Just Bought A 1997 Mustang Cobra But Cant Tell If I Have 3.73 Or 4.10?
guy that sold it me dont know if they are 3.73 or 4.10?i think(and hope) they are 4.10.i do 80mph at 2800-2900rpm in 5th gear?anybody with 4.10 in his/hers cobra? thank you
i have 4:10s i think i at 60 ish in 5 at around 2000-2500 but i dont remember. my car is off the road right now.
best way to be sure is jack up the rear end both tires off the ground. make a mark on the tire and on the driveshaft. you need two people to do this. have one rotate the driveshaft (trans in neutral) and one watch the tire. count how many rotations of the driveshaft per each one of the tire rotations. if 4 plus than you have 4:10s or more if under 4 than smaller than 4 somthings.
i think thats right. anybody else want to add or correct me.. its been awhile since i did it that way.
hope that helps.
If you have stock tires 245/45 17 and the stock Tremec T-45, with 4:10 rear end gears. You will be turning 2876 rpm @ 80 mph. Check out: The Mustang II Organization
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98 Chrome Yellow Cobra SVT Coupe, C & L Bullit CAI, K & N FIPK , FRPP 4.10's, Steeda Tri-AX, MagnaFlow Catted X-pipe, MagnaPack Catbacks.
Using the Mustqang II calculator with 275/45 17's and stock tranny I came up with 2695 rpm for 4:10's at 80 mph. If you have 4:3's with the 275/45 17's your RPm at 80mph would be 2897. So maybe you have the 4:3's.
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98 Chrome Yellow Cobra SVT Coupe, C & L Bullit CAI, K & N FIPK , FRPP 4.10's, Steeda Tri-AX, MagnaFlow Catted X-pipe, MagnaPack Catbacks.
The 2.77 you got confused me too at first, but the calculator assumes you don't have overdrive, fifth gear in our Cobras is actually an overdrive at .67 to 1. I used the RPM calculator and put in your tire diameter with the .67 as the Trans gear ratio and 4:3 rear end ratio at 80 and it came up 2897 rpm.
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98 Chrome Yellow Cobra SVT Coupe, C & L Bullit CAI, K & N FIPK , FRPP 4.10's, Steeda Tri-AX, MagnaFlow Catted X-pipe, MagnaPack Catbacks.
Ive Got 410's In My Car And At 80 Mph Im Right At 3k Rpm's Ive Got 275 40 17's On The Car, Not Sure If It Helps Any But I Would Just Check To Make Sure
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1996 SVT COBRA, SLP X-PIPE, MAGNAFLOW CATBACK, STEEDA UNDERDRIVE PULLIES, JLT INTAKE, ACCUFAB THROTTLEBODY, VENOM 24# INJECTORS,PERFORMANCE DISTRIBUTORS LIVEWIRES AND COILPACKS,KING COBRA CLUTCH,STEEDA TRIAX SHORT THROW SHIFTER,STEEDA CLUTCH ADJUSTER,4.10 GEAR, SCT 4 BANK PERFORMANCE CHIP,2003 COBRA CALIPERS, HAWKS BRAKE PADS, POWERSLOT SLOTTED ROTORS, 17" COBRA R'S WITH SUMITOMO TIRES. LOTS MORE TO COME
Just Bought A 1997 Mustang Cobra But Cant Tell If I Have 3.73 Or 4.10? 
