes.com/products/...5-swap-adapter

IMO, the S-10 is preferable to the Camaro because of the shifter location. I have had an S-10 gearbox in my 60 C-10 for about 12 years now and I am totally satisfied with it.

Ray
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Old September 4th, 2013, 03:38 AM
kaneerarchery kaneerarchery is offline
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Default Re: New owner of 1966 gmc

Thanks for all of the good information.
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Old April 3rd, 2014, 02:24 PM
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kieth kieth is offline
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Default Re: New owner of 1966 gmc

Quote:
Originally Posted by kaneerarchery View Post
I am a new member to this forum. I just purchased a1966 GMC stepside. It originally had an inline 6. It has been replaced with a mid 1970's Chevy 350. There is no transmission. I would like to put an inline 6 back into the truck. The truck has a 3 speed column without a shift lever as well as a hole in the floor where a floor shifter was added. What floor shift transmissions or automatic transmissions are recommended for inline 6's.
I have a 250 6 cylinder that we removed from my 66 gmc complete engine with accessories, transmission still attached would take 200.00 for it. Kieth

here is a picture:
http://kieth.smugmug.com/Trucks/66-GMC/i-T3x6Tkd
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Old April 4th, 2014, 12:12 AM
bigblockv6 bigblockv6 is online now
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Default Re: New owner of 1966 gmc

For 1966 inline sixes there were two 4 speed transmission choices, the GM SM-420 and the New Process NP-435GA. For automatics there was the 2 speed Pow-R-Flow(otherwise known as the Powerglide). If you're considering any of the 4 speed transmissions mentioned you will need to the taller transmission floor cover.
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