If you use the f-body calipers do you also use the rotor? Front and back!?!?!? What would the smallest tire/wheel combo you could use?
Just asking so I can put these notes in my little book. I couldnt find much on this in the how-to section.

Yes. The F-body calipers are designed for a 12" rotor vs your 11" rotor.

The F-body upgrade is only for the front.

16" rims are the smallest that will fit.

ok. why not the rear? are the calipers the same size? and just to clarify, I can use my stock wheels with this upgrade?


yea yea yea I know. shut up right.

saber are you still at home?

The honey comb 16' will NOT fit

I have the torque stars.

<<<< blue car

If you really want to do the rears, I guess you can. Most of your braking is done up front and the few who did the rears didn't notice a difference.

Being unfamiliar with GPs, I didn't know that. All Imp wheels fit.

Many wheels will work, only stock wheels we know will not clear are these:


But these cross lace wheels will:

16x8 in size. These make awesome drag rims.

~F~

First off the torque stars will fit cuz thats what i was running for a while and second of all if u want to do a rear brake upgrade there are 2 options a GXP swap or the bear big brake upgrade. Both over priced new for what they do but if you can find a GXP rear setup at a junkyard for under 300 id def do it. Stopping improves some, not a bunch but i still noticed a difference,and it looks amazing with 12" rotors all around.

Did you use a Grand Prix GXP or a Bonneville GXP? Anything I have looked at for the Grand Prix GXP shows 11" rotors, which is the same as stock. The Bonneville GXP has 12" rotors, though. So is it a direct swap? Do you have to replace the brackets?

Well grand prix GXP have 11.7" rotors while stock are 10.9. Its the same kit that the w-body store sells. the rear GXP caliper clears the rim by about 2 mm maybe 3.

In the rear? What year?

In 2005 is when the GP GXP came out and it ran until 2008. so between 2005 and 2008 and yes that is the rear setup. A lot of times I've noticed on junk yards they've listed the part as a GXP but I've called and they listed it wrong. It jus takes some time an research to try to find a set from a junkyard and you might have to buy the front and rear all together. The fronts are a 12.7" rotor and require a 17" rim to run them but it still should be cheaper to buy the front and back then sell the fronts if you don't run 17"s year round. Thats actually what I did.

Huh, RockAuto and everywhere else I have looked shows a 10.6" rear rotor for the GXP's.

Thats because rock auto and every other parts warehouse stocks the wrong part. Theres actually a post about that on clubgp lol. You just have to trust me on this one. Don't go to an auto parts warehouse off the internet unless its GMPartsDirect or the W-body store for this setup. Or of course look on car-parts.com and call the junk yard before you order the part.

Also another easy way to tell if its actually a GXP rotor and caliper is all stock rotors for that car are drilled and the calipers are made by PBR.

so what is needed to convert to the F-body fronts? other than the rotors and calipers?

might pull the brakes off the bird since it is not moving

Are there any improvements or is it otherwise worth it to upgrade the rears on a GTP with the GXP set up? What are the differences between the two set ups? I take it by your comment that the rear GXP brakes can be run on the GTP without having to go to larger wheels?

Sorry i havn't been keeping u on this school works been killing me but for the fbody question here's the answer
McMaster-Carr
Part# 6679K16 Desc: Metric Steel-Backed PTFE-Coated Brnz Bearing for 12 mm Shaft Diameter, 15 mm Length Price: $2.45/each Qty: 4

and that's it. heres an instal write up.
ClubGP Message Forum troubleshooting

MAKE SURE ITS FROM A 98-02 F-BODY

There are improvements. rear gxp can be run with the torque stars, crosslance is a no, Im actually running the torque stars and it u want a pic of the clearance i can do that let me know. The price of 600 at the wbody store in my opinion is not worth the it for the improvement you get but if u can find it for like 300 it is. also front GXP rotor is a 12.7 inch and will not fit stock rims. it requires a 17" one. hope this helps