You know how you can buy lowering springs for the rear suspension of a 91 firebird... but i dont want to lower the rear i want to higher it... does anyone know if they make highering springs for a v6 91 firebird and where i can get them??? Please Respond A.S.A.P.

 

Why don't you just get some air shocks if you want to raise the rear it's a far sight easier.

 

put in the new factory rear springs, keep your isolators in place. It'll raise it from where it sits now i'd bet.

Moog cc635, or 5665 (cc is the variable rate, 5665 is the straight rate.)
You can always toss a spacer above the top isolator too.

I think big tires help raise it the most My 275/60/R15's with the cc635's sit like a dragster

 

raise it that way your weight transfer sucks????

As stated, new factory replacement springs are an almost garrantied height increase. OE springs are a minimum of 15 years old at this point...they've settled.
I wouldn't do that because then nothing would be locating the spring. It could easily spit out.