Projects B-O-P Power Glide

I'm buying a Buick 300 this weekend with the Power Glide. Is the BOP version rare or anything special? Hate to sell it and regret it later on.

 

Had to update the answer a bit as not all two speed GM automatics were powerglides .
I remember that a lot of the mid 60's Non Chevy mid size cars that I worked on in the 70's had two speed transmissions in them though.

 

It's not a Powerglide, it's probably a Super Turbine 300. If it has the 12" variable pitch torque converter, then the converter is a sort of desirable core...I have a modified one of those in the variable pitch TH400 in my Chevy II. Lots of fun.

Although there isn't much demand for the transmission itself...

 

If you would have simply gotten on the internet and done a quick google ( "BOP powerglide"), you would have already found the answer you're looking for. And no, I'm not going to spoil it by telling you, look for yourself.

 

^If you have knowledge, why don't you share it?
I would, that's one of the reasons I'm here. Another, is gathering knowledge from those that know.
First I've heard of a Super Turbine 300...see how that works?
Shar yer nawl age

 

Squirrel had the answer for him. No real need to chime in there like that. That’s something google doesn’t tell you.


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But you have to admit that a BOP Powerglide would be a RARE BEAST!

 

I would also confuse him by saying that it was a (later model) Jetaway!

 

And here is the answer:

https://www.racingjunk.com/Automati...DE-POWER-GLIDE-CASE-FITS-ALL-RARE-ONLY-M.html

And this:
BOP PG was really rare but they're out there. I'm in a pretty big trans shop and we've maybe got 2-3 over the last 15 years mixed in with cores. I may have one of those cases around right now. The easy way is to cut the bell off and put an ultra bell on as they will have the double pattern for BOP.

 

Another fine GM confusion: Early Pontiac Tempest-torque transmissions were Corvair Powerglides, but the later Pontiac Tempest-torques were ST300/Jetaways! Guess there way a shortage of transmission names!
And if you are really looking to sell the BOP Powerglide, you may want to find a dual pattern TH2004R to replace it with. Then you can use either a BOP(C) or Chevy engine.

 

the one you're talking about is a Pontiac transmission...the one the OP is talking about is on a Buick 300 engine, which was the ST300, not the Powerglide.

 

I had a 69 Olds Cutlass convert. It had a 350 Olds 2 barrel, PS, Radio, heater, and no other options. The trans was a 2 speed and acted like all the other 2 speed glides I I ever had in a Chevrolet.

 

Super Turbine 300, Also known as ST300, 300THM or Jetaway.
Used 1964-69, two (2) speed hydraulically controlled transmission used in some Buick, Olds and Pontiac models. It shared a FEW parts with the 1962-73 aluminum Powerglide.
Don't confuse this transmission with the Jetaway 315 that was used from 1956-64. The Jetaway 315 is the transmission most people mean when they refer to a "Jetaway".
https://www.charlietranny.com/300THM.htm

 

this is from a 64 Tempest, air cooled

 

Sooooo , is this from a Canadian Pontiac with a Chevy drive line , strange things happen north of the border !

 

64 2-dr Tempest,I bought the whole car in S.W. Pa at a farm auction, it's a Pontiac engine, not Chevrolet. it was powering a sawmill, had the rear end jacked up, a large dia pipe cut to about 8" in length, bolted to the drive side of the rear axle, flat belt turning the blade. put er in drive an GO!

 

Looking at your last pic that is an ST 300,but it looks to have a dual pattern bell and the bolts are in the chev mounting holes.
Maybe it is a Chev motor.

 

The trans

 

The BOP was a different bolt pattern bellhousing. There was a Dual Path Dynaflow in 1961 - 1963 which was it's own unique beast. I think they went to the BOP ST 300 when the 300 engine came out in 1964 but only on the small Buicks or the LeSaber with the base engine. They discontinued the Dual Path Dynaflow not because it was a problem but because they didn't see a future in a 2 speed transmission and wanted to reduce the number of them in the GM lineup. It was an improvement on the Powerglide. Most transmission repair shops have never seen one and will try and talk you into putting in a PG. The ST 400 was in most LeSaber to give the little 300 some help in that big boat.

BTW that 300 was an enlarged version of the Aluminum 215 V8 and the first cousin of the V6 Buick. The first year (1964) it was iron block and aluminum heads but all iron after that. They enlarged it to 340 cid in 1967 and 350 in 1968. It was an exceptional engine and 125 pounds lighter than a small block Chevy. The line of engines from the short lived Buick 215 is kind of amazing, from the V6 to the 350 and even the basis for the Repco V8 Brabham that won the 1965 and 1966 F1 World Championship to it's last production in the GM 3800 V6 that was used until 2008.

 

That's a ST300, not Powerglide.

 

Learn something new every day!
I have been in the transmission business for almost 40 years and have never seen a dual pattern Powerglide case.

Bill

 

Curses. I reckon its worth little less than the PG? Not trying to get rich. Just thin the heard

 

Also, how are the ST300's? Stuck between that or a 4 spd behind my 215.

 

Well if you had enough room you could use a ST400 or even a BOP TH350. Depends on the tunnel and how long you want the driveshaft to be. If you use the ST transmission you can use the switch pitch torque converter. They came with a switch for the throttle but some people have a dash switch so they can set it in high stall for drag racing. Olds and Buick had the trick converter, Pontiac did not.

Me? I like to do my own shifting.

 

Caddy had it too.

I had a 65 Skylark with the 2bbl 300 and ST300 many years ago...it was a rather boring car to drive.

I have one of those converters in my Chevy II, in a 400 behind a blown 427, and it's a fun ride. 9.89 is the best ET so far

 

In my opinion, the 300 has some components that are better than the Powerglide.

Bigger diameter input shaft, bigger pump gears, simplified hydraulic control, more modern governor, simplified valve body, electric passing gear to name a few.

The 300 pressure control is done with a modulator only. No throttle rod to carb.

The Powerglide has a modulator and a throttle rod to the carb to control pressure.

Clutches and band are the same and power flow is the same.

I would not be afraid to use a 300, if I wanted a 2 speed.

The only problems we see with a 300 is, some have a bonded rubber servo piston that is pretty much not available, but the servo can be changed to the aluminum version.

Bill

 

That 215 Pontiac is a variation of the Chevy 194/230/250 inline six family introduced in the 1962 Chevy II, if I recall. As such, it makes sense that it has a Chevy bolt pattern on the rear face, and the dual pattern transmission that is likely the same as used on the 326 V8 powered Pontiac B body siblings.

 

Which 215 are you referring to, the Buick 215 v8 had its own bell housing the 300 trans uses the BOP bell the st400 is different and isn’t a BOP bell either.


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My buddy who is big on dealing mid 60's GM mechanical shit loves those switch pitch converters out of those transmissions and apparently they sell for decent money on eBay but says the trans itself is almost worthless.

 

The inline Pontiac 215 is a small piston 230, used only in Pontiacs. It says Pontiac on the block but it is the Chevy design.. Used 64-64, before the SOHC 230 came out.
The ST 300 is a bit stronger than the PG. It has a 1.76 low gear, only. No aftermarket support though.
The 6 cylinder converter will stall 2000 + , behind a big Pontiac with a T 350 or 400.