Hello

Can anyone tell me why this is happening? 88 GT, stock suspension except for TFS drop springs.

When the car is on a hoist, the bump stop pad on the upper control arm touches and pulls off the upper ball joint boot (both sides of the car)

Any suggestions as to what causes this?

thanks

[This message has been edited by cam-a-lot (edited 05-20-2020).]

There are 3 primary causes.

Poor installation.
Age of the rubber boot allows it to crack and separate.
Excessive use of grease. Someone fills the boot with grease to the point of it popping the boot free or tearing it.

[This message has been edited by fieroguru (edited 05-20-2020).]

[This message has been edited by cam-a-lot (edited 05-20-2020).]

Are you aligned with a lot of camber? That will move the control arm inboard.

Maybe your crossmember is just assembled with the bump stop plates a little further outboard than most?

Now that I see the pic... the issue is the KYB shocks. They are longer than stock and allow the suspension to droop down further. The longer length also make them more prone to bottom out internally on lowered cars. I always recommend installing spacers between the lower t-bar and the lower a-arm.

From the picture, you are constantly riding on the (non-stock) bump stops as well.

If you have aftermarket boot like most w/ polly boots they are not made right and won't seal same way as OE or Boots came w/ Moog etc joints.

"Factory" and other "rubber" boots have a hidden metal ring in the base end that hold on the outer joint.
Moog and maybe others also have extra vent area on stud end so can't wreck them w/ grease.

For OE and others w/o "Moog vent boots," I made a tool to vent them.
small wire or "geek tool" w/ tip bent 90° push into stud opening is often enough to vent grease to prevent tearing them.
(if using screwdriver, heat to bend or most will break.)

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I believe it may be your after-market bump stop; 1988 Fiero bump stops are wedge shaped, while yours appears to be a round shape. You may be able to cut away a small portion on the offending side......

Hello Pete, is the sway bar link missing? If it is not there connected, does that let the suspension drop too far? Maybe I am missing something?

Thanks everyone

Sway bar link is missing for some reason- just noticed it and ordered a new set

I don't think the car rides on the bump stops anymore. It used to when the PO installed springs that were cut far too much and there was no suspension travel.

Good info on the KYB shocks- may try to play with them or replace them to see if the issue is resolved. Bump stops were from TFS- I don't think they are the issue since I recently replaced the front springs to the TFS drop springs, and now I have a lot more suspension travel.

Thanks everyone for your advice