Help with “final” performance mods...

[arichmond1003]

Alright guys, I’m coming to the community and to the experts for some mods to finish the car for the foreseeable future. As my car sits right now, it’s a FBO a10 car on e85. All the BMR bells and whistles for rear end components paired with Viking crusaders, one piece carbon fiber DS. I’m staying NA but I want the most out of the car, so the next and “final” performance mods are going to be a converter and rear end gears. I’m torn between 3.73 and 4.11 gears, I see a lot of people run 3.73 with the 10 speed on NA setups. Once I decide on my rear end ratio I will then get a converter off that
what do you guys say?

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[AZ18yote]

Alright guys, I’m coming to the community and to the experts for some mods to finish the car for the foreseeable future. As my car sits right now, it’s a FBO a10 car on e85. All the BMR bells and whistles for rear end components paired with Viking crusaders, one piece carbon fiber DS. I’m staying NA but I want the most out of the car, so the next and “final” performance mods are going to be a converter and rear end gears. I’m torn between 3.73 and 4.11 gears, I see a lot of people run 3.73 with the 10 speed on NA setups. Once I decide on my rear end ratio I will then get a converter off that
what do you guys say?

The ratio change is far less effective on the A10 vs the manual due to the gearing.

 

[WildHorse]

3.73 with the A10 is way to much IMO.

 

[arichmond1003]

3.73 with the A10 is way to much IMO.

But is it though? This isn’t a daily car btw. Gonna have little to zero highway driving and a high stall converter

 

[cahouston]

But is it though? This isn’t a daily car btw. Gonna have little to zero highway driving and a high stall converter

As it sits, in what gear and RPM do you cross the traps in the 1/4 mile? What size rear tires do you run?

 

[Stephen@lethal]

I think you would be fine going to a 3.73 if you are for sure staying bolt on. We sell a great converter for NA 10r80s as well. Hit me up if you have any questions about the setup. Lethalperformance.com

 

[Coyote Chase]

Depends on which transmission gear and what RPM you'er launching from...
NMRAdigtal interviewed 3 time champion, Marvin Knack at the end of last season. He gives some good insight on gearing and tire size!!

 

[TGYNYY]

But is it though? This isn’t a daily car btw. Gonna have little to zero highway driving and a high stall converter

I installed 3.73s a couple months ago on my 2019 GT PP1 A10, and I am so mad at myself for not going with the 4.11s. 3.73s weren’t enough. Go 4.11 all day.

 

[I Bleed Ford Blue]

Getting the heads ported is way beyond the FBO he is going for.

 

[Coyote Chase]

The ratio change is far less effective on the A10 vs the manual due to the gearing.

I'm thinking the same here...!? From what I understand, 1st gear is "almost" an underdrive....!!?

 

[arichmond1003]

W ended up going in the middle, I went 3.91. Kinda wish I just went 4.11 but still very happy with the results. Part of the reason I went 3.90 is I’m not sure of a lot of people using that rear gear ratio and I wanted to try

 

[Coyote Chase]

W ended up going in the middle, I went 3.91. Kinda wish I just went 4.11 but still very happy with the results. Part of the reason I went 3.90 is I’m not sure of a lot of people using that rear gear ratio and I wanted to try

From what I remember reading that's about what Marvin Knach runs. I think it said he has a 3:89 gear in a 9" Ford housing.
PS: As far as I know he still uses a modified 6 speed automatic transmission.

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