i was wondering if anyone could tell me what the biggest rim i can ride on. i want to do 22"s but im affraid of messing up the transmission. i dont wanna go any smaller than a 20" tho. i was thinkin of maybe 22x8.5 or 20x8.5. let me kno what ya'll think.

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8000k hid conversion, 5% tint, brushed alluminum dash kit. more to come...

anything bigger than the stockers is harder on your trans, but rims 8"-8.5" in width with a 42mm offset are the best bet So;

245/45 R18
245/40 R20
245/35? R22
Probably best tire sizes

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2002 GT...Wizardair, ZZP 2.5 o/r dp, Special Eddition two-tone leather interior added, HUD added, 12" Brake Upgrade, ZZP strut tower bars, gmpp sway bars,-6an braided SS fuel hoses , Hptuned, Top Swaped.....
I've got Boost!! I've got only 1.5* KR left my poor L36 block.....

don't do that it will look terrible. put 19's on. if you have to... go with the 20's

20s on the 04+ body style look supreme. just remember to lower the car so it actually tucks and looks nice. 4x4 grand prix's are the worst.

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98 XGT - 3.2/3.4, s&s, ported m90/TB/LIM, 1.9s, jp dbl; tinted, blacked out, lowered
soon -> e85, meth, and a lot smaller pulley

yea it will definately be lowered. probably gonna do 20's with a 2" drop.

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8000k hid conversion, 5% tint, brushed alluminum dash kit. more to come...

make sure you lower it correctly. you may need spacers for the motor/trans because of the offset geometry when you lower the car creating acceleration vibrations.

2" is a lot for these cars. intrax springs will do that for the most part, but the ride will be pretty harsh. coilovers are hella expensive.

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98 XGT - 3.2/3.4, s&s, ported m90/TB/LIM, 1.9s, jp dbl; tinted, blacked out, lowered
soon -> e85, meth, and a lot smaller pulley

Be sure to look into these when you do this: http://www.grandprixforums.net/f51/m...back-1107.html (Motor Mount Spacers are back!)

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so what happens if i dont get the spacers? ive never heard of that and ive lowered alot of cars. never had any probs. the only springs i can find 1.75" drop so i might end up with that but i really dont think thats gonna be enough. are the spacers a must have?

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8000k hid conversion, 5% tint, brushed alluminum dash kit. more to come...

without the spacers or shorter dogbones the car will more than likely have acceleration vibration. they arent very nice at all.

shorter dogbones are the easy way out. the plates that vinnie sells are the best way to go about it.

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98 XGT - 3.2/3.4, s&s, ported m90/TB/LIM, 1.9s, jp dbl; tinted, blacked out, lowered
soon -> e85, meth, and a lot smaller pulley

Anything heavier than stocker is harder on your trans. I like 8.5" with +35mm offset myself. 245/40-20 is too tall of a tire. It is an inch larger diameter than stock. 245/35-20 would be closest at that width for 20s and to maintain near stock diameter for 22s you'd need a 245/25-22 (Do they even make that size?). Way too little sidewall in either case for me.

Out of your two choices, I'd definately say 20s. I'd go 19s, but have seen some really nice 04+ GPs with 20s and a few 97-03s that looked nice as well. I can't speak from personal experience as all of mine have had 17s/18s.

Never hurts to be on the safe side with the lowering as well. I'd hit him up for some spacers.

Good luck with whatever you choose!! Tastefully done, it will look beautiful!!

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Jason Klingaman
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