question about changing rear wheel size

[FlyLike]

I'm just going to bullet point this for simplicity:

-1998 camaro w/ abs
-Just bought 15" prostars for front and back w/ MT tires
-going to be running a 27" tall tire out back
-going to be running a smaller front runner as well

when I put that 27" tire on in the back and the small stuff up front, will it cause issues with the ABS / traction control, and should I bother changing the speedo gear?

I plan to do a 3.73 or 4.10 rear end gear soon as well, which I know I'll have to do a speedo gear for.

Thanks for any help.

 

[Birdie2000]

Don't know if it'll mess with the ABS on an LS1 car, but on my LT1 car with a 12-bolt and ABS the 28" rears and 26" fronts were never a problem. Don't know if it will mess with traction control, but honestly I would just disable that anyway. You don't need to change the speedo gear, it's all electronic and changed with a computer tune. Do you plan to run 27" tires in the rear all the time? If not, program the computer for whatever gears and tire diameter you'll run on the street. Having an accurate speedo is important on the street and not important at the track.

 

[1BADAIR]

for it to shift correctly the pcm info has to be changed

 

[FlyLike]

for it to shift correctly the pcm info has to be changed

ah, I didn't know that. I need to find myself a general F-Body mechanic or shop I can call and ask for help and do all the work for me....

Don't know if it'll mess with the ABS on an LS1 car, but on my LT1 car with a 12-bolt and ABS the 28" rears and 26" fronts were never a problem. Don't know if it will mess with traction control, but honestly I would just disable that anyway. You don't need to change the speedo gear, it's all electronic and changed with a computer tune. Do you plan to run 27" tires in the rear all the time? If not, program the computer for whatever gears and tire diameter you'll run on the street. Having an accurate speedo is important on the street and not important at the track.

Thanks for the info.

 

[Birdie2000]

Ah, yeah, mine was a T56 and then I converted to a reverse manual TH400 so I never had to deal with that.

 

[1BADAIR]

i have used 26's 27's and 28's with 26's on the front without any abs issues.

 

[FlyLike]

okay, so it seems like getting the trans tuned is what's important then.