Thread: Buying a new 9 inch 3rd member. What do you recommend?

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Do you have an idea of how many rpm you want to turn?
You'll need to know the OD of the rear tires too. Are you staying with what looks like slicks in the rear?
I don't know if you've posted what cam the motor has because you'll need to stay in the working range for the cams rpm ..
There are many estimators online. drop in the tire size and the gear selection and it'll tell you the rpm you can expect.

Originally Posted by 34_40

Do you have an idea of how many rpm you want to turn?
You'll need to know the OD of the rear tires too. Are you staying with what looks like slicks in the rear?
I don't know if you've posted what cam the motor has because you'll need to stay in the working range for the cams rpm ..
There are many estimators online. drop in the tire size and the gear selection and it'll tell you the rpm you can expect.

Not sure of RPM. I replaced the slicks with 275/60/15 tires which I believe are 28 inches tall. I do not know the cam numbers as engine was put in by previous owner. I think I will stick with 4:11 as I won't be doing a lot of HWY time in this truck. Around town. on weekends and shows but no long trips.