Calling anyone with 4.10's

1996GT · Mar 1, 2011

I thought i was running 4.10's in my 96 but now im not so sure. The previous owner said he installed the gears so i never questioned it since it feels like 4.10's.
My speedometer is off so i dont know exactly how fast im going. But when im driving to work at night i can read the digital display on the newer cars and heres what im getting, 5th gear- 2000 rpm - 67 mph roughly - 265/35/18's.
Does that sound right for these gears? Ive checked a couple of gear calculators and it doesnt match. I havent counted the turns on the driveshaft yet but thats next, just needed some quick feedback from you guys.

mygreengt · Mar 1, 2011

doesnt sound right to me, but i had 4.10s in an auto

BigTang · Mar 1, 2011

3.27s? 5th is .67 right?

put it in 4th (1:1) and drive next to your friend at 2500 rpm, call him and ask him how fast. simple.
from there go here and work backwards:
http://www.f-body.org/gears/

1996GT · Mar 2, 2011

thanks for the input guys. I'll check the fourth gear tip this weekend. Its just one of those things that u need to get to the bottom of. It sure fels like it has 4.10's but then maybe its had some work done.

Mystic SVT · Mar 2, 2011

Nope, thats not 4.10s. My car when it had 3.27s at 70mph I was turning roughly 2100 rpm.

MustangChris · Mar 2, 2011

nope. not 4.10s.

get under the car. rotate the tire 1 full revolution. count the revolutions of the driveshaft.

~4 driveshaft turns to 1 wheel turn = 3.73s/4.10s.

(hense 4.1:1)