I have an 89 Iroc and I put the 91-92 ground effects on it and they dont really seem to be the same length as my original ground effects. for example

the front lower peice that wraps around the nose and fenders does not quiet rech the wheel wells


the rocker ground effects do not line up on the car well and seem to be to short as well


Am I the only one who has this problem? And if so do I need to switch over to 91-92 fenders to solve the problem?

Thank you in advance for your help!

I have just done this swap on my 88 camaro last week. I had to drill all new holes for the rockers and rear 1/4 panel extensions. The front of the rockers line up with the front fender lip, but in the rear there is about a 1/2 inch gap between the end of the rocker and where it is supposed to meet with the rear fender lip. Rear bumper cover bolted up fine with no problems, and I don't have the front spoiler piece yet so I can't comment on that one.

I recently finished my conversion on my 87 and noticed a slight lenght and fitment issue but after all the work. and all yet to come i figure ill let my uncle (bodyman) mess with it. then if it still looks ok i dint think no one will notice with out looking really close.

illpost picsof what i mean when it gets light out. tommorrow

So im not the only one! Does anybody know if the fenders are to blame for this problem? What I am thinking is maybe they (82-90 fenders) have a slightly smaller wheel opening than 91-92s and that explains the fittment issues. Anybody got any other ideas?

I put them on my 89 and I didn't have any problems

I was in a parking lot yesterday and I saw a factory 91 RS so I swung by and took a look at the ground effects. It also has the same size gap from the rear of the rocker panel and the rear wheel opening so I don't think that the fenders are different.

My friend put the 91-92 GFX on his 86 and it lines up and looks perfect.

Nope, I had an '87 Z28 left fender on my '91 RS and the gfx fit perfectly after a few new holes were drilled.

I wonder what the hell is going on! Why do some peoples fit and others not


By the way the circled areas are the places to look for issues

Everybody that has these ground effects please tell me if yours has this problem or not.

I have a problem with the rear of the front tire hitting the gfx on both sides.

What front tire sizes are you guys running that don't have this problem. I currently have 255/50-16 and they rub bad.

Did anyone have problems with the door peices going on or did you have to drill new holes?? I tried to fit up a door peice and the bolt were in a different spot.

Yea same prob here with the different bolts.

I run 245-50-16 and mine dont rub.

Yea that door piece was a nightmare but since driver door is getting replaced it will have to do till i get my new door.

I ll get pics today for sure.

Mine went on pretty easy, most of the holes need to be redrilled and old ones filled, but it's all pretty self explainitory. If you are having fitment issues with the fender check if it's a GM fender, aftermarket fenders are crap and don't fit quite right. (let alone they are thinner and will dent easier)

Also, I am running 285/40/17's in the front and rear and the front rubs a little bit when the wheels are turned hard over. I did a little bit of clearancing on the front GFX and side pieces to aleviate the issue.

My '91 nose and gfx on my '84 Z28.

Put the 91 gfx on the 83 in my sig, had no problems at all. Everything fits ok. Running 275/40/17's with no rubbing at all...

Where do you guys get these gfx no junk yards around here have them. Was thinking about buying them used from hawks is that a good idea?

I have been really busy lately due to change in job location(same co.). Had to borrow a truck to move SnapOn box anyway.
Here is my fitment issues some are bad but i hope my uncle can fix some. But most is do to my install (hole locations) i think.
Most i dont think anyone is going to notice once i get it painted.

2

3

4

In reguards to pic #2 both my old and new door gfx piecesdid this. If the panel sat even with the edge of the door, it would get caught on the rocker panel as you open up the door. And as far as pic #3, both of my rockers have that same gap in the rear about 1/2 inch. Also, in one of my previous posts I mentioned that I saw a 91 RS in a parking lot. That car also has the same gap in the rear so that is the way it is supposed to be it looks like.

A friend of mine has a complete set minus the front bumper one. Not sure if he's interested in shipping but I can talk to him if you're interested. I know he's been trying to sell them...

If they are in good shape with all the brackets ill be interested actually thats perfect cause i alrdy have the front peice.

Hey, ask how much he wants for just the front spoiler ground effect cause that is the one that I need. Thands, Paul Moore

Nevermind, reread the post that he doesn't have the front spoiler piece.....

I installed the 91-92 rockers on my Trans Am and they seem to fit very good.

well those close up pics about sum up all the problems I am having so I guess that means I am not the only one.

I had the luxury of having my '91 RS as a parts donor. I am running LOTS of '91 parts on my '84!