Need help with gearing problem

[ms93gt]

Ok I have a 93 Gt and at 65mph I am driving at 2500 rpms, Now I checked the tag on my axle cover and it says I have 3:27. I spun the tire and counted the driveshaft and it also came out to 3:27, but my car was originally an aod and I swapped it into a 5speed. I didnt change the speedo gear but I don't believe my speedo is off. What could be my problem for taching so high on the parkway, is my 5th gear real short? Do I have diff gears and maybe I miscounted the driveshaft? Or could my tps be off?

 

[ms93gt]

anyone

 

[squeeeg]

What transmission did you use in the swap? I wouldn't really worry about it id you sig is still going to happen about getting the 3.55's just change the speedo gear then and everything should be ok

 

[ms93gt]

i put a 93 world class t5 in

 

[tjm73]

What size tires do you run? ex: 225/60R15 or 275/50R15

 

[tjm73]

I think your speedometer is off. 1993 AOD's had an 8 tooth output gear for the speedometer cable. Depending upon which year tranny you swapped to it could have a 7 tooth output gear. If it is a Z spec T5 it has a 7 tooth output gear.

In about 1989 (I think) the T5 changed to an 8 tooth output gear which would make your speedometer correct as it is right now. I suspect you have an '88 or earlier T5, or a FRPP T5, with a 7 tooth output gear.

 

[ms93gt]

I'm running stock sized tires, 225 55's all around. The guy I bought the tranny from claimed it was a 93. I ran the tag and I believe it came out to either a 90,91, or 92, but I wasn't worried because they're all rated for 300ft lb's of tq. (I didn't want an 87-89 bc of the lower tq numbers)