Consistency

Steve L · 04-01-2007, 11:46 PM

I know this isn't a bracket site but I also know this is where the info is. Question: 70 Pontiac Lemans,350 c.i. built similar to stock rules, is a powerglide or a turbo 350 more consistant ? Also,car came with a b.o.p. 10 bolt. Is this rear worth putting any money in, or should I go with a 12 bolt ? I'm planning on trying stock in the future so I don't want to spend money where it's not needed. Car is not tubbed and is still in the building stage.It's basically a street car now torn down and getting cleaned,painted and ready for the strip.

Steve

Adger Smith · 04-02-2007, 12:19 AM

I would take a long hard look at where you are going with your project & build with parts that will suit your later needs. Some cars never came with a P/G & only a 3 speed is allowed in those classes. No sense spending double.
my .02 for what it's worth

Adger Smith

Steve L · 04-02-2007, 12:38 AM

Thanks for the response Adger. I thought some of the 350 engine cars came with the powerglide. If I'm wrong let me know. Thanks

Dave Ribeiro · 04-02-2007, 09:13 AM

Steve,

As Adger said stay as close to stock as possible..I do think they came with T-350, and yes the T-350 is the way to go...I would leave the tubs STOCK, don't touch them..You can still get a 30X9"
radial slick in there on a 10 "rim,with the right off-set....They made two 10 bolt rears, 8.2 and 8.5..The 8.2 is not very strong, but the 8.5 is what I use in my firebird and can handle a 455ci motor if set-up with good parts.You do need to decide if this is a race car or a street car ???? Good Luck Dave...1033/stock( 350)

Chuck Norton · 04-02-2007, 10:26 AM

Both Adger and Dave are correct. It does't appear that a Powerglide was available in 1970. The classification guide does not indicate a difference in shipping weights for TH, usually a clue that the PG was available.

c

Steve L · 04-02-2007, 01:13 PM

Dave:
Is the 8.5 rear a direct bolt in for this car? If so,what cars did they originally come in? I'll start looking for one.What should I expect to pay for a stock one? Thanks

greg fulk · 04-02-2007, 03:56 PM

A 70 is an 8.2 . if you can find a lemans a few years newer it will be a an 8.5. the chevelle should be the same thing too.

novamoation

rayfin · 04-07-2009, 09:48 PM

The easiest way to spot a 8.5 10 bolt is; it has square corners on the bottom middle near the rear cover.

Mark Yacavone · 04-07-2009, 11:09 PM

Quote:

Originally Posted by Steve L

Thanks for the response Adger. I thought some of the 350 engine cars came with the powerglide. If I'm wrong let me know. Thanks

Sorry bud, but you stepped into one of my pet peeves.

Pontiac did not use a Powerglide transmission, ever. Neither did Buick or Oldsmobile.
They did use a planetary two- speed known as the Super Turbine 300 ,or the Jetaway, depending on the brand. The only thing that's the same as a PG, is the gear ratio (1.76 PG) . The BOP trans is a stronger unit than the PG in stock form, but it never had any aftermarket support.
Calling one of these 2- speed transmissions a Powerglide would be no more correct than calling it a Fordomatic or a Powerflite.

Now , for your question. Put a Turbo 200 3 speed in it and look for a Chevelle , Monte Carlo or 70 GTO 12 bolt in it in case you ever want to use a 4.33 ring and pinion.

Tom keedle · 04-08-2009, 03:34 AM

Quote:

Originally Posted by Mark Yacavone

Sorry bud, but you stepped into one of my pet peeves.

Pontiac did not use a Powerglide transmission, ever. Neither did Buick or Oldsmobile.
They did use a planetary two- speed known as the Super Turbine 300 ,or the Jetaway, depending on the brand. The only thing that's the same as a PG, is the gear ratio (1.76 PG) . The BOP trans is a stronger unit than the PG in stock form, but it never had any aftermarket support.
Calling one of these 2- speed transmissions a Powerglide would be no more correct than calling it a Fordomatic or a Powerflite.

