Madlock Posted July 23, 2011 Report Share Posted July 23, 2011 As I work through the various combinations of wheel and tire options I now have, which will include sets for track, touring, and daily driving using the OE SVTPP wheels and tires and alternate sets of 18" and 19" suited for the purpose, I'm considering at least one option for 285/35-19's (or wider) in the rear which would be equivalent to the standard non-SVTPP rear tire diameter - which will also win-back some of the extra oomph a 3.73 would otherwise normally give. Since the front wheels stay within millimeters using 255/40-19 or 265/40-19 wheels up-front, reducing the rear tire diameter so dramatically (by nearly an inch) would appreciably alter the car's rake if I were to think solely about the rear wheel - and ignore how it might affect the rest of the car, because the spring height and length differ from the baseline GT500 and the SVTPP - meaning it makes the most sense to consider individual spring sets as much a part of the wheel options as the rear tire diameter. I've been looking through the Ford Parts web site, trying to distill down the various OE spring options - but their descriptions are rather useless in terms of determining, for example, which spring is intended for the Coupe, Convertible, or SVTPP version of each. Although I happen to have the Adjustable Dampers, believe me, Coilovers (if a decent dual-adjustable set existed) are sounding better every day - but that's another matter. I'm hoping somebody will be able to help me decode which spring part corresponds to which model/trim of GT500. Do the colors have any significance beyond the decorative? Rear Spring Part Numbers include: BR3V-5560-J BR3V-5560-L BR3V-5560-M The front springs include the following: AR33-5310-A - Shelby; Less Premium Brakes; Coil; Light Blue; SAF AR33-5310-B - Shelby; Less Premium Brakes; Coil; Blue; SBF AR33-5310-C - Shelby; Less Premium Brakes; Coil; White; SCF AR33-5310-F - Shelby; Less Premium Brakes; Coil; Yellow; SFF AR33-5310-G - Shelby; Less Premium Brakes; Coil; Orange; SFF BR33-5310-D - Shelby; Less Premium Brakes; Coil CR33-5310-T - Shelby; Coil CR33-5310-V - Shelby; Coil BR3Z-5310-E Shelby; Coupe, With Performance Brakes BR3Z-5310-F Shelby; Convertible, With Performance Brakes, Yellow, SFF BR3Z-5310-J Shelby Cobra GT 500; Convertible, With SVT Performance Pack BR3Z-5310-J Shelby Cobra GT 500; Coupe, Less SVT Performance Pack BR3Z-5310-K Shelby Cobra GT 500; Convertible, Less SVT Performance Pack BR3Z-5310-L Shelby Cobra GT 500; Coupe, With SVT Performance Pack It seems the last 4 are what's relevant to everybody owns. I just have do idea what the hell the "With/Without Performance Brakes" parts mean, and whether I may be better opting for the springs from an FR-3 handling pack on all 4 corners instead (M-5300-L)? My only concern is that the SVTPP has lowering springs that take into account the taller rear tire. Will going to a uniform 1.25" lowering in combination with the OE SVTPP rear tire negatively affect handling? Finally, for those who've found themselves having to trim their bump stops to accommodate wider wheels and tires, would the Ford Racing set of Jounce Bumpers from the FR-3 Pack be a workable alternative to cutting? I'd appreciate any help or guidance available. Link to comment Share on other sites More sharing options...
PapaZ Posted July 23, 2011 Report Share Posted July 23, 2011 Sorry I'm not too much help with the overall different spring height/rate for those part numbers. I tried myself to locate this info myself for my setup to no avail. I ended up buying new springs and trying different setups until I achieved the ride/stance/clearance compromise I was looking for. Adjustable coil overs are ultimately the way to go to dial it in ideally and there are several good options. As far as the bumpstop bracket goes, trimming it is a function of tire clearance within the wheel well laterally for those of us running the 335's. The ford racing lowered jounces are recommend to give more clearance between the bumpstop itself and the bumpstop bracket. This is necessary with lowering springs because without the shorter jounces/bumpstops the car will essentially ride on the factory taller bumpstops not allowing the spring any room to work up and down. The trimming of the bracket itself is done by trimming the outside lateral edge of the bracket leaving the bumpstop bracet still in place, not altering its position up or down, but allowing the wheel/tire to clear in the lateral direction. Basically so the hub of wheel can sit flush against the axle hub. It has nothing to do with the overall travel of the spring/suspension. Hope that helps and pm me if you need more info! M Link to comment Share on other sites More sharing options...
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