http://fastlanemotorsports.us/ford-performance-4-09-gear-set-79-mustang/
Thoughts?
Sent from my SM-G935P using Tapatalk
Thoughts?
Sent from my SM-G935P using Tapatalk
4.09 gear
- Thread starter ChiSVT
- Start date
Would definitely get the car out of the hole faster and the engines have enough RPMs and a wide enough power band that it shouldn't be overkill. I'd be interested in a driving report and how they fair on the track with the different ratios. Would also love to drive a 350 equipped with them before doing the swap myself
Top speeds in each gear would be as followed (shown both GT350 305/30/R19 and GT350R 315/30/R19 tire sizes, rounded by first whole MPH below 8250rpm)
Stock 3.73: 4.09
(3.25) 1st: 55/53R 1st: 50/48R
(2.23) 2nd: 80/77R 2nd: 73/71R
(1.61) 3rd: 112/107R 3rd: 102/98R
(1.24) 4th: 145/140R 4th: 132/127R
(1.00) 5th: 180/173R 5th: 164/158R
Since 6th is just mathematical speed #s, the cruise RPM @ ~2000rpm would be (rounded to first whole MPH at 2000-2030rpm range)
(0.63) 6th: 70/68R 6th: 64/61R
Top speeds in each gear would be as followed (shown both GT350 305/30/R19 and GT350R 315/30/R19 tire sizes, rounded by first whole MPH below 8250rpm)
Stock 3.73: 4.09
(3.25) 1st: 55/53R 1st: 50/48R
(2.23) 2nd: 80/77R 2nd: 73/71R
(1.61) 3rd: 112/107R 3rd: 102/98R
(1.24) 4th: 145/140R 4th: 132/127R
(1.00) 5th: 180/173R 5th: 164/158R
Since 6th is just mathematical speed #s, the cruise RPM @ ~2000rpm would be (rounded to first whole MPH at 2000-2030rpm range)
(0.63) 6th: 70/68R 6th: 64/61R
Last edited:
I think it needs more like 4.30's or 4.50's
We will setup a paypal donation fund for you to be the guinea pig, haha. Thanks for posting the mph breakdowns! I think stock is 3.73 though.
I think it would be night and day in 1st gear.
Sent from my SM-G935P using Tapatalk
Last edited:
Yep, I remember swapping to 4.30s in my bolt-on '01 Cobra and it still felt like 4.56 would work.
Now if doing dedicated road course work, I'm not sure, but for street/strip I'm sure the gear would compliment this car very much.
Somebody heard of a GT350 gear swap yet?
-J
I typed 3.55 for some reason, but the #s inputted are 3.73s! My bad
I fully agree
Im dying to see this. What does the 350 top out at 175 or 180? As long as 5th can reach 155 minimum i can fux wit it.
Since our 1:1 gear is 5th its 180 in a stock model in 5th by RPM. 145 in 4th
Nice
Those gears won't work with the Super 8.8 rear in the S550.
gears are rather tall in the 350. it can definitely stand to gain a decent amount of acceleration with a shorter rear gear.
I think this car NEEDS 4.30 gears. I'm sure CAFE rules were the only reason it didn't come with them from the factory.
This car makes more torque than a coyote both stock and with bolt ons, but no one seems to think the 5.0 needs a 4.30 is what i'm getting at.
GT350 vs 5.0 - % longer for GT350 gear
1st: 3.252 / 3.66 - ~12% longer
2nd: 2.233 / 2.43 - ~9%
3rd: 1.611 / 1.69 - ~5% longer
4th: 1.243 / 1.32 - ~6% longer
The 5.0 stock (i'll use the 2015) makes 400 ft/lbs and the GT350 makes 430. So the GT350 makes about 7% more torque, which in anything other than 1st and 2nd is plenty when comparing the gears to the 5.0. I think for anything other than drag racing this car is set up quite well. This also isnt taking into account the 3.31 rear gear vs the 3.73.
GT350 vs 5.0 - % longer for GT350 gear
1st: 3.252 / 3.66 - ~12% longer
2nd: 2.233 / 2.43 - ~9%
3rd: 1.611 / 1.69 - ~5% longer
4th: 1.243 / 1.32 - ~6% longer
The 5.0 stock (i'll use the 2015) makes 400 ft/lbs and the GT350 makes 430. So the GT350 makes about 7% more torque, which in anything other than 1st and 2nd is plenty when comparing the gears to the 5.0. I think for anything other than drag racing this car is set up quite well. This also isnt taking into account the 3.31 rear gear vs the 3.73.
Last edited:
The Voodoo makes more torque at peak but, the GT350 could use a little boost getting out of the hole into the torque band. Using 4.09s (if they were to fit) you might be using 3-4-5 more than 2-3-4 on an open course, but for a street only car the 4.09 would be nice
Coyote (2015)
Voodoo
Seeing the dynos like that i guess i can see your point. Like i said, it still doesnt take the final drive into account (between 3.31 5.0 and 3.73 350), but going from a 3.73 to a 4.10 is still a 10% increase, which is pretty huge.
I guess personally i just dont see the "need" for a 4.10, but only going up 4-6% to like a 3.90 or so is hardly worth the upgrade... maybe the factory gear should have been just a tad shorter.
I guess personally i just dont see the "need" for a 4.10, but only going up 4-6% to like a 3.90 or so is hardly worth the upgrade... maybe the factory gear should have been just a tad shorter.
I think the factory final would have been enough if 1st gear wasn't so long.
I see why Ford did it, this car sticks the way it's geared and how it distributes power / torque. The problem is it feels lackluster at times around town at lower speeds. Also, if you like the dragstrip it is not a good setup. In a z06 or viper 1st to 60 is great, but with a high revving n/a dohc in a 3800+ lb car not so much.
Sent from my SM-G935P using Tapatalk
Last edited:
Users who are viewing this thread
