I just bought a 2008 Mustang Gt and the speedo was off and so I had been trying to figure out why and it came with a tuner and so I decided to tune for gear ratios and got to 4.10 and now the speedometer is correct.. at 70 mph in 5th i'm right at 2400 rpm, 80 close to 2800-2900.. first gear is also EXTREMELY short. so I was wondering if any of yall think that sounds like 4.10s before I take the time to get out in this 100+ degree weather and jack it up to see.

 

4.10s at least. I think American Muscle has a rpm table on there sight. Look up 4.10 gears and I think it's on that page. Doesn't seem like I'm quite that high at 70. But I'm going to say yes to 4.10s.

 

k cool.. thats what I thought but thought id ask

 

Sounds like 4.10's. If you can leave a stop in 3rd gear (manual) it's at least 4.10. What tire size do you have? I can give you a table. Auto or manual?

 

255/35-20 front and 275/35-20 rear and i've started from fourth.. it was really bogged down but I did it.

 

and burned some clutch I might add.

 

4.10's for sure.

 

Yep. I'm a butt hair or two under 3k at 80mph.

 

Send me a PM with your email addy and I'll send you an excel spreadsheet for speed vs RPM where you can input your tire size, gears, etc.

 

Yeah based on the spreadsheet Nuke sent me years ago, you likely have 4.10's. The give away is leaving in 4th. I've not tried that yet