Rear suspension help

SWFLGT · Feb 18, 2014

Hoping for a little guidance...
'98 GT with Eibach Sportline spring is what I have right now. The car is so low, the rear diff hits the under-body. It has cut the return fuel line once and was on it's way to do it a second time. I replaced that section of fuel line with a custom piece re-routed out of harms way, but still the diff hits the body with a bad bump and I would like to solve this. I also have a rear shock that is blown out and leaking oil.

My pockets aren't very deep but I would like to get quality stuff that will last so I was thinking of these to start...http://www.maximummotorsports.com/Mustang-Coil-Over-Kit-with-Springs-Front-Bilstein-Struts-P506.aspx.

I appreciate any guidance.

daltonduree · Feb 18, 2014

get new shocks and bump stops. fox body shocks since its lowered. post some pics of car

Ferocious · Feb 18, 2014

Sounds like you're missing your bumpstop. The rear axle/dif is not supposed to hit the body of the car, that's why we have a bumpstop located right above it.
If you want you can order a shorter bumpstop from maximum motorsports to give the rear more travel.

http://www.maximummotorsports.com/Pinion-Snubber-Urethane-1979-2004-solid-axle-P994.aspx

I would also look into some new shocks. Sounds like they may be blown and causing your rear end to bounce all over.

SWFLGT · Feb 18, 2014

Come to think of it, while under the car last week I didn't notice any on the axle and you are right Ferocious the passenger side is leaking. The rear doesn't seem to bounce much that I feel but I am not sure how long it's been that way.

Any thoughts on the coilover kit, it seems a few folks recommend them.

Here are a couple pics as she sits minus the hood.

Ferocious · Feb 18, 2014

Maximum Motorsports makes an excellent coilover kit for the front and rear. However, you mentioned your pockets aren't very deep and I believe MM makes one of the most expensive (yet one of the best) coilover kits. If it's in your price range, i'd go for it. A good spring rate with some bilsteins on all 4 corners will be a nice, firm ride.

SWFLGT · Feb 19, 2014

Good deal, I think I can do the Maximum kit, just can't do front and rear at the same time. I did link the front and not the rear but you knew what I was getting at... any recommendations on which springs to get?

Sent from my SM-N900T using Tapatalk

robb15033 · Feb 19, 2014

If you e-mail MM, they will respond and help you with choices. They offer nothing but quality stuff.
Your new shocks will have bump stops, and you can add a new snuber too.

Quick reference information to assist in decision making.
Ford Mustang (94-04).
BACK FRONT (lbs/in)
Stock Springs= Front: 420 lb/in, Rear: 200 lb/in
FRPP:
B- 425/530 200/300
C- 650 200/300
F- 460/570 170/310
G- 460/570 200/250
BBK:
650 250
Steeda:
650 250
Eibach Pro Kit:
456/570 200/251
Eibach Sportline:
425/550 200/251
H&R Sport:
490/575 250/285
H&R Race:
750/850 260/280
Vogtland:
440 552

H&R Sport Springs= Front: 490-575 lb/in, Rear: 250-285 lb/in
H&R Super Sport Springs= Front: 700-760 lb/in, Rear: 275-300 lb/in
H&R Race Springs= Front: 750-850 lb/in, Rear: 260-280 lb/in
H&R Super Race Springs= Front: 950-1050 lb/in, Rear: 260-300 lb/in

Eibach Pro-Kit Springs= Front: 456-570 lb/in, Rear: 200-251 lb/in.
Eibach Drag-Launch Springs= Front: 342-462 lb/in, Rear: 180 lb/in, Right Rear: 180-349 lb/in.
Eibach Sportline= Front: 425-550 lb/in, Rear: 200-251 lb/in

SWFLGT · Feb 19, 2014

Thanks for that info Robb, I can see that being quite helpful in my decision. I will take the advice and contact MM and see what they would recommend.

Ferocious · Feb 19, 2014

The spring rate and length is all dependent on what your intentions are for the car.
For drag racing go with a soft spring. For track use go with a stiff spring. For a daily driver pick something in the middle.

Regardless, give MM a call and they will point you in the right direction like Rob said.

SWFLGT · Feb 19, 2014

Thank you, much appreciated.

DropTopPony · Feb 19, 2014

From the pics your car isn't that low to be slamming into the body all the time. Your shocks are definitely toast or you are riding around with some big uns in the back seat.

SWFLGT · Feb 20, 2014

Hah, no big-uns lol and it doesn't happen all of the time but it does happen. I am sure both shocks are done considering the one is leaking. Great excuse to upgrade though.

OnyxCobra · Feb 20, 2014

just note the shocks aren't included with the coilover kit so you'll need those regardless. the car doesn't sit very low so i'd make sure the pinion snubber is in good condition and then maybe throw new shocks on there and see how it rides.

SWFLGT · Feb 20, 2014

Thanks man, I feel it sits low because I scrape and rub over almost every speed bump I have been over, my rear tires rub the fenders as well.

robb15033 · Feb 20, 2014

The helpful info these good guys gave you regarding the pinion snubber will be in effect when going over speed bumps sometimes. I think I'm right is saying that MM happens to sell the most forgiving, flexible style too. They just seem to got it all!