Club Cobra - Rear end alingment ?!?!

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Rear end alingment ?!?!

Discussion Tools

02-16-2018 11:21 AM - permalink

Haas_guy

Hoping for a little advise. I’m to the point where I’m ready to mount the body, but before I do that I figured I’d take a couple measurements. I found the rear end is 1/2 farther on the drivers side than on the passenger side. At ride height the passenger side is at 90”, the drivers side is 90-1/2”. Anyone else run into this? Car is setup for an 8.8 rear end.

I tried taking measurements from the frame, but nothing is a reliable starting point.

Any suggestions?

02-17-2018 05:53 AM - permalink

Harry Truppner

Hello Haas guy,
I would think that you would need to find that reliable starting measuring point on the frame to verify the tracking of the rear tires. Maybe finding dead center of the front cross member as the point to triangulate to equal points from the centerline of the rear axle housing. You could try locking your steering at straight and roll the chassis along a line to verify that the rear is tracking OK or not. Does your rear have adjustable links?

02-18-2018 08:46 PM - permalink

40k Later

My ride height on the drivers side is and always has been just over 1/2" higher than the passenger side. I've always assumed this to be the cutout for the wheel well was cut out more on the drivers side. Confirm by laying it on a level surface and measure. As far as side to side I don't have that issue. The only cause that I can see would be your frame may have the Control arm attach brackets located incorrectly, all four of them. To some a half inch is a mile to others, big whoop.
Just a side note. Our cars cannot fit a good sized tire in the back which not only looks anemic it also doesn't help with traction, mine are 275/45/17's and there isn't more than 1/4" clearance between the tire and the coil spring/perch. I'd like to get rid of the coils, cut the structure away, get rid of the shocks and cut out the towers and weld in an upper support and put coil over shocks on. It frees up 3" more

02-19-2018 08:16 PM - permalink

Beastly

Haas

I think you are describing a axle alignment issue. People (me included) have had to cut and reweld the control arm mount.
However- I found that I was never happy with the rear wheel location/clearance until i put adjustable control arms. At exactly 90 inches of wheel base- i found the control arm swing caused my tire to rub inside front of wheel well. My magic number was 90.75 This allowed full compression/travel of rear with no rub. Good luck -Beastly

02-20-2018 02:50 PM - permalink

Haas_guy

Beastly, 40k,

Thank you for your response.

I’m thinking the rear mounts where welded in the wrong position. Uppers and lowers. Once I set my rear end pinion angle, the wheelbase was shorter by 3/4” and there is no way possible to attach the uppers. I have the frame set and leveled on blocks in the rear, with the outside frame rails at 5-3/4” ride height. Is this too low? Everything has gone smooth with this build until now. My frustration levels are at an all time high.

Thanks
Jeff

02-20-2018 05:26 PM - permalink

Beastly

Haas,

my car is on stands as we speak or i would measure for you. Strange I have not had anyone ever mention the uppers being in wrong place but always the lower. I just measure the upper rear distance from bolt hole on frame to bolt hole on upper dif is exactly 9 inches. I post pics in a few min

02-20-2018 05:35 PM - permalink

Beastly

the lower mount is eactly 4 inches from edge to frame sorry about crappy pic

02-20-2018 05:36 PM - permalink

Beastly

upper is 9 inches from bolt hole to bole hole center.

02-21-2018 04:38 PM - permalink

Haas_guy

Thanks Beastly. I’m going to crawl back under tonight and see if I can figure out what’s wrong

Jeff

03-27-2018 04:19 PM - permalink

52chevyred

We had to totally cut & re-weld the rear mounts: they were way off. One thing I learned in 4 years: if ONE of these has a problem, they ALL have the same problem. Streetbeasts never fixed anything.

The bracket for the rack & pinion steering was "upside down": fixed that and many more things. Good Luck! This group is full of answers.

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