Now , for your question. Put a Turbo 200 3 speed in it and look for a Chevelle , Monte Carlo or 70 GTO 12 bolt in it in case you ever want to use a 4.33 ring and pinion.

68-72 12 bolt chevelle/70-72 monte carlo rears will be a bolt-in (bring checkbook)
64-67 chevelles are an 1.5" narrower(bring 2 checkbooks)...
if you are not going class racing,i'd stick a 9" in it.
it'll be cheaper in the long run...

04-01-2007, 11:46 PM	#1
Steve L Junior Member Join Date: Feb 2007 Posts: 5 Likes: 0 Liked 0 Times in 0 Posts	Consistency I know this isn't a bracket site but I also know this is where the info is. Question: 70 Pontiac Lemans,350 c.i. built similar to stock rules, is a powerglide or a turbo 350 more consistant ? Also,car came with a b.o.p. 10 bolt. Is this rear worth putting any money in, or should I go with a 12 bolt ? I'm planning on trying stock in the future so I don't want to spend money where it's not needed. Car is not tubbed and is still in the building stage.It's basically a street car now torn down and getting cleaned,painted and ready for the strip. Steve

04-02-2007, 12:19 AM	#2
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	I would take a long hard look at where you are going with your project & build with parts that will suit your later needs. Some cars never came with a P/G & only a 3 speed is allowed in those classes. No sense spending double. my .02 for what it's worth Adger Smith __________________ Adger Smith (Former SS)

04-02-2007, 09:13 AM	#4
Dave Ribeiro VIP Member Join Date: Sep 2002 Location: Williamsburg, Va.---USA Posts: 1,827 Likes: 1,612 Liked 56 Times in 27 Posts	Steve, As Adger said stay as close to stock as possible..I do think they came with T-350, and yes the T-350 is the way to go...I would leave the tubs STOCK, don't touch them..You can still get a 30X9" radial slick in there on a 10 "rim,with the right off-set....They made two 10 bolt rears, 8.2 and 8.5..The 8.2 is not very strong, but the 8.5 is what I use in my firebird and can handle a 455ci motor if set-up with good parts.You do need to decide if this is a race car or a street car ???? Good Luck Dave...1033/stock( 350) __________________ Dave Ribeiro 1033 STK

04-02-2007, 10:26 AM	#5
Chuck Norton Member Join Date: Dec 2001 Location: Covina, CA Posts: 472 Likes: 92 Liked 76 Times in 17 Posts	Both Adger and Dave are correct. It does't appear that a Powerglide was available in 1970. The classification guide does not indicate a difference in shipping weights for TH, usually a clue that the PG was available. c __________________ Chuck Norton

04-02-2007, 03:56 PM	#7
greg fulk VIP Member Join Date: Jan 2003 Location: jackson Posts: 1,165 Likes: 0 Liked 5 Times in 3 Posts	A 70 is an 8.2 . if you can find a lemans a few years newer it will be a an 8.5. the chevelle should be the same thing too. novamoation __________________ Greg Fulk 308 308X P/SA "ALL AMERICAN"

04-02-2007, 12:38 AM	#3
Steve L Junior Member Join Date: Feb 2007 Posts: 5 Likes: 0 Liked 0 Times in 0 Posts	Thanks for the response Adger. I thought some of the 350 engine cars came with the powerglide. If I'm wrong let me know. Thanks

04-02-2007, 01:13 PM	#6
Steve L Junior Member Join Date: Feb 2007 Posts: 5 Likes: 0 Liked 0 Times in 0 Posts	Dave: Is the 8.5 rear a direct bolt in for this car? If so,what cars did they originally come in? I'll start looking for one.What should I expect to pay for a stock one? Thanks

04-07-2009, 09:48 PM	#8
rayfin Member Join Date: Mar 2009 Location: sioux city Posts: 134 Likes: 1 Liked 0 Times in 0 Posts	Re: Consistency The easiest way to spot a 8.5 10 bolt is; it has square corners on the bottom middle near the rear cover.