[mkeafer]

I am looking for a posi-traction for my 1964 Catalina.
What range of years will fit my car?
Thanks a lot in advance.

[63 Pontiac]

Pretty sure you'll need a 59-64 Pontiac or Olds rear. Earlier than 59 used a diff. spline on the axles.

[64catdroptop]

Also 2.69:1 - 3.23:1 will have a smaller housing than 3.42:1 & up, but if you buy it as a whole unit vs. putting 3.42 gears in, it shouldn't be an issue.

-r-

[tom s]

you mean the carrier?The rear ends are the same for all ratios.Tom

[Pmrockhead]

I have a 64 Catalina which seems to be around 2.75, measured the revolutions my self so I understand the real ratio from factory is a bit different. Anyway I want to change it to mid to upper 3’s. Can’t I just go to a reputable mechanic and have it done with after market gears? Does the current housing limit how steep I can go? If so how steep can I go? Thanks

[webfoot]

Originally Posted by Pmrockhead

I have a 64 Catalina which seems to be around 2.75, measured the revolutions my self so I understand the real ratio from factory is a bit different. Anyway I want to change it to mid to upper 3’s. Can’t I just go to a reputable mechanic and have it done with after market gears? Does the current housing limit how steep I can go? If so how steep can I go? Thanks

Probably a 2.69. Per the above, it sounds like you can go up to the 3:23 in the same carrier.
Fabcraft metalworks is a good source of these, and he could tell you exactly what you can and cant do with these carriers.

https://fabcraftmetalworks.com/contact-us/

[Pmrockhead]

Would I expect a notable performance in acceleration got from the 2.69 to 3.23. Or not worth spending the $

[tom s]

FYI!Fabcraft sold all the 9.3 stuff to J&S gear in Huntington Beach CA.Tom

[misterp266]

Fabcraft is still selling 9.3 stuff out of WY. Not sure who owns it now. Brad still sells some stuff from before he sold the business out of TX. He is 4speed427 on eBay.
I would say that a switch from a 2.69 to a 3.23 would not show enough improvement to make it worth while. I would go to at least a 3.42 as Mike did.
I ended up putting a 4.10 in my ‘63 Safari but I will be using a Richmond 5 speed with overdrive to compensate plus a 28” tire.

[stevep]

I am bringing a 3.42 single track and a posi to Norwalk to sell.

[FROGENGINE]

Originally Posted by stevep

I am bringing a 3.42 single track and a posi to Norwalk to sell.

Old post, but looking for posi for my 59 Catalina

[tom s]

I have a 3.90 pumpkin I took out of my Lemans.Heavy,can be shipped in a milk crate.I can get pics if you need to see it.I replaced it with a 3.64.You could just pull the axels,drop yours and put this in.Tom

[blueghoast]

Originally Posted by tom s

I have a 3.90 pumpkin I took out of my Lemans.Heavy,can be shipped in a milk crate.I can get pics if you need to see it.I replaced it with a 3.64.You could just pull the axels,drop yours and put this in.Tom

Tom is that a posi also? I'm looking for a posi for my 57-wagon it has
29-spline axle's and my gear ratio is a 3:64:1.

GT

[61-63]

Check with Fabcraft or Brad Duerst but I think ot is that the 2.87 and below are one carrier width, then up to 3.23 is another but that may be 3.42, then above that is the final width. Fabcraft has several ratio gear sets made new but all of them only fit the last carrier width. Thus if all you have is a 2.87 or higher gear you are stuck with it. But Fabcraft can fix you up with whatever you need to change to whatever gear you need.

[hurryinhoosier62]

Originally Posted by 61-63

Check with Fabcraft or Brad Duerst but I think ot is that the 2.87 and below are one carrier width, then up to 3.23 is another but that may be 3.42, then above that is the final width. Fabcraft has several ratio gear sets made new but all of them only fit the last carrier width. Thus if all you have is a 2.87 or higher gear you are stuck with it. But Fabcraft can fix you up with whatever you need to change to whatever gear you need.

As long as you have deep pockets…

[tom s]

It is a posi but 31 spline.Tom

[blueghoast]

Originally Posted by tom s

It is a posi but 31 spline.Tom

Yea I think I'm gona have a good time trying to find a 29-spline posi.
You still go to Norwalk anymore?

[tom s]

Don’t go anymore,too hard to get there now.Tom

[tom s]

More EZ to buy a 31 spline pumpkin and 31 spline axels .Tom

[PONTIAC LARRY]

i might sell my complete 64 GP 3.42 open rear (fits 63 as well) at least a spool fits that ratio also have a 60 Olds leaf spring perch 3.23 open rear complete and a 63 thats apart that was converted to bolt in a 55-59 GM truck that one comes with a 3.08 open chunk from a 59 , DFW TX area