Vintage Mustang Forums banner

1 - 20 of 28 Posts

·
Banned
Joined
·
1,583 Posts
using 24.97" tire diameter

65MPH
3.00: 2624 RPM's in 4th / 1784 in 5th (using .68)
2.25: 2843 / 1933
3.50: 3061 / 2082
3.70: 3236 / 2201
3.80: 3324 / 2260
 

·
Registered
Joined
·
20,884 Posts
Keep in mind your 1st gear is going to be effected in the opposite direction. IIRC all production WC T5's used a 3.35:1. I'm not talking about the Z spec or 83 to 84 which used a 2.95:1. With a 3.70 rear gear, 1st is going to be very short. You'll be shifting into 2nd pretty quickly. Personally, I think I would stay with either 3.25 or 3.40 for a good over all set up.
 

·
Registered
Joined
·
762 Posts
Yeah, I'm running a 9" rear geared 3.50:1 with a WC T5 and 215/60/15 tires.
 

·
Registered
Joined
·
3,973 Posts
Way back we ran a 3.73 with a T5 and a Tremec. Cannot remember the rpm but it was low in 5th. Drove from the Detroit area to Dallas a couple of times in a blown '93 Coupe (our race car now). Having gone through stock 2.73 gears to 3.08 to 3.55 to finally 3.73's (obviously in a 8.8 rear), as long as you run an OD tranny, don't be afraid of steeper gears.
 

·
Registered
Joined
·
805 Posts
1st is going to be very short...
I think it depends on what you are used to drive. 3.55 rear was an stock option on the 05'-and some models was even available with 3.73. That's with a 3.38 first gear. I recently had a short ride i a 07' Shelby with the 3.55 rear and it felt more like a cruiser than a race car.

To me a "short" 1st makes the car much easier/comfortable to drive. But it may do a difference that I'm a European. Around here 98% of the daily drivers are stick shift.
 

·
Registered
Joined
·
20,884 Posts
I think it depends on what you are used to drive. 3.55 rear was an stock option on the 05'-and some models was even available with 3.73. That's with a 3.38 first gear. I recently had a short ride i a 07' Shelby with the 3.55 rear and it felt more like a cruiser than a race car.

To me a "short" 1st makes the car much easier/comfortable to drive. But it may do a difference that I'm a European. Around here 98% of the daily drivers are stick shift.

That's been a complaint ever since Ford started selling the 8.8 over the counter with 3.73's with the 5.0 guys. On the 97 Shelby, what was the diameter of the tire? You're also talking about an over head cam engine that likes to rev vs a OHV SBF that doesn't. I had a 5.0 with 2.73 and my brother had one with 3.27. I thought the 3.27 was just about a perfect match in gearing with the 5.0. Americans are more use to driving larger engines that make great low end power. On my 85, 5.0 I could shift into 5th gear, 2.73x.068 at 750 rpm, idle, step on the gas and it would go nice and smooth. No bucking or anything. Not recommend it, I didn't do it but it could be done.
 

·
Registered
Joined
·
1,925 Posts
I just took my car out for a ride, at 60 i'm at 2,000 rpm. my setup is-

t5z with 2.95 first and an .63 od
3.80 gears
235-60-14 tires, aprox 25.1 in dia

I know it's a bit different than your setup but it should give you an idea
 

·
Registered
Joined
·
467 Posts
I just got my new pumpkin delivered today. I ordered 3.55's but he sent 3.80's accidentally. He offered to send the correct gears. But a buddy is telling me not to fear the gears!
 

·
Banned
Joined
·
1,583 Posts
I just got my new pumpkin delivered today. I ordered 3.55's but he sent 3.80's accidentally. He offered to send the correct gears. But a buddy is telling me not to fear the gears!
I'd have no regrets installing a 3.80 running a T5 and XE268H cam! It is really going to allow the revs that cam needs. The 3.55 would have been about as low of a gear ratio as I'd even consider with that cam.

:cheers:
 

·
Registered
Joined
·
467 Posts
I'd have no regrets installing a 3.80 running a T5 and XE268H cam! It is really going to allow the revs that cam needs. The 3.55 would have been about as low of a gear ratio as I'd even consider with that cam.

:cheers:
What gears does your t5 have?
 
1 - 20 of 28 Posts
Top