run em down

iTrader: (1)

my car has a stock 10 bolt with 2.73's in it and is a daily driver. i want to get some better track times. if i put in a 3.42 rear with drag radials just for the track will this mess with anything computer wise?

i can easily switch between rears just for the track cause i need the car to dd, just wanna know if runnin it with higher gears w/o re-calibrating the speedo will make the car run bad? thanks.

shtnfrds

iTrader: (1)

shift points will most likely be off, might bang the limiter a few times.

sasquatch

iTrader: (2)

Going from 2.73's to 3.42's I had no computer problems only speedo was off about 10 mph.

alamantia

iTrader: (10)

if you are just changing the gears make sure you get 3.42's for a 2 series carrier.

run em down

iTrader: (1)

ill be changing the whole rearend, a friend has a spare. ill be running drag radials so im planning on switching the whole rearend for the track only. then changing it back to the 2.73 rearend for daily driving.

spaz1

iTrader: (9)

The shift ponits will be out to lunch, It probably won't full throttle shift without resetting the shift tables. And won't last long with drag radials.How are you running 12's with bolt on's and 2.73 gears? Cause my car is super slow then.

twitchtwice

iTrader: (12)

damn good luck man. thats an awful lot of work to go through

Greg Pippin

iTrader: (3)

I went from 2.73 to 4.11, and never had a problem with shift points or bouncing off the rev limiter. I also went from 4.11 to 3.42 and no problems eather. And i have not had the computer tuned.
It will be fine to change the gear, the spedo will just be off a little...

run em down

iTrader: (1)

i dont need it to last long just want it for the track haha. i have full boltons and a dyno tune, the tranny has shift points changed and line pressure bumped up as well. and i lived in florida at the time.

haha. only takes like 25-30 mins to pull a rear out of these cars. not that many bolts.

alamantia

iTrader: (10)

make sure that both rears have the same ABS set up and remember the speedo will be off

Elliott's94Z

iTrader: (12)

Shouldn't have any computer issues...like mentioned your speedo will be off. IMO if you don't do a lot of hwy/frwy driving and it's mainly a track car,, I would bump it up and do 3.73's

run em down

iTrader: (1)

i do all highway driving tho. plannin on gettin a 12 bolt in the near future, just figured since i have an extra rear might as well have some fun with it.

Elliott's94Z

iTrader: (12)

Got ya. In that case the 3.42 would be a better choice for your application.

Lethal Z

Going from a 2.73 rear end to a 3.23 rear end I was hitting the rev limiter, so its all in the tune. With regards to the rear end swap. I guarantee you will be rethinking that swapping rear ends back and forth. That is a lot of work, I've done it a couple of times and really don't care to do it again.

Tommyv8

iTrader: (8)

12.68 here, mods in my sig. Went 12.72 @ 108 on the stock converter and suspension (and a mineshaft DA). You just need to run in good weather.

spaz1

iTrader: (9)

my car sucks. It ran a 14.2 stock and 13.3 at 112 with the sts 8 psi. set up. We are up at around 5000 feet da. usualy.

Tommyv8

iTrader: (8)

Oh, well it's the DA that's killing you. I sometimes run in sea level conditions; the 12.68 in my sig was in a -6 DA.

Firefighterformula

HE SPEAKS THE TRUTH. I just finished swapping in a 3.42 rear for my 2.73. VERY happy with the results. BUT...I don't know if my unibody has flexed or what, but it was a BITCH to get the rear suspension reinstalled.

Not going to be doing that again any time soon. My back still hurts.

run em down

iTrader: (1)

ya i hear ya man. ive done a few rearends for buddies and whatnot. i dont mind the work. kinda like it actually. what kind of tuning did u do for the new gears if any?

Firefighterformula

None yet. I plan on it though, the GPS is my speedometer for now. I would definitely like to have the shift points redone, at least so it'll hold 1st for a bit longer. Don't know much about these things. As soon as I find a good tuner somewhere pretty close to Central VA, its off to the races.

You'll be happy with the results though. 2.73's blow.