Torque converter w/already upgraded gears - Ford Mustang Forum
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post #1 of 7 (permalink) Old 07-22-2016 Thread Starter
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Torque converter w/already upgraded gears

Hi, so in my noobness, I went 3.73's in my '13 auto GT. Realizing I prolly should have gone the torque converter route with stock gears, should I replace the 3.73's with stock or go with a different ratio, like 3.55's? Or will I just lose any additional benefit with 3.73's other than maybe some top end?

I still have the oem gears...

On a slightly related note, while I have the tranny dropped, should I be considering other upgrades? I think a hardened output (or is that input?) shaft is a must...

Thanks.

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post #2 of 7 (permalink) Old 07-22-2016
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Originally Posted by dondino View Post
Hi, so in my noobness, I went 3.73's in my '13 auto GT. Realizing I prolly should have gone the torque converter route with stock gears, should I replace the 3.73's with stock or go with a different ratio, like 3.55's? Or will I just lose any additional benefit with 3.73's other than maybe some top end?

I still have the oem gears...

On a slightly related note, while I have the tranny dropped, should I be considering other upgrades? I think a hardened output (or is that input?) shaft is a must...

Thanks.
There is such a minor difference between 3.55 and 3.73, it would be a waste of time and money to play with your gears any more until you are at a point that you are min/maxing your setup.

Why are you considering changing back to stock?


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post #3 of 7 (permalink) Old 07-23-2016
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If you're about the track, what gear/rpm do you trap at. That might tell you if you need to drop back to a 3.15 or 3.31. If you don't care about the track, keep the 3.73's and slap the tc in.
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post #4 of 7 (permalink) Old 07-23-2016 Thread Starter
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Why are you considering changing back to stock?
Only because if the 3.73's worked against the TC, I'd swap. But if there's no performance hit keeping them in, I'll just keep them in.
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post #5 of 7 (permalink) Old 07-23-2016 Thread Starter
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If you're about the track, what gear/rpm do you trap at. That might tell you if you need to drop back to a 3.15 or 3.31. If you don't care about the track, keep the 3.73's and slap the tc in.
Yeah, not too concerned with the track. Of course that could change next week...

I'm mostly concerned with launches from red lights so Camaro's can suck on my exhaust fumes.
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post #6 of 7 (permalink) Old 07-23-2016
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You will likely have issues hooking up if you go 3.73 with a Torque Converter. There have been several threads on here about how the autos really don't need a gear swap because anything more than 3.55 will make first gear unusable. The auto has a really steep 1st gear and with the stock rear gears it is comparable to a manual with 3.55. I would put the stock gears back in or go 3.31, as that is supposed to be the best rear gears for the 1/4 mile.

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post #7 of 7 (permalink) Old 07-23-2016
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While I totally agree that there is no need for steeper gears with a TC equipped auto and you'll probably boil tires as hard as a Hellcat with them both in there, they are already installed so, see if you like how it feels, then swap if needed. Stock the 3.15 and the 4:17 first in the auto make for about the same overall gearing as my old 3.73 MT82 car. First was FAR more useless on that car, bc of how tricky launching a steep geared stick car on the street can be. The auto will walk it 8 times out of ten because traction is limited, the torque converter is super tight, it's got torque multiplication from the TC and it's point and shoot.
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