Getting ready to order gears

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Mar 10, 2005 | 02:18 PM

#11

CAMMIN03'

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From: Athens, GA

Quote:

Originally Posted by mzoomora

I would run a 4.10 with a 28" tall tire for performance. The 3.73 would make it a slightly better driver though. 4.10/ 28" tire- you would be looking at 3000 rpm highway roughly.

I have 4.10's with a 28in tire and I cruise on the highway at 70-75 at roughly

2500-2600

Mar 10, 2005 | 03:44 PM

#12

mzoomora

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From: Chicago, Il

Quote:

Originally Posted by CAMMIN03'

I have 4.10's with a 28in tire and I cruise on the highway at 70-75 at roughly

2500-2600

That is why I say roughly. I almost always cruise on the highway at 80-85, hence higher RPM. A lot of charts always show RPM at 55, and who does that?
(80mph x 4.10) / 28 x 336 = 3936 divided by your O/D ratio, .70= 2755. There is going to be variance from converter slippage and tire growth or inflation. I didnt do the formula the first time, just went off of experience from cars with similar set-ups. It is not that bad, and you have good throttle response on the highway also.