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aleros_eat_rice · 07-27-2014, 03:32 AM

I was considering a brake upgrade, getting it piece by piece. I could get the parts for the F body conversion (front) from rockauto for around $250 or so. I could also get the F body front kit from MMS for like $300, which takes out all of the guessing. With rockauto, I could get parts individually, though, and not spend all of that at once.

As for the rears, just to be sure, the 05 GP GXP is the one with the 5.3 V8, correct? I'm not all that familiar with the GP. Edit: looked it up.

It seems the rotors are close as well, the parking brake shoe is the same p/n for the 99 GLS as the 05 GXP. However, the bolt pattern of the rotor is different. The GLS pattern is 5x4.65", but the GXP pattern is 5x4.53". Going metric, they are 118mm GLS, 114.98mm GXP. That being a difference of 3.02mm, which if you go by radius, is halved (I guess is what I'm trying to say). Meaning an overall difference of 1.51mm.

The question being, with this difference, are the rotors compatible or no?

07-27-2014, 03:32 AM	#44
aleros_eat_rice GL Member Join Date: Feb 2014 Location: Williamsburg Posts: 300	I was considering a brake upgrade, getting it piece by piece. I could get the parts for the F body conversion (front) from rockauto for around $250 or so. I could also get the F body front kit from MMS for like $300, which takes out all of the guessing. With rockauto, I could get parts individually, though, and not spend all of that at once. As for the rears, just to be sure, the 05 GP GXP is the one with the 5.3 V8, correct? I'm not all that familiar with the GP. Edit: looked it up. It seems the rotors are close as well, the parking brake shoe is the same p/n for the 99 GLS as the 05 GXP. However, the bolt pattern of the rotor is different. The GLS pattern is 5x4.65", but the GXP pattern is 5x4.53". Going metric, they are 118mm GLS, 114.98mm GXP. That being a difference of 3.02mm, which if you go by radius, is halved (I guess is what I'm trying to say). Meaning an overall difference of 1.51mm. The question being, with this difference, are the rotors compatible or no? __________________ 1999 Alero GLS, 3400, 4T45E, current mods: WAI with Spectre HPR cone filter, VVME 55w 8000k HID kit 275,000 miles as of 05-14-2015 at 1559 est (3:59 pm) Planned mods: F body front brake upgrade, ported UIM, LX9 top swap, ported exhaust mans, performance cam. Eventually, turbo or supercharger. 1999 Olds Bravada, 4300 Vortec v6, 4L60E. Current mods (on it when I bought it): 75mm ported throttle body, NGK stage 1 plugs, stage 1 heads. Planned mods: injector upgrade, exhaust headers Last edited by aleros_eat_rice : 07-27-2014 at 04:12 AM.