04blackGT

Alright i ran a search and just couldnt find a specific enough answer so could anyone help me figure out what my rpm's would be if i swapped to 4.10's going 75 or 80 mph. i have a 04 GT Auto. thanks for the help

mdvaldosta

Ahh shiz I got a 5sp and Im about 2600 @ 75mph ... can't tell ya about an auto though but it's a tad higher

97STANG

i am pretty sure you have the same ratios in your tranny as mine.(4r70w wide ratio). When i am going 70 my speedo reads 90. I dont have my new speedometer gear yet. My rpms are about at 2600/2700 or so i wanna say... I dont really go faster than that on the high way just cuz i dont want the motor constantly revving at 3000. So i cant tell you for 75/80. I never had anyone drive along side me for that speed. Hope this helps......