To high rmp?

FordTruck · Post by **FordTruck** » Mon Oct 22, 2012 8:31 pm

Ive got a 70 f100 302/c4 and at 45mph its running about 2k does that seem right? I can feel it shift 1-3 by 30 im high gear. Olny thing not hooked up is the kickdown.

BobbyFord · Post by **BobbyFord** » Mon Oct 22, 2012 10:15 pm

What is your rear end ratio?

FordTruck · Post by **FordTruck** » Mon Oct 22, 2012 10:25 pm

i think its 4:10 or 4:11 theres not tag so im not a 100% sure

BobbyFord · Post by **BobbyFord** » Mon Oct 22, 2012 10:31 pm

You can always decode your warranty plate for the original gear ratio. A taller rear gear will lower your final drive rpms.

FordTruck · Post by **FordTruck** » Tue Oct 23, 2012 9:30 am

i believe the rear end was changed cause its a 9 3/8. i also got 295/50/15 on the rear

Donnie · Post by **Donnie** » Tue Oct 23, 2012 1:19 pm

What is the distance from the ground to the top of the tire.? I posted before, the method used to find your rear end ratio if it has been changed & all tags are missing or inaccurate....The moderator can guide you to this info.........post back your tire measurement & someone will help you...Donnie

BobbyFord · Post by **BobbyFord** » Tue Oct 23, 2012 3:51 pm

What is the axle code on your warranty plate?

FordTruck · Post by **FordTruck** » Tue Oct 23, 2012 4:31 pm

BobbyFord wrote:What is the axle code on your warranty plate?

it says axle 08

BobbyFord · Post by **BobbyFord** » Tue Oct 23, 2012 6:48 pm

08 is a 3.50 ratio.
The fact that you have no tag on your diff suggests that its not the original rear chunk

elgemcdlf · Post by **elgemcdlf** » Tue Oct 23, 2012 8:35 pm

My 3.55s turn 2400 at 55 mph.

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