RPM Question

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Mar 27, 2010 | 10:12 AM

B1DU5

Thread Starter

1st Gear Member

Joined: Apr 2008

Posts: 61

From: Michigan

RPM Question

So Im trying to figure out what rear end i have in my 03 GT. What RPMs do you guys usually run doing 75 mph in 5th gear, and with what rear end? Thanks

Mar 27, 2010 | 10:56 AM

cliffyk

TECH SAVANT

Joined: Dec 2006

Posts: 10,937

From: Saint Augustine, FL

Here's my "How Fast can I go in each gear?" calculator...

Quick answer (these all assume stock rear tire diameter):

with 3.27 (stock) gears 75 mph ≈ 2100 rpm
with 3.73 gears 75 mph ≈ 2400 rpm
with 4.10 gears 75 mph ≈ 2620 rpm

Mar 27, 2010 | 11:27 AM

SeanAndKate

3rd Gear Member

Joined: Nov 2006

Posts: 527

From: Chicago

cliffy is it just me or does the "how fast can i go in each gear?" not work for the 4R70W? when I try to select it, it just stays on the last trans I had selected...

Mar 27, 2010 | 11:35 AM

cliffyk

TECH SAVANT

Joined: Dec 2006

Posts: 10,937

From: Saint Augustine, FL

Quote:

Originally Posted by SeanAndKate

cliffy is it just me or does the "how fast can i go in each gear?" not work for the 4R70W? when I try to select it, it just stays on the last trans I had selected...

Thank you for reminding me of that!

It had been on my to-do list but got shoved to the back burner--all fixed...