3.00 gears revs 3000 at 70mphs?

[LimeLight]

Ok so I bought a fully restored 65 GT Fastback. The engine is working and sounds great. The only problem was that my speedometer was off by about 15 mph and it was reving very high, 3000 when i was at 55mph. So I checked the gear ratio and it was a 3.20. I put a 3.00 in and now it revs 3000 at 70mph. It has a 3 spd automatic transmission in it. I can feel it shifting through all gears, but should it be reving this high at only 70mph in 3rd gear?

 

[iskwezm]

yeah,thats about right if you have "short" tires

 

[jbuening]

I agree. I have around 215/70/15 tires and i run around 3k rpms @ 70mph. I have an FMX 3 spd auto, but they are all geared the same in 3rd (1:1). If you have confirmed the speed driving next to another car (via cell phone), then your speedometer may have not been that far off. You gearing may have increase your speed 5-10mph, but probably not 15mph at the same rpm.

 

[LMan]

sounds like you are hearing the siren song of overdrive

 

[Tim65GT]

I have 3.00 with a C4 and 225/60-14's and it to0 is at 3000 RPM at 70 MPH.

An AOD is in my future plans.

 

[mudbilly]

bump

http://forums.stangnet.com/showthread.php?t=598578

 

[KillerKittyCat]

I have the four speed with 300's and turn 2700 at 70 mph.
Fourth is 1 to 1. I checked the ratio based on my stock setup and the 2700 number is correct with 14 inch tires.

However the 2.92 first gear makes it go!!!!

 

[KK6695GT]

3000 @ 70 sounds like it's in the neighborhood. Depends on your tire diameter. My '66 w/ 205/70/14s runs 2980 RPM @ 70 w/ 3.25 gears.

 

[Ronstang]

I have a 3.98 gearset in the Shelby with 225/60-14s....you are lucky at 70 mph.