rear end gearing
08-15-2007, 08:53 PM
#2
Moderator
Join Date: Sep 2006
Location: Northernish Eastish Central Texas
Posts: 3,302
RE: rear end gearing
What are you trying to do? Good gas mileage or high performance? Ever gear set is a compromise between the 2. The best all around ratio however for the 5 speed is around the 3.40-3.55 range
08-15-2007, 09:45 PM
#4
3rd Gear Member
Join Date: Jul 2007
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Posts: 877
RE: rear end gearing
I agree with all those that said around the 3.50:1 range depending on desired application with one exception, which T5 are you running? The reason I ask is that 1st gear is different depending on the type of T5. I have a Z spec T5 and the first gear is 2.95 so I can run lower gears in the 3.50:1 to 4.11:1 rage with better results and a still usable first gear. The majority of the T5s in 5.0 cars were 3.35 so at that point you need to do as other suggested and stay close to 3.50:1
08-21-2007, 08:48 PM
#6
5th Gear Member
Join Date: Sep 2006
Location: Australia
Posts: 2,266
RE: rear end gearing
Daze, aren't there a number of different 5th gear ratios for T5's as well?
Just a thought...to make sure the car is not running in that 1900 -2100 rpm range in 5th at highway speed so as to avoid droning exhaust.
Just a thought...to make sure the car is not running in that 1900 -2100 rpm range in 5th at highway speed so as to avoid droning exhaust.
08-22-2007, 01:59 PM
#8
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Join Date: Sep 2005
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Posts: 1,494
RE: rear end gearing
My T5 has the 3.35 first gear, and the .68 OD. I think it matches quite nicely with my 3.73 rear end, though a 3.50 would have been ok. All that is behind a 408W making 400 hp, 500lbs of torque at the rear wheels. It really jumps up and runs, but its not too bad on the highway. I just drove it home to Texas from California.
08-22-2007, 02:21 PM
#9
5th Gear Member
Join Date: Nov 2006
Location: North Fulton, GA
Posts: 2,287
RE: rear end gearing
ORIGINAL: Aussie66Fastback
Daze, aren't there a number of different 5th gear ratios for T5's as well?
Just a thought...to make sure the car is not running in that 1900 -2100 rpm range in 5th at highway speed so as to avoid droning exhaust.
Daze, aren't there a number of different 5th gear ratios for T5's as well?
Just a thought...to make sure the car is not running in that 1900 -2100 rpm range in 5th at highway speed so as to avoid droning exhaust.
Here's a chart to look up your gears:
http://www.allfordmustangs.com/Detailed/349.shtml
08-22-2007, 02:31 PM
#10
I ♥ Acer
Join Date: Oct 2004
Location:
Posts: 17,565
RE: rear end gearing
ORIGINAL: superdavid
My T5 has the 3.35 first gear, and the .68 OD. I think it matches quite nicely with my 3.73 rear end, though a 3.50 would have been ok. All that is behind a 408W making 400 hp, 500lbs of torque at the rear wheels. It really jumps up and runs, but its not too bad on the highway. I just drove it home to Texas from California.
My T5 has the 3.35 first gear, and the .68 OD. I think it matches quite nicely with my 3.73 rear end, though a 3.50 would have been ok. All that is behind a 408W making 400 hp, 500lbs of torque at the rear wheels. It really jumps up and runs, but its not too bad on the highway. I just drove it home to Texas from California.
