so i lowered my car this weekend...

slo_5.0 · April 6th, 2009, 01:26 AM

well the title says it. i lowered my car this weekend

and now everytime i get on it real hard the whole back of the car lifts up. i am guessing to do with the pinion angle being changed. so my question is if i put aftermarket non adjustable rear control arms on will they get rid of that or am i going to have to but the adjustable ones to get my pinion angle right?

Bullitt95 · April 6th, 2009, 12:37 PM

You're definitely going to need adjustable uppers to correct the pinion angle.

WildWill · April 6th, 2009, 01:32 PM

the back lifts up when you get on the gas??? huh???

slo_5.0 · April 7th, 2009, 02:01 AM

ya bullet thats what i was thinking too. i saw in jegs they have a dual adjustable upper control arm that looks pretty good thats probably what ill end up going with.

its pretty nutty will. it feels like the rear of the car is lifting like 6 inches from sitting inside it. im not sure if its lifting that much at all or if its even noticable from the out side but its driving me crazy driving it.

stang94 · April 7th, 2009, 09:47 AM

Originally Posted by WildWill

the back lifts up when you get on the gas??? huh???

LOL, I thought the same thing too, when you get on the gas the back should go down not up, the front should come up.

I'm not poking fun at you, I want to know this. Can one of you guys explain, why/how an angle change with the pinion can do that.

WildWill · April 7th, 2009, 10:51 AM

Originally Posted by stang94

LOL, I thought the same thing too, when you get on the gas the back should go down not up, the front should come up.

I'm not poking fun at you, I want to know this. Can one of you guys explain, why/how an angle change with the pinion can do that.

+1, I am curious to know why that happens because that doesn't make any sense at all. I lowered my car 2" and mine doesn't do that...

Bullitt95 · April 7th, 2009, 11:47 AM

Try this for size:

Quick Performance :

WildWill · April 7th, 2009, 03:58 PM

Thanks Bullitt...
(I'm sorry to jack your thread man, but...)
Now that i think of it when I get on the gas in first, I sometimes get bad wheel hop. It was happening really bad all the time so I replaced my quad shocks and it helped A LOT! But I still get a little hop every once and awhile... Do you think this is because my pinion angle is wrong now that my car is so low? I thought I just needed to replace my lower control arms, but I guess maybe I need to replace my uppers as well??

97S281 · April 7th, 2009, 05:41 PM

You'll start poping u joints if you don't correct the angle.

M L Struck · April 8th, 2009, 11:45 AM

Originally Posted by 97S281

You'll start poping u joints if you don't correct the angle.

Nice 5.0 · April 8th, 2009, 12:16 PM

Maybe you have a bad shock and its not allowing the the rear to lower when you apply the gas. I would go around the whole car and shake each corner.

engineer1229 · April 9th, 2009, 12:22 AM

Originally Posted by stang94

when you get on the gas the back should go down not up, the front should come up.

Sorry but thats INCORRECT. You want the car to rise off the back tires when it launches.

WildWill · April 9th, 2009, 03:33 PM

Originally Posted by engineer1229

Sorry but thats INCORRECT. You want the car to rise off the back tires when it launches.

?????????????????????????????????????????????????? ????????

I'm confused....

Bullitt95 · April 10th, 2009, 08:42 AM

Originally Posted by WildWill

Thanks Bullitt...
(I'm sorry to jack your thread man, but...)
Now that i think of it when I get on the gas in first, I sometimes get bad wheel hop. It was happening really bad all the time so I replaced my quad shocks and it helped A LOT! But I still get a little hop every once and awhile... Do you think this is because my pinion angle is wrong now that my car is so low? I thought I just needed to replace my lower control arms, but I guess maybe I need to replace my uppers as well??

If you haven't already replaced the lower control arms, doing so will all but eliminate wheel hop. I have the Maximum Motorsports lowers and I removed the quad shocks; no wheel hop, and mine's lowered 1".
Slo_5.0, what you're experiencing with the car lifting up is called "anti squat". If you Google search that, you'll find several articles on what causes it and how to cure it.

Originally Posted by engineer1229

Sorry but thats INCORRECT. You want the car to rise off the back tires when it launches.

That doesn't sound right. You'd want the rear end to squat down slightly when you launch so that the weight is directed downwards onto the wheels to maximize traction.

WildWill · April 10th, 2009, 10:36 PM

Originally Posted by Bullitt95

If you haven't already replaced the lower control arms, doing so will all but eliminate wheel hop. I have the Maximum Motorsports lowers and I removed the quad shocks; no wheel hop, and mine's lowered 1".

Thanks man, I guess I need to look into that sooner than I anticipated.

You'd want the rear end to squat down slightly when you launch so that the weight is directed downwards onto the wheels to maximize traction.

+1, that's exactly what I thought...

97S281 · April 11th, 2009, 01:00 PM

Originally Posted by M L Struck

, I went threw 5 sets in 3 years. After I corrected the problem I never had to touch them again.

slo_5.0 · April 13th, 2009, 01:33 AM

thanks guys for all the input. ill definataly look it up bullet. just looking at my pinion angle it doesnt seem bad but i dont think its quite right either. im starting to think part of the problem might be that i didnt get the shorter pinion snubber, so when i get on my car and the axle wraps its hitting it and thus pushing the rear of the car up. im hoping to work on it some time this week and will keep ya posted.

+1 also on thinking the car should squat some in the rear when launching so weight is transfered over the rear axle.

engineer1229 · April 13th, 2009, 11:00 AM

No squat there.

Squatting the springs is just energy that could have been sent to the tires.

WildWill · April 13th, 2009, 03:40 PM

Originally Posted by engineer1229

No squat there.

Squatting the springs is just energy that could have been sent to the tires.

