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3.8 Final Drive for manual

5K views 28 replies 5 participants last post by  shorttrack 
#1 ·
Hello,

I have a 14 Gen Coupe 3.8 RSpec. I'm looking to swap my final drive to a 4.18. there might be a forum i missed, but i looked around and haven't seen someone talk about there actual personal experience with it. I was considering a 3.909 as well so if you did that please say how you like it and why you chose it. To be honest my goal currently with the car is to make it beat a 5.0 while staying NA and not completely gutting out my interior. not sure if that's possible but i guess we will see.
 
#4 ·
I thought the BK1 auto 2.0 had the highest ratio

this is what I found.

bk1 auto 2.0
4.81:1 (which seems wrong to me. Might have been a typo, but I found the same number on more than one site)

bk2 auto 2.0
4.18:1

I have a bk1 auto 2.0. I'll check after work.
 
#5 ·
I have a 2014 R-Spec with 3:909.1 with many mods ,running sticky when hot 285 35 19 Potenza RE71 r tires (with nitrous oxide) .Am switching to 305 35 18 ( need more traction on the streets),I flared my rear fender arches with a fender roller tool .Will be going to 4:18.1 Gears for more acceleration out the hole on motor and on N2O .If running small 275 35 19's ,go with the 3:909.1 gear set .
 
#9 ·
I have a 2014(with nitrous oxide) .Am switching to 305 35 18 ( need more traction on the streets),I flared my rear fender arches with a fender roller tool .Will be going to 4:18.1 Gears for more acceleration out the hole on motor and on N2O .If running small 275 35 19's ,go with the 3:909.1 gear set .
I have the hankook ventus v12 evo2 tires with 275/30/19 in the rear. they stick well with the stock power, but i dont know how good they will be with more torque. how many shots of N2O do you run?
 
#19 ·
I might add while active on the streets I beat some pretty fast OEM offerings such as a 2015 Z28 camaro, 2016/17 shelby 350 . I sprayed them ,but still it is my $38,000 home built Gen Coupe again'st a $60,000 plus Mustang and a $70,000 plus camaro . Cars are getting faster so I must change up a bit .I can only get my 60 foot down .Can't throw anymore Nitrous to the car as I don't want to F-up my engine-YET .
 
#21 ·
Buying a vertical Mill and a lathe that comes with a 3&4 chuck and tig and mig welder for my garage so I can fab my on parts (wife is pissed,oh well).With all of these machining items I will get the traction sorted out very well and any other fabbed items I need I can now make myself at home .
 
#22 · (Edited)
There is a automatic level 10 tranny /turbo 3.8 V6 running 11.17@ 126 mph in 1/4 now .Go to Dragtimes.com web Site ,nice car.
 
#29 ·
I am using 2 baffled catch cans inline on the PCV side and a stainless steel vent filter on the non PCV side. .
 
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