GEAR RATIO

groots67pontiac · Member

GEAR RATIO

kelico · Poncho Master!

would be easier to count the teeth of the pinion and crown.. or.. see if it's stamped on the crown.
wouldn't advise welding her up either.. unless you plan on trailer to strip only.

and... Welcome to the site

pontiax · Poncho Master!

Welcome from another winnipeger, First, you would need to turn the driveshaft to get an accurate guesstimate to axel ratio. As turning the tire will turn the spider gears which will cut the ratio. This applies to open differentials. With a posi the tires will turn together, giving you a more accurate guess. As for welding the spider,NO NO NO, drivability on the street would be impossible. try calling Asperline transmission and differential, and see if the have a posi carrier, they may even have a good gear set for you. Spent money wisely now or repair and cuss later" usuallyon the side of the road".

rabbit64cs · Canadian Poncho Superstar!

NON posi diff. sounds like a 3.08 ratio.

I do it with the car in neutral , one wheel up , rotate the tire 2X, and count how many times the driveshaft spins. Gets you real close this way.

groots67pontiac · Member

Tks for the info on the gears I will be taking it apart on wed then I will know what i am dealing with. Will give Asperline a call and also r and r trans. We only welded the gears of an old derby car and it worked for that but you also her a lot of people talk about it. drive or push a pontiac is better then doing anything else. What about the powerglide the final will be a posi and about 373 gears and heavy duty u joint for summit or jegs and 350 500hp. some say that would be a good way and some say th400 but it is a console so it would be harder to get the linkage of the th400 to line up. Because of the shifter has only the two spots on it ( or just go with a 4spd )

67Poncho · Uber Guru

Take a look at this thread..... It will possibly help in your situation......

And no, now welding unless you want to go in a straight line for the rest of it's life! You need a "limited amount of slip" to be able to corner!

http://canadianponcho.activeboard.com/t50014091/diff-no-good-bad-or-ugly/

-- Edited by 67Poncho on Monday 23rd of July 2012 08:29:48 AM

427carl · A Poncho Legend!

groots67pontiac wrote:
Hi brand new member and I have couple of questions I need help with first. Gear ratio 1 full rotation of the wheel and 1 and half on the drive shaft does anyone that value. Should I weld up the rear carrier to get posi and put in 373 gears to kept the cost down for now it is a 12 bolt rear end. The 2spd powerglide would it be good on a 350 with about500hp And dont worry the virgin 327 is going in the front corner of the garage and stays with the car no matter what happens the her.

500 HP small block and Powerglide or 400?

I presume you are building a 4200lb race car???

if not biggrin

try 350HP with glide and 3.08's and have enough money for gas wink

groots67pontiac · Member

Tks for some info. I think it is going to be a posi and 373 just have to hide the final bills from my wife or just show her one of the lower ones. the engine is already built and ready to drop in it should make a good driver:)

4SPEED427 · A Poncho Legend!

groots67pontiac wrote:

some say that would be a good way and some say th400 but it is a console so it would be harder to get the linkage of the th400 to line up. Because of the shifter has only the two spots on it ( or just go with a 4spd )

I think there may be a company that makes a conversion to make your shifter correct with a TH400.

Blackheart4355 · Poncho Master!

Carl, my car originally came with a TH400 but has drive low1 low2 for the gear selector...so I don't think the shifter will be an issue

1965CS · Guru

Try shiftworks.com

4SPEED427 · A Poncho Legend!

That's the name I was looking for! Thanks!

groots67pontiac · Member

Hi tks for the name of shiftworks i will go with the turbo 350 now. I was looking a radaitors a lot of the ones on ebay look too good to be true does any one have one of these or do you know where is a good company. The ones from summit look not to bad and they come from a good company. The rear end I am going with a auburn or eaton limited slip and 373 gears that should make the old lady get up of the line and shock a few people lets hope

groots67pontiac · Member

tks i think it will be jegs or summit i got all my rear end parts from summit and they price match so that helps and they also send it to north dakota so i can go across the line and got them so i can save all the custom fees. I saw a fan shroud on ebay i am going to try and customize it to help with the cooling down I appreciate all the help that is coming in it makes it easier too work and get my pontiac on the road and not pieced together so THANKYOU VERY MUCH Lorne Groot