1966 Power Glide to TH350 Conversion - Impala Tech
Transmission & Driveline Transmissions & Differentials

 
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post #1 of 4 (permalink) Old 09-30-2019, 09:14 PM Thread Starter
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1966 Power Glide to TH350 Conversion

Good Evening,

My 66 has had the original Power Glide converted to TH350, mine is a column shift is there a conversion kit or list of parts needed to convert the column shift from 2 to 3 positions. Any help is appreciated.
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post #2 of 4 (permalink) Old 09-30-2019, 10:09 PM
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Quote:
Originally Posted by lndbarron View Post
Good Evening,

My 66 has had the original Power Glide converted to TH350, mine is a column shift is there a conversion kit or list of parts needed to convert the column shift from 2 to 3 positions. Any help is appreciated.

There are several companies that sell the detent combs and longer rods as well as the plastic replacement lens with the correct four speed markings to make your TH350 (or four speed OverDrive) auto look like a factory install.

Lens covers:
https://shiftworks.com/collections/column-shift

Longer rod to find missing gears with a TH350 or 700R4 on column shift.
https://lateral-g.net/shiftin-gears-...4l80e-4l60e-1/

Detent comb and linkage for console:
https://www.classicindustries.com/pr...arts/s104.html


Big Dave
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post #3 of 4 (permalink) Old 10-02-2019, 11:15 PM
 
 
Join Date: Feb 2013
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More info to what Big Dave said: I have swapped transmissions in a few 60's Chevies. Consider an OD trans for awesome driveability. Since a 200R4 is a bit longer to the mount you have to get an aftermarket crossmember or weld two more brackets to the frame. The Powerglide has a face-to-mount length of 20 9/16". The TH350 is 20 3/8 so you need to tweak the trans mount a bit. And, a 200R4 is the same length but the mount is further back, 26 7/8." You have to make and weld an additional support bracket for the crossmember. I installed a BowTie Overdrive in a 66 Chevelle with original 283 and it gets over 20mpg now and it will even chirp the tires if that interests you.

My tech manual page won't load, but the new frame bracket is about 2-1/8 further back from the original. Some 66 frames had dual mounts from the factory, usually big block cars with a TH400 or all Caprice models.
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post #4 of 4 (permalink) Old 10-02-2019, 11:23 PM
 
 
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here is the image from the tech manual ...
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