Lifted 6 inch...need new gears??

Breaking Habits · Jun 30, 2014

RedRice589 said:
Don't drive your truck in the rain?

My black platinum is show quality. And it's detailed in case someone wants to come to look at it so I'm not really trying to get it dirty to have to clean it again, too much effort

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RedRice589 · Jun 30, 2014

Jared @ River City Diesel said:
My black platinum is show quality. And it's detailed in case someone wants to come to look at it so I'm not really trying to get it dirty to have to clean it again, too much effort

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Lol I saw the ad. Forgot lol stop buying and selling just beat the hell out of one hahaha

Breaking Habits · Jul 1, 2014

RedRice589 said:
Lol I saw the ad. Forgot lol stop buying and selling just beat the hell out of one hahaha

That wouldn't be any fun. I beat my pulling truck on a weekly basis like a red headed step... Oh shoot sorry!

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Animosus · Jul 1, 2014

jcain · Jul 1, 2014

That isn't accurate for our transmission gearing.

dseitler · Jul 1, 2014

I'm guessing that's at 65 MPH. You would have to Do the following to figure your RPM for a 2011 and up SuperDuty

RPM X.67 6th gear @ 65mph
RPM X.86 5th gear @ 65mph

bricewise · Jul 1, 2014

dseitler said:
I'm guessing that's at 65 MPH. You would have to Do the following to figure your RPM for a 2011 and up SuperDuty

RPM X.67 6th gear @ 65mph
RPM X.86 5th gear @ 65mph

I'm not quite sure I understand the formula your giving.

Is it RPM X .67 = 65? If so 65/.67 is like 97 something.

dseitler · Jul 1, 2014

I'll just pic a number or RPM

Gear ratio is 3:55 with 33" tires = 2349 RPM

Say you want 6th gear but you have to divide in the final ratio output of the transmission to get you true RPM at 65 MPH. In this case it's .67 The chart is based on 65 MPH.

2349 times .67 = 1573 This should be your RPM at 65MPH with 33" tires in
6th gear

2349 times .86 = 2020 This should be your RPM at 65MPH with 33" tires in
5th gear

azdbllung · Jul 1, 2014

Im assuming that chart is way off?? Doesnt look correct to me

RedRice589 · Jul 1, 2014

Jared @ River City Diesel said:
That wouldn't be any fun. I beat my pulling truck on a weekly basis like a red headed step... Oh shoot sorry!

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:blitzed: I'll put lotion on your door handles.......

dseitler · Jul 1, 2014

azdbllung said:
Im assuming that chart is way off?? Doesnt look correct to me

You would have to go to your tire manufacture website to see the actual overall diameter of the tire you are running.

LovinPSDs · Jul 1, 2014

azdbllung said:
Im assuming that chart is way off?? Doesnt look correct to me

Way off... I run 3.73's and 37s on my 6.4 and I'd like to have 4.10's if they would just magically appear! I the mean time I get by with what i've got.

My input isn't as useful as you have an extra gear also...

Jesse_01 · Jul 2, 2014

So if 4.30 for 37" is the ticket. Would 3.73 & 35" be a nice fit? I can get front and rear done for $1000 otd with ford gears. Trade my diffs for a gas f350 3.73 diffs with half as many miles.