I have a 93 auto firebird with all of the bolt ons and 4:10s and running 13.0's. I am buying a 3400 stall converter, and I am not sure what to do about the rear. I have a rear from a 98 with low miles(mine has 160,000) on it with 2:73s that I was gonna put it, and maybe install 3;23's that I have laying around.
Heres my question, should I
1.Leave the 4:10s and 3400 stall (it is my daily driver)
2.Put the ls1 rear with 2:73s
3.Put the ls1 rear and change the carrier and install 3:23's
I am not sure what to do, any input will be appreciated.
Thanks,
Matt

 

If your fine with how the car cruises with 4.10's in it, keep em when you get the 3400 stall converter. But if you plan hooking up out of the hole, you'll need some sticky tires.

 

If you stay with the 4.10s and a 3400 stall and its your daily driver get your wallet out cause its gonna guzzle the gas.
If it were me I would go 3400 stall with the 4.10s and buy a beater.

 

A 3400 stall and 4.10 gears sounds like a lot of fun to me.

 

Thanks for the responses!!

 

2.73s and a big stall sound like the worst possible idea ever.
probobly feel like CRAP when you are driving.

3400rpm with a 2.73 rear is about 30-35mph. you are trying to get the tires to go from 0- 35 mph and hook instantly. Lots of luck. Lots of "snapping" from a stop if i had to guess depending on tires.

3400 rpms and a 4.10 is 0-20mph. MUCH better.

 

Listen to Trey. A numerically higher rear gear ratio actually makes a converter behave better, while also helping it perform better. I don't know the affects on gas mileage though. If you decide to to reduce the rear, I wouldn't go below a 3.73 with that high of a stall.
I think you should leave the rear in for now, and just put in the converter and see how you like it.

 

I should probobly point out that the same is true for a 6speed car with a big cam.

gears are a must-
why?

you need to launch at 4000rpms to get into your powerband, BUT your tires arne't just goign to go from 0-40 without putting ENORMOUS stress on the everything that spins!

going 0-20. not so bad.

or you can launch at 2500 rpms, hook and struggle into your powerband while bogging the motor because you dont make power down there anyway.

Thats why I got a 93 T-56 with 3.36 first gear ratio and 4.10s
cruise 75mph @ 2500- and 100mph at 3300 rpms
off the line? 3500rpms = 19mph
gives me some time to shift too! 38/61/94/127 mph shift points at 6800rpm red line. 3rd gear should be great for autocrossing too, 2nd will be nice for right courses.

 

Before reading the responses I was thinking about just leaving them in there. Now reading that alot of people think the same, I will just leave them in.
Thanks for the help
Matt