Ok I know the jounch bumper part number is 10164173. But isn't this standard number and doesn't the SS and WS6 cars have a different part number or is the only difference an added spacer for the 17s.

I just put 17s z06 9.5 inch 54 mm on my 96z. I seem to be getting noise. I was going to buy SS or WS6 jounce bumpers and the spacers from slp.

But thought read the jounce bumpers are different on the SS and WS6.
I may have to take wheel off my 99 ws6 and take a look. I have 17s on there of course with no problems.


But thought someone can clear this up with part numbers.

 

My parts manual suggest that '98-up SS's and WS6's use PN 10282449 jounce bumpers, and all other 4th-gen F-bodies use PN 10164173.

I know that SLP sells jounce bumper relocation parts.

Having installed 17x11's on my Camaro, I wouldn't have thought that 17x9.5's would rub on anything in the rear. I did discover that the inner-rim-mounted wheel weights on my 17x9.5 fronts rubbed on that round "bump" on the steering knuckles, though.

 

I found out same at parts counter today..the 17 inch wheel combo has 10282449 as jounce bumpers 16 inch has 10164173. Also gm had 10282451 as
spacers listed with the 17 inch combos. Slp has its 800046 or something like that for its spacers.

I looked at my 99 trans am ws6 and it has the spacers..the ws6 jounce bumpers and have no problems with firehawk slp eibachs and firehawk rims and kyb agx.I have non adjustable panhard on the 99 ta.

I think was hitting the jounce bumpers on the 96z last night but have hotchkis drop springs ,kyb agx and stock 96 jounce bumpers with no spacers
and z06 17 by 9.4 54mm rims.I have adjustable panhard on the 96z.
I think part of my problem was trying to run the kyb agx at 1 front and back since thinking was our roads suck big time and the ride would be better at expense of handling. I tried the back at 4 and the front at 3 and actually both ride and handling seem much improved. I think do to the lowering springs have to dail up the shocks a bit to control them.The ride and handling seems much much better and can still try a bit more in the front or back whatever. Some hate the kyb and they do seem pretty weak on lowering spring cars but they say not to use them with a big drop. My slp on the 99 ta drop maybe inch and same with the hotckhis on the 96z. I would try dialing them up to 4 all around or whatever and see how you like them.One advantage of adjustable shocks.

So not sure why I really need this ws6 or 99 jounce bumper and the spacer..
I don't seem to be hitting anything on the jounce bumper.So what does the proper 17 inch jounce bumper and spacer do exactly or is it mostly necessary with stock soft shocks at stock height?

 

What I found strange is that the parts manual is pretty clear that the different jounce bumpers are '98-up 17" cars... apparantly the '96 & '97 SS's and WS6's use the same bump stops as the standard 16" cars. Of course, it might have everything to do with offsets.

I'm not sure what the difference is between the different jounce bumper, or what exactly the SLP spacer is supposed to accomplish. I got my 17x11's free of bump stop interferance by using a grinder on the jounce bumpers and their brackets. Like I said before, I wouldn't think a 17x9.5 (assuming an appropriate offset) could contact the bumps stops, since the 17x11's just barely contact them.

 

I'm not trying to be a dumbass, but just what are jounce bumpers, and why are spacers necessary if you run 17" wheels? i have wondered this for a while. does anyone have a good pic to show me so i know what they are?

 

They're also commonly called bump stops, and are basically a block of rubber-type material mounted to the "frame". The purpose they serve is that they prevent damage to various suspension components if your car "bottoms out". In fact, if you go over a huge bump in the road, and you feel that "bottoming out", it's the axle bumping into these jounce bumpers and stopping.

Take off one of your rear wheels, and you'll see it front and center, above and behind the brake rotor, and in front of the shock/spring.

 

I still don't know why (according to the parts manual) the '96-'97 17" cars use the same jounce bumper (PN 10164173) as the 16" cars, but the '98-up 17" cars use a different one.

And that SLP spacer... does it just move the bump stop closer to the axle, allowing less suspension travel? That might make sense, since the 17" cars have stiffer springs and shocks.