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Determine gear ratio

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Determine gear ratio
chuzie Offline
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#3
07-12-2009, 05:09 PM
I haven't yet. This is not the original axle, that was made clear to me when it was purchased.

What are you running?

I definitely want to get 4.11 or 4.56. Here are the numbers I crunched (35" tires w/C4).

3.54 - 60 MPH - 2000 RPM 3.52 - 70 MPH - 2400 RPM.
4.11 - 60 MPH - 2400 RPM 4.11 - 70 MPH - 2800 RPM
4.56 - 60 MPH - 2600 RPM 4.56 - 70 MPH - 3100 RPM .

I need to retain the ability to drive this puppy to events since I don't have a trailer. The question now will be is 2600, 2700, or 2800 RPM considered OK for extended periods like highway driving? Also, are 4.11 suitable for crawling considering I am running 302/C4/D20/35"tires?

Chuck made the comment yesterday that having brakes that work are nice but using gears to crawl down a hill is nicer. I don't even know if that is possible with what I am suggesting but something to consider.
'77 351w- Explorer EFI, 4R70W, 4-link, lockers, 4.56, 35" MT/Rs with a severe rock addiction.Confusedmokin:
Roads? Where we're going, we don't need roads.

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Messages In This Thread
Determine gear ratio - by chuzie - 07-12-2009, 01:59 PM
Determine gear ratio - by bucketobolts - 07-12-2009, 04:26 PM
Determine gear ratio - by chuzie - 07-12-2009, 05:09 PM
Determine gear ratio - by Timstrk - 07-12-2009, 06:21 PM
Determine gear ratio - by chuzie - 07-12-2009, 07:55 PM
Determine gear ratio - by bucketobolts - 07-12-2009, 10:15 PM
Determine gear ratio - by chuzie - 07-13-2009, 08:39 AM
Determine gear ratio - by johnpaulgolf - 07-13-2009, 08:42 AM
Determine gear ratio - by SC74 - 07-13-2009, 08:58 AM
Determine gear ratio - by chuzie - 07-13-2009, 03:38 PM
Determine gear ratio - by johnpaulgolf - 07-13-2009, 04:03 PM
Determine gear ratio - by broncomatt - 07-13-2009, 05:05 PM
Determine gear ratio - by chuzie - 07-13-2009, 05:16 PM
Determine gear ratio - by bucketobolts - 07-13-2009, 07:22 PM
Determine gear ratio - by chuzie - 07-13-2009, 08:46 PM
Determine gear ratio - by bucketobolts - 07-13-2009, 10:00 PM
Determine gear ratio - by chuzie - 07-13-2009, 10:08 PM
Determine gear ratio - by bucketobolts - 07-13-2009, 10:15 PM

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