Hey guys, I was wondering at what speed my engine would be turning at 60 mph in 5th gear with a T5 tranny with a .73 overdrive gear with a 3.42 rear end. Would that combo still result in a car that will get reasonable mileage on the highway? That's what I'm thinking of using to replace the 700r4/2.73s my car has now.

 

im not sure what my t5 5th gear is so im not sure how much help this is to you. but i have a 3.42 rear end.

2000rpm is 81mph on mine
60 would be about 1500

 

I guessed at your tire size with 26.5" somthing.. I used this http://www.wallaceracing.com/gear-speed.php

Engine Speed
(RPM) (MPH)
8000 RPM 253.58 MPH
7500 RPM 237.73 MPH
7000 RPM 221.88 MPH
6500 RPM 206.03 MPH
6000 RPM 190.18 MPH
5500 RPM 174.33 MPH
5000 RPM 158.49 MPH
4500 RPM 142.64 MPH
4000 RPM 126.79 MPH
3500 RPM 110.94 MPH
3000 RPM 95.09 MPH
2500 RPM 79.24 MPH
2000 RPM 63.39 MPH
1500 RPM 47.55 MPH
1000 RPM 31.70 MPH

 

Look up the formula and DIY instead of asking some one else for the answer. A very simple math solution.

 

Ended up doing this a long time ago when I wasn't sure that I either had or could get the right speedo gear... For a T-5 having a .76 5th gear, I run around 2036 RPM@60. Should be around 1950-2000 for you.

 

3.73 / .63 fifth works well.
It might be worth it to try changing 5th when you change the rear.

 

Thanks bud.



I suppose, I have the stock 16" crosslace rims with stock size tires. Can't remember the exact size but thank you so much for that chart! Very helpful. And thanks to everyone else who posted! This should give me a solid idea of what to expect and so far I like what I see. That little calculator you posted up is very handy too.

 

Try the calculators here too:

https://www.thirdgen.org/calculations