Thread: Advice 3.75 gears

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I had no idea that you could get both 3.73 (41Ring, 11Pinion) and 3.75 (45Ring, 12Pinion) for the same carrier sizes. I thought that they picked one or the other for a given rear differential. Guess I learned something today, and I agree 100% with Charlie, you'll never notice any difference between the two. The bigger pinion gear may be a little stronger as it spreads the load over a bigger circle.

Like Roger, I never knew there were lots of different gear ratios available other than the standard 3:70, 4:11, 4:30, etc. But when we ordered the rear ends for my 27 and Dans rpu the guy offered stuff I had never seen, like 4:00, etc.

But as far as your original question, you won't notice a bit of difference between the 3:73 and 3:75.

Don

Originally Posted by rspears

I had no idea that you could get both 3.73 (41Ring, 11Pinion) and 3.75 (45Ring, 12Pinion) for the same carrier sizes. I thought that they picked one or the other for a given rear differential. Guess I learned something today, and I agree 100% with Charlie, you'll never notice any difference between the two. The bigger pinion gear may be a little stronger as it spreads the load over a bigger circle.

The pinion gear isn't really any bigger with this small a differance in gear ratios--true one more tooth but diameters are pretty well set by the numerical ratio--

The teeth are different size and shape between these ratios and the 12 tooth pinion will have smaller teeth---In some ratios, there is a bigger differance in tooth size as sometimes there will be 2 or more differance and that will be pretty significant