Third Member from Open to "P" Case Conversion

[heddrik]

Wow! never seen either of those, just know they are rare and cheap, right? I bought gwagon's late 64 QB block a few weeks ago, my first and probably only 09. Always wanted one. This site and people on it are super.

 

[Junky]

Please illuminate my ignorance on this issue. What is an open carrier? Pics plz. How does a posi differ? I thot it was just another gear for the other side . Never tore into one so any help is a good thing. My 62 SS was a 10 bolt 3.08 powerglide. Thank you gentlemen.

When you say "was", that begs the question, what happened to it? I am looking for a 3.08 for my wagon. That way, I will be able to get 11 MPG, instead of 10!

 

[Iowa409]

yes sir, nothing to add to that spot on Phil.

 

[Iowa409]

I do have a 3.08 OPEN I just pulled out of my 64, drove 800 miles home, no issues at all, but its NOT a "P" Posi.

 

[lennyjay]

I believe if you have a 3-serris (not the "P") case (open 3.08,3.36,3.55,3.70) you can install an after market posi, Auburn or Eaton, and you do not need to grind the inside of the case....they fit. The larger GM posi it will need to be ground. Tom on a Chevy talk link goes into great detail on which year cases are the strongest along with thick and thin ring and pinion gear sizes that will fit. I must have read it 5 times..........

 

[models916]

The case is just a marking to let you know it been Modified, factory or yourself. Nothing to do with Posi or not.

 

[blkblk63ss]

I believe if you have a 3-serris (not the "P") case (open 3.08,3.36,3.55,3.70) you can install an after market posi, Auburn or Eaton, and you do not need to grind the inside of the case....they fit. The larger GM posi it will need to be ground. Tom on a Chevy talk link goes into great detail on which year cases are the strongest along with thick and thin ring and pinion gear sizes that will fit. I must have read it 5 times..........

That's odd ,I must have been the only guy in the world that had to grind out my non posi case to install a posi unit. I went from 3:08 gears to 3:36 .

 

[lennyjay]

What posi unit (factory GM or after market) did you install??

I stand corrected....you must grind all non-posi cases to in install any posi unit. See link...

https://www.chevytalk.org/fusionbb/showtopic.php?tid/223802/

 

[blkblk63ss]

What posi unit (factory GM or after market) did you install??

I stand corrected....you must grind all non-posi cases to in install any posi unit. See link...

https://www.chevytalk.org/fusionbb/showtopic.php?tid/223802/

Eaton positraction with new 3:36 gears.

 

[lennyjay]

Are the Eaton's good? They go for 475.00 to 550.00 new.....which is not bad.

 

[blkblk63ss]

I went by what the guy's recommended here said that they were the best.

 

[Don Jacks]

Yes,in most applications,the Eatons is the better unit.

 

[Silversport 63]

If you're just swapping it over that's all that's two it just change the seals and maybe the bearings. You only have to grind the original case to make it posi I done it it took 10 minutes of work

 

[Iowa 409 Guy]

Are the Eaton's good? They go for 475.00 to 550.00 new.....which is not bad.

I've had good luck with my Eaton in the Crusher.

 

[Don Jacks]

Eaton is among the very best that you can buy.