Thread: 3.29s into a 4T65-HD?

You'd need the diff, bearing, spacer, diff cover and a longer axle. You'd be compromising the strength.

Diffs are pretty cheap overall. But if you have an HD, the diff is already a 3.29. The change you would have to do to get the 3.29 ratio is to change the drive and driven sprockets from 37/33 tooth counts to 35/35 counts.

To do that, you'd basically be pulling the trans and doing a lot of work. It's much mroe than a diff swap in your case.

Originally Posted by BillBoost37

You'd need the diff, bearing, spacer, diff cover and a longer axle. You'd be compromising the strength.

Diffs are pretty cheap overall. But if you have an HD, the diff is already a 3.29. The change you would have to do to get the 3.29 ratio is to change the drive and driven sprockets from 37/33 tooth counts to 35/35 counts.

To do that, you'd basically be pulling the trans and doing a lot of work. It's much mroe than a diff swap in your case.

Thanks.

I do already have an HD, so, if it craps out than I'll change, but otherwise I'll leave it.

Funny part here is when I reread this post ... Nick was right all along. He didn't explain it, that's all. He said it right from jump.