OK... that's not really a fair comparison. What you're saying is true... the rear springs shouldn't "squat" down drastically. But neither should they lift UP the rear end. That doesn't make any sense. That probably would mean something is wrong, because no matter what when you are accelerating weight is shifted to the rear wheels, and adding weight to the rear of the car should cause it to "squat" somewhat. Just thinking with common sense man.

96gtponyred · April 13th, 2009, 04:55 PM

Originally Posted by engineer1229

No squat there.

Squatting the springs is just energy that could have been sent to the tires.

so your telling me the rear of that car didn't squat when the front popped up

April 6th, 2009, 01:26 AM	#1
slo_5.0 Newbie 95 GT stock... for now slow Join Date: Jan 2009 Location: Cheyenne, Wy Posts: 15 iTrader: 0 reviews	so i lowered my car this weekend... well the title says it. i lowered my car this weekend and now everytime i get on it real hard the whole back of the car lifts up. i am guessing to do with the pinion angle being changed. so my question is if i put aftermarket non adjustable rear control arms on will they get rid of that or am i going to have to but the adjustable ones to get my pinion angle right?

April 6th, 2009, 12:37 PM	#2
Bullitt95 Hardcore Enthusiast 1995 Mustang GT auto 13.36 @ 105.0 Join Date: Apr 2007 Location: Al Ain, UAE Posts: 1,391 iTrader: 0 reviews	You're definitely going to need adjustable uppers to correct the pinion angle. __________________ 244whp/284wtq Mod list in My Garage

April 6th, 2009, 01:32 PM	#3
WildWill Hardcore Enthusiast 1995 Mustang GT Join Date: Oct 2007 Location: Solomons, MD Posts: 1,112 iTrader: 0 reviews	the back lifts up when you get on the gas??? huh??? __________________ GT40p heads, 1.7 crane RR's, GT40 u/l, MAC LTs, MAC o/r h-pipe, Flowmaster 40s, 65mm t/b, '03 Cobra Bilstein Struts, Tokico Bullitt Shocks, MM c/c plates, Eibach Sportlines, B&M shifter, 255lph f/p, RAM p/g clutch, Fidanza alum fly, rebuilt t-5

April 7th, 2009, 03:58 PM	#8
WildWill Hardcore Enthusiast 1995 Mustang GT Join Date: Oct 2007 Location: Solomons, MD Posts: 1,112 iTrader: 0 reviews	Thanks Bullitt... (I'm sorry to jack your thread man, but...) Now that i think of it when I get on the gas in first, I sometimes get bad wheel hop. It was happening really bad all the time so I replaced my quad shocks and it helped A LOT! But I still get a little hop every once and awhile... Do you think this is because my pinion angle is wrong now that my car is so low? I thought I just needed to replace my lower control arms, but I guess maybe I need to replace my uppers as well?? __________________ GT40p heads, 1.7 crane RR's, GT40 u/l, MAC LTs, MAC o/r h-pipe, Flowmaster 40s, 65mm t/b, '03 Cobra Bilstein Struts, Tokico Bullitt Shocks, MM c/c plates, Eibach Sportlines, B&M shifter, 255lph f/p, RAM p/g clutch, Fidanza alum fly, rebuilt t-5

April 7th, 2009, 05:41 PM	#9
97S281 Rollin' 18/ pushin' 2 1997 Saleen S281 Join Date: Feb 2007 Location: Zebulon N.C. Posts: 6,259 iTrader: 13 reviews	You'll start poping u joints if you don't correct the angle. __________________ MODS IN GARAGE NCMM ORIGINAL BLOWN 96-98 CREW MEMBER # 1

April 7th, 2009, 02:01 AM	#4
slo_5.0 Newbie 95 GT stock... for now slow Join Date: Jan 2009 Location: Cheyenne, Wy Posts: 15 iTrader: 0 reviews	ya bullet thats what i was thinking too. i saw in jegs they have a dual adjustable upper control arm that looks pretty good thats probably what ill end up going with. its pretty nutty will. it feels like the rear of the car is lifting like 6 inches from sitting inside it. im not sure if its lifting that much at all or if its even noticable from the out side but its driving me crazy driving it.

April 7th, 2009, 11:47 AM	#7
Bullitt95 Hardcore Enthusiast 1995 Mustang GT auto 13.36 @ 105.0 Join Date: Apr 2007 Location: Al Ain, UAE Posts: 1,391 iTrader: 0 reviews	Try this for size: Quick Performance :

April 8th, 2009, 12:16 PM	#11
Nice 5.0 Regular 1993 12.9 @ 105 Join Date: Jan 2007 Location: Raleigh NC Posts: 299 iTrader: 0 reviews	Maybe you have a bad shock and its not allowing the the rear to lower when you apply the gas. I would go around the whole car and shake each corner.

April 13th, 2009, 01:33 AM	#17
slo_5.0 Newbie 95 GT stock... for now slow Join Date: Jan 2009 Location: Cheyenne, Wy Posts: 15 iTrader: 0 reviews	thanks guys for all the input. ill definataly look it up bullet. just looking at my pinion angle it doesnt seem bad but i dont think its quite right either. im starting to think part of the problem might be that i didnt get the shorter pinion snubber, so when i get on my car and the axle wraps its hitting it and thus pushing the rear of the car up. im hoping to work on it some time this week and will keep ya posted. +1 also on thinking the car should squat some in the rear when launching so weight is transfered over the rear axle. Last edited by slo_5.0; April 13th, 2009 at 01:36 AM. Reason: more reply

April 13th, 2009, 11:00 AM	#18
engineer1229 Regular Join Date: Mar 2009 Location: Oklahoma Posts: 83 iTrader: 0 reviews	No squat there. Squatting the springs is just energy that could have been sent to the tires.

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