GT5 control arms.

Stock wide-body cars have a tendancy to tramline pretty terribly.

I have installed offset front bushings on mine to try to address the problem. I'm not sure it helped much.

I've heard people rave about Johnny Woods' modification to the front arms. Pat Mical also does the same mod. They cut them apart, reform them, and weld them together. Look at Sticky #2 in this section - it's talking about exactly your problem, if I understand you correctly

Robert,

I thought you had the modified a-arms already?

All Pantera's (except the later Si) use the same a-arms. The only thing that was changed was the wheel width and offset, moving the width of the wheel further out rather than over the centreline, which leads to the tramlining and bump steer issues.

Std GT5 front wheels are 10" width, it sounds like you have a narrow body rear 11" wheel spaced out to meet front GT5 needs. IMO using 32mm of spacer is not something I would be comfortable with and puts a lot of stress on the wheel studs.

Can you measure and post the back spacing on your wheels?

Julian

Hi Julian,

I Measured the wheels and spacers and posted the data here: http://pantera.infopop.cc/eve/...044/m/812107194/p/25

The spacer I made uses the standard wheel studs and a special nut that sits inside the spacer. Then there is another set of studs built into the spacer itself.

The wheels came from Pantera East so I would have hoped that they would be right. I've never tried the front wheels on the rear, I'll do that today and see where they sit relative to the original body line.

Yes, I have Johnny Wood modified arms on the car now.

The front wheels are 11" wide and run a back spacing of just 11.5mm.

The rears are 13" wide and run a back spacing of 40mm.

Oops, sorry I totaly missed the update on the other thread.

So your wheels are 6.5" front and 5.4" rear backspacing. My old narrow body 11" wide whels were 6.5" backspace.

The stock 10" and 13" wide Campi wheels are 4.625" front and 4.75" rear, so no wonder you need spacers. Did you purchase the wheels, or did they come on the car?

I see from the other thread you have 4.5 degrees caster. I run a full 7 degrees on my GT5 and it still tramlines a little, at least I can drive with one hand now! Before the mod it was truly a white knuckle ride...

Julian

They came on the car Julian.

When I got it they were so far inside the gaurds that the car just looked stupid. Even with 35mm they are still inside the gaurd line, but it looks fine now. So with your old wheels I would only need a 3/8 spacer to be visualy in the right place.

It doesn't tram track very bad at all and I put this down to the quality of the Pilot Sport tyres, and with 4.5 castor it isn't too heavy to turn in, although for some reason it's heavier to go left than right!!

The worst thing is how much it nearly tears out of your hands when it hits a dip in the road, or worse still, a pothole on one side.

Robert,

What you describe is bump steer, later cars had spacers to lower the rack and bring the rack ends/tie rods more parallel, so that when the suspension compresses it doesn't alter the wheel direction. Check your rack for the spacers and the angle of your rack ends/tie rods. Bump steer kits are available from the usual vendors, or you could make one fairly easily. A good alignment shop should also be able help resolve this.

Here is Mike Dailey's page on bump steer and resolving it. http://www.panteraplace.com/page135.htm

Good luck,
Julian