SiGGa

I've got an 89 5.0 automatic, i was wondering what speed you're going at 3250 and 2750 RPM in top gear


I lost my speedo about 2 weeks ago and haven't gotten around to fixing it or even lookin thru junkyards for the speedo transmission gear..

anyway i noticed i feel real comfortable cruisin around 2750RPM and even though it dont feel that fast 3250 feels pretty fun for stretches where i dun have to worry much about traffic

Anybody know what speeds these would be? i hadn't learned anything but the speed at gear changes till now lol

Peace

Blaze86Vic

Have to know what rear end gear you are running, and would increase accuracy to know what size tires. But the rear end gear ratio is a must have.

SiGGa

whoops srry forgot to mention that :P

i have the stock Highway gears (the 140 mph speedo) i've got the 15 inch rims, too. .. actually i think they're the same rims u got on you're vic

Dam i forgot to check back for a LONG time O_o

rmodel65

i cruz at seventy a little under 2000 so u r going much faster at 2700-3200

nitrous_bob

you need to look at your door tag....ax code

m=2.73
z=3.08
e=3.27

and rim size doesn't matter....tire size.......if they are stock tires they are about 25 1/2" tall

90GTRagtop

In my '90 GT Automatic all stock with 2.73 rear gears and 225-60-R15 tires (stock size), at 2000 RPM I'm running 82 mph. Based on that at 2750, I'd be running almost 113 and with the same setup except for having 3.27 differential it would be running aroun 94. Check the chart below for comparisons based on my stock setup. Sorry for all the dashes, but tabs and spaces don't work so well in this HTML without a deal more effort than I'm willing to put in this early.

RPM--------MPH--------Rear End Ratio
2000-------82----------2.73
-------------72.7-------3.08
-------------68.5-------3.27

2750-------112.75-----2.73
-------------99.9-------3.08
-------------94.1-------3.27

3250-------133.25----2.73
------------118.1------3.08
------------111.2------3.27

SiGGa

yeah i've got 225/60/r15's, and my rear end is a 2.73 :P

No freakin' wonder 3250 felt fun haha

thanks for all tha help people
oh, dude where did you get those numbers from? thats awesome

90GTRagtop

Numbers are simple math, just did the calculations. Note that the speed I noted on my stock setup is in overdrive with the torque converter locked. At higher speeds, I'm not sure if the lockup maintains in the torque converter, and if not there will be some extra slippage that would result in a lower MPH for the given RPM.