just want to know if any of you guys has this set up
i have the 3.9 fd in my AT Z..........dont know how it would do with the SC set up

hope any of you can chime in with this
thanks
paul

 

I do, I think it's great

 

Could be helpful, but it might be a little excessive if you plan on upping the boost. I am running the 2.87 pulley and traction isnt that great.

 

I have this set up also and find that the gears give me a good dig down low until the SC really starts to kick in. Traction can be an issue at times but wider sticker tires should help.

I'm a stick shift though.

 

I believe a 3.9 in a AT5 tranny will be more like running a 4.1 or something close . A 3.7 will be equal to a 3.9 in a AT5 tranny .

Something that they havent mentioned...on a MT6 tranny and a 3.9 rear...they basicly dont use 1st gear any more and Im sure second is very short too.

 

since your auto...it would prob help u in 1/4 mile situations but upgrade the valvebody too....but dont be pissed ifin a year or so your tranny doesnt like it....thats hit or miss....
sentry your not auto?!

 

yeah I'm not auto, I'm 6 speed
sorry about that

3.9 in an auto will be pretty extreme
might work out just fine if you're not going for much power though or get some serious tires

 

i cant really imagine shorter than 3.5 gears. 1st and 2nd seem really short as it is.

 

im not planning more power with the vortech...just a conservative tune.around
330-350ish...
havnt heard any guys with 3.9fd AT....looks like im the first one!

 

there's guys that have gone 3.9 with 5AT - just maybe not with a vortech.

If you're shooting for power that low, then you can probably get away with a 3.9

 

I had the 3.5 with my AT5 and it just was to much for me . 1st and 2nd spun all the time . I went back to a 3.3 . With a stock Vortech kit it may have been alright

 

You're not the first with the 3.917 on the 5AT.

 

hahahahaha.i know........
any inputs on yours?

 

im just planning for a stock vortech kit

am i just fine with that?
thanks

 

Dude, I'm thinking about to swap to a 3.917 rear myself, but hesitating about the overall drivabilty. How far from NY are you? If you show me yours, I'll show you mine (a bad-*** G37 paddle-shift retrofit in a 03 Z done by turbocad6)

 

i have the 3.9 on a 05 6mt na... i love it!! it keeps the car in the power band! i am currently doing a mild build w/ a vortec. cant wait to finish!!