Hello guys, just trying to work out my ratio for my rear end. With two full turns of the rear wheel, the prop shaft turns 3 and 1 third turns. Does this mean I have a 3.33 ratio? If so, I can find nothing online to suggest that a 12 bolt comes in that ratio?
Please help!!
Ian
UK
If you are trying to find out the ratio with that procedure, generally, 1 rotation of the rear wheel and count the turns of the pinion... If we 1/2 this, I would say, roughly 3:07 ratio... Easier way is to look at the axle code jut left of the center pumpkin on the forward side of the passenger axle tube.... There will be a 2 digit code, "EM" for example, if it is an 8.875 3:07 ratio.... I will get pics for you....
Yes, the axle code should be stamped on the passenger side axle tube, about 2-3 inches away from the cast iron center section. The stamping should be facing forward, but sometimes a little more towards the top. You might need to do a little cleaning with a wire brush, but it'll be there. Once you find the code we can decode it.
Nope, that's not it. What you're seeing is some casting information on the center section.
What you're looking for is stamped (with a punch) into the passenger side axle tube, a few inches from the center section. We had to fly someone through this before, they found the stampings more towards the top, but they did find them. The letters/numbers will be about 1/4" high. There will be 7 or 8 letters/numbers, and which will include letters for the differential code, numbers for the date code, and a final letter for the plant that put the diff together.
Had to move my '67 Strato so I decided to bring it in the shop to give you a real time example... This is a 250ci, 3-on-the-tree car... (I forgot what axle was in this one)
Agreed, but 3.36 was not available in any Canadian Pontiac (Chevrolet style) 12 bolt as far as anything I've ever seen or experienced, and he says he has a 12 bolt.
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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles
1966 Grande Parisienne, 396 1 of 23 factory air cars
Thanks again for your help on this! Once we've sorted it out, I'll let you know why I need it. Don't wanna let it go just yet or it'll take the thread off on a massive tangent for sure!!
Oh, I don't suppose it matters that mine is a RHD export model by any chance does it?
1956 Pontiac Pathfinder 2dr sedan, 496 - dyno'd 545 hp, stick shift, 4.11 posi - Hot Rod
