After I finish my Camaro, my next project is a 67 Chevelle SS convertible. I have posted on the sister site, but no one has answerd my question. The car originally came with a Powerglide, but currently has a 4 speed. I would love to keep the 4 speed, but they only made 3,321 SS convertibles that year, so I am taking this car original.

All I know about Powerglides is that there are two types that have something to do with 1.7? and 1.8? gears. People who race, say the 1.7? is better.

Would the 1.8 be used on small blocks and the 1.7 be used on big blocks? Obviously. I am lacking on this subject. Please fill me in, if you know more when the 1.8 version was used vs. the 1.7 version.

Powerglides came in two flavors:
1. 1.76:1 first gear ratio for V8's
2. 1.82:1 first gear ratio for L6's.

V8 'Glides have gray/silver colored input shaft. L6 'Glides have dark, almost black, input shafts.

Other than that, this is about the only external difference between them.

All 'Glides after 1969 have an extra hole in the manual shaft lever as this is for the steering column lockout linkage.

They have 2 speeds forward and 1 speed backwards. Sorry couldnt help myself.

That is great!! Thanks

You cannot change the shiftpoints in a pg. Believe me, I tried. pain in the a. I am going to put a TH350 in my car because of it. If you where closer, you can have the PG.

Actually, if the code on the transmission pan has a 7 as the second letter, I would be interested.

Dont do a L6-v8 conversion and use the stock transmission, cuz before a year is up it'll take a poop!

John, it is a 68 trans. Sorry

I'd use the 1.82 instead of the 1.76 ratio. It will give you much better acceleration off the line, and you WILL need it with a Power-slide! Two ratios: 1.82 and 1:1

:sad:

Years ago I said I'd rather eat worms than have a 'glide.

But a 'glide can be made to do as well as any other trans if the right person does the modifications to it. It is limited by not having a real low first gear and no overdrive, but if you want to keep it, they can and will hold up under unbelievable amounts of power. Sure, the 1.76 is stronger than the 1.82, but unless you plan on doing something stupid like neutral drops, a fresh 'glide with a good shift kit and a bit more line pressure will work behind most any engine, no matter if it's a 1.82 or a 1.76. The two weak links are the input shaft and the cast front hub. Replace them and go for it!!

p.s. Don't use a solid rear trans mount either......

Yeah, I love my 'Glide too.
Steel hub, TCI input shaft with turbo spline, 1.76:1 low, full manual valve body, low drag, compact, cheap..
I have given it heaps with my 454 and sure, I've broken parts doing silly things, but just forget a TH350 if you're searching for strength, unless you're willing to throw lot's of money at it.
Power hungry TH400? -just try to pick one up and you'll probably change your mind.

One fall back of the "glide.. you need rear gears and decent converter (but it's more fun that way).