Wow!!!

[DaJoker]

Had 3.73's installed to replace the factory 2.73's in my vert and I'm impressed. I really DON"T like 2600rpms at 70 mph but around town it's perfect. Had to do some research about cruising rpms cause I coulda swore it was 4.10's or lower in there. Can't wait to do some track testing!!!!:burnout::burnout::burnout:

 

[93LITE]

I think you might be way off, did you change the speedo gear in the trans? I had a 90 that I changed from 3.27's to 3.73's and what I can remeber, 70 was about 2000 rpms. 2600 rpm would put you around 90. You need to find a calculator on the net and check that out. Just and idea.

 

[DaJoker]

Speedo gear was changed. I researched rpms at 70 on a few websites and they all had 2600 rpms for 73's and 2800 for 4.10 gears.:shrug: I do intend on checking my speedometer as it was off when I had the stock gears. Believe me I was PISSED when I picked up the car cause I swore it had 4.30's. My 86 had 73's and it was nothing like this car but back then I never drove 70mph anyway, speed limit was 55 or 60 then.

 

[93LITE]

What size tires are you running? I'd keep checking, still doesn't sound right? Good Luck!

Corral RPM / SPEED / GEAR Calculator
Engine RPM: 2600
Vehicle Speed: 81.2102274245321
Read End Gear: 3.73
Stock tire size

 

[DaJoker]

I checked that calculator too and it shows the gear to be a 4:16 but others when I did a search show differing results:shrug:. Guess its gonna be off the ground to check the driveshaft rotations.:nonono:

 

[DaJoker]

Got under the car just now and the driveshaft turned 3 and 3/4 turns for one tire rotation. Guess its 3.73's...........maybe the t5 is not the original that came in the car originally.

 

[Stopsign32v]

Mine with 3.73s was definately not friendly on the interstate. I had to keep it down to around 60mph-65mph to keep it around 2,000-2,500rpms. Sounds right to me. When I installed them I thought to myself "There is no way you could do alot of interstate driving with 4.10s!"

 

[DaJoker]

Mine with 3.73s was definately not friendly on the interstate. I had to keep it down to around 60mph-65mph to keep it around 2,000-2,500rpms. Sounds right to me. When I installed them I thought to myself "There is no way you could do alot of interstate driving with 4.10s!"

x2 I don't think I would ever put 4.10's on a street car unless it was an AOD. I bought the Mustang as a runaround car, to drive to the track and what not, but with these gears its now a city car!

 

[DaJoker]

I think you might be way off, did you change the speedo gear in the trans? I had a 90 that I changed from 3.27's to 3.73's and what I can remeber, 70 was about 2000 rpms. 2600 rpm would put you around 90. You need to find a calculator on the net and check that out. Just and idea.

Just used my GPS and my speedo is way off. At 70 on the speedo I'm going 77mph, and at 70 mph I'm still turning 2400-2500. Now I get to try to find the correct gear for my speedo as I've heard there is no exact replacement for this gear.:??:

 

[vincendebbie]

Hey Joker

Hey J it's Vince here. Remember the weekend of the Show at Banner? I put in my 3:73's and changed the speedo gear to the black 23 tooth. My speedo is still off by 7 to 8 mph. But with my wife next to me doing 70 I am at 2300 rpms. I am running 215/60/16 tires on the car. According to the speedo gear calculator I should be dead on with the speedo. I have actually gotten better gas mileage with the 3:73's. I drive from the Southshore to the Northshore every day. I am going to try and be out at the Lake tomorrow. Hope to see you there. If you have any questions PM me.:coolman::rockon::burnout: