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1_slo_92
06-13-2007, 01:08 AM
I have in my 88 mustang Gt It seems as if it is geared high (55mph sitting around 1700 or so. I want to daily it so maybe I should swap in some 3.73's?

Also what is the next step up from a 3.73?

Thank you in advance.

dedpedal
06-13-2007, 07:32 AM
Jack it up and mark the tire and the driveshaft. Count how many turns the shaft makes to complete one turn of the tires. 3 1/2 turns =3.55 gears, 3 3/4 turns =3.73. 4 turns is a 4.10 and 4 1/4 is 4.30s.

Jeff88coupe
06-13-2007, 09:11 AM
http://bbs.hardcore50.com/calc/?mode=speedforrpm

That is a link to a rpm/speed calculator...just have to know your tire height and trans gear ratio (in a t5 isn't 5th .8?).

Katmandu
07-06-2007, 08:12 PM
Also what is the next step up from a 3.73?

3.90s.

What type tranny have you got ? :confused:

1_slo_92
07-10-2007, 10:11 AM
T-5, hoping to build the heck out of the car so im sure it will change eventually.

mustangrfast88
07-10-2007, 10:14 AM
i would say 3.73 or 3.90 or 4.10 but wouldnt go much more then a 4.10 for daily driving

slvr87cpe
08-02-2007, 01:52 PM
what is the gear ration for 4th in a t.5

Black Hole
08-02-2007, 02:10 PM
what is the gear ration for 4th in a t.5
1:1 right?

That's why you dyno in 4th gear....

Katmandu
08-02-2007, 03:55 PM
1:1 right?Correct. :bigthumb

ADaughen
08-02-2007, 04:58 PM
How do you figure out what gear ratio you have when you don't have any axles? :p

Dirtyd0g
08-02-2007, 05:11 PM
How do you figure out what gear ratio you have when you don't have any axles? :p

Take it apart and count the gear teeth....