Trying to figure out what gears...

[1_slo_92]

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]

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]

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]

Also what is the next step up from a 3.73?

3.90s.

What type tranny have you got ? :confused:

[1_slo_92]

T-5, hoping to build the heck out of the car so im sure it will change eventually.

[mustangrfast88]

i would say 3.73 or 3.90 or 4.10 but wouldnt go much more then a 4.10 for daily driving

[slvr87cpe]

what is the gear ration for 4th in a t.5

[Black Hole]

what is the gear ration for 4th in a t.5
1:1 right?

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

[Katmandu]

1:1 right?Correct. :bigthumb

[ADaughen]

How do you figure out what gear ratio you have when you don't have any axles? :p

[Dirtyd0g]

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....