Poobs

Anyone know how to figure out what my gear ratio is from the tach reading and speedo reading?

I bought a used 98 GT and would like to know if the previous owner changed the rear end ratio.

I get 60MPH at 2000 RPM

Thanks

radonovan

Try this:
http://www.linktrek.com/Transmissions.xls

JonBeast

Hahaaa, I'm glad we are on the same page [8D]

Dan04COBRA

Pre-99 Automatic GT's can use a Speedcal from Abbott or Dallas Mustang, 99+ GT's need to purchase a tuner to adjust the speedo, for automatics...

Due to different transmission gearing, it is best for 96-98 Manual GT's to have 3.73 gears & Auto's to have 4.10 gears.

For 99+ Auto GT's 4.10 gears are the best bang for your buck, for 99+ Manual GT's your best gear selection will be 4.10's at a minimum, as the tranny gear ratio was slightly altered for slightly better gas mileage.

I have 4.30 gears. At the track, with my mods, I was near redline in 4th gear, which is good. With some taller, stickier tires I will make maximum use of my gears.

Hope this helps some more.

Albizo66

Well I have 4:10's in my baby..and shes one strong *** pony..and when I wanna race..then 1st gear is used just for a launch...1st gear in Mustangs doesn't do too much for you anyways..2nd and 3rd are strong as ***** in stangs and that's where I win my races..1st gear won't decide a race for you..unless you totally f*ck it up..

and according to my Uncle: "1st gear should never serve a purpose other than launching in ANY type of muscle car. Period." haha hes a definat man

mustanggt04

alright well i dont understand y i would need 2 get a tuner 2 fix my speedo i bought the 3.73 gears and i am putting them in tommoro 2day same thing its 5 am wats the eziest way 2 correct my speedo and wat did u say about shift points?

ajspellm

are there any posts on how to install gears? my dads friend is a mechanic and thinks it is going to be alot of work. so i want to get a post with a how to and decide whether or not to have it taken to a shop. thanks

NXgt

No one ever mentions 3.90 gears. Whats wrong with them?

Fallstar01

Nothing at all.

98bluecobra

i have a stock 98 cobra and am hearing that i should change the gears to add power?? any ideas??