89stanglx

Lets say you had 3-4 sets of gears. 1 set 2.73, 1 set of 3.73, 1 set of 4.10 and a set of 4.51 or whatever just as an example.
Can you use a pinion gear from set one, to go with the ring gear from set 4 to get the desired ratio.I found a calculator that you input the teeth of each gear and it gives you the ratio but its not accurate. a 3.27 has 13 teeth on the pinion and 36 on the ring but the calculator said 2.77 wtf! Any info or links would be great.

Beer Rules

Panty_Peeler

You could but i wouldnt suggest it as it could and most likely would cause issues that could destroy the rear end.

I wouldnt go "REINVENTING" the wheel here the rear end and its componets arent a place thats forgiving and could be serious if something isnt set up right.

JUst use the ring and pinion that goes with the specified gear ratio you are trying to achieve.

89stanglx

Im not trying to REINVENT anything, im looking for facts. If you had two ring gears that both had 32 teeth and the difference was that one set pinion gear had 12 teeth and the other has 13 teeth than they would be interchangeable. Or is there some type of a pitch differnce between each set, thats what im wondering thx. Will they work set up correctly or would the mesh of the gears be unacceptable. Thx

mdvaldosta

I don't know if the teeth or depth size on the pinion are matched in any way to the ring gear, I suppose in theory it would work but if the gear and pinion don't mesh right they wont last long

vfast

you might if they were made by the same company..

89stanglx

Since i got you guys thinking lets say its race day and you want to go to the track but you want to drive your car on the highway next week and you have two seperate carrier assemblies one has the ring gear from lets say your stock 3.27 and the since your not changing the pinion gear for faster instalation you slap in you spare carrier assembally with the 4.50-4.70 ring gear or whatever this might give you a 3.90-4.10 final ratio. After racing you put your other carrier back in till you go to the track again a month or 2 down the road.It sounds good.Iether it will work or it will deff not, which is it lol, thx for the input

Mustangous

I dont believe that would work cause for a certain ratio the ring and pinion are made so they would fit in a certain rear they are made for with the least amount of shimming. Of coarse you have to shim it no matter what but just think of a ring and pinion from a 4.56. The ring gear is big in diameter and the pinion and really small in diameter. Now if you used a 2.73 (for example), if wouldnt be able sink in far enough in the rear (looking from the rear) to even allow the differental to fit all the way in. And vis versa, If you had a 4.56 pinion ( which is small) and a 2.73 ring gear, you would have to put a sleve in there for spacing just so the pinion would mesh with the ring gear. Then you probably wont be able to get the nut on the end of the pinion.

I guess a good way to explain it is to say you have 2 fixed gears in a spot that cant be moved (other than slight movement like shims). In order to make one gear bigger, the other would have to be smaller.

Hope this helps....

roundman

rear gear sets are hypoid gears and they are lapped together at the manufacturer so that they mate properly with each other and it is not a good idea at all to try to run different pinions and different ring gears together even if they came from the same ratio set of gears, much less two different ratio sets. it just ain't practicable to think about doing swaps like you propose. if you really wanted to do frequent rear end gear swaps, then you need to either get a Ford 9" rear where the entire center section comes out with the ring and pinion intact or the other type of quick change rear end whose name escapes me right now. Sprint cars use them, two gears under a easily removable cover and you just pull the cover and swap in new gears when you want to change the ratio.

89stanglx

Thx for the replies.