I plan on doing a gears in the rear 3.73's (i got 2.73's) and LT headers and a ORY .... will i need a tune after this ... yes ... but will it hurt my car if i dont get one right away? and if so what will be damaged?


car is basically stock 95 firebird formula

 

No it wont hurt. Your speedo will be off becuase of the gears and you might throw a code if you delete the emissions.

 

+++++1

 

any idea how far off the speedo will be?

 

Probably about 10 mph or so

 

If your car is an automatic it wont shift the way it should. You need to get the shift points changed.

 

how do i do that?

 

through a tune

 

oh boy that sounds like fun

 

Just send in your pcm to one of the mail order guys. PCM for less, madz28 etc or find a local performance shop

 

Going from 2.73s to 3.73s will set your speedo off WAY more than 10mph. You will certainly have shifting issues and a tune is absolutely necessary.

 

what do you mean shifting issues? please explain your the 2nd person to say that but what do you mean?

 

the car is gonna be bouncing off the limiter trying to shift

 

because with the shorter gears your car is gonna need to shift at a lower mph. With the 2.73's i bet your first gear goes to like 40mph at full throttle. With the 3.73's it will probably need to shift at a early 30mph. my 3.23's only go to 34mph at 6000rpm. Same with the other gears(2,3 and 4th) along with part throttle shifts like driving normal on the street. With the electronic controlled transmission its 100% necessary to change the shift point tables in the pcm.


a mail order tune isnt that much $$ anyways. It really isnt a big deal at all.

 

I've seen nothing but good things about Ion/Madz28...I'm definately going with him when I do my tune.

For a gear jump that big, yes it will be necessary.