How much lateral movement of the rear end - Chevelle Tech
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post #1 of 13 (permalink) Old Sep 1st, 10, 2:06 AM Thread Starter
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Steve
 
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How much lateral movement of the rear end

I understand that with using the stock rear arms there is the possibility of some lateral movement of the rear axle. I had planned on running the stock style rear suspension (4 link) with no pan hard bar, but want to run 285's or 295's. I want to make sure that if I shoot for .5 inch gap on both sides of the tire, that durring hard cornering it won't shift over to slice the tires.

I was planning on running the Currie lower and upper arms (Advise from Mark at SC&C) as my budget allows.

What are you guys seeing for lateral motion?

Steve

70 Chevelle Malibu family project.
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post #2 of 13 (permalink) Old Sep 1st, 10, 10:03 AM
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Kevin
 
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Re: How much lateral movement of the rear end

I plan to install a simple panhard rod if I ever get motivated...it's in the corner and I need to make brackets and cut my exhaust in front of the axle.

But the easy solution is just roll the fender lip a little. No sharp edge...no cut tires.

I have 295/50/15 on vintage slotted mags which have backspacing somewhere in the 3-4.5" range (never checked it) so the tires sidewalls are even with the chrome lip trim...which means there is an inch or so lip over the tires even though they are rolled up to the mounting surface for the trim.

They rub on hard sharp bumps, but never cut so it's harmless. Just sounds annoying.

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post #3 of 13 (permalink) Old Sep 1st, 10, 1:30 PM
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Marshall
 
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Re: How much lateral movement of the rear end

At least 1/2'' movement is possible with hard driving, a panhard bar assy will solve that problem.
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post #4 of 13 (permalink) Old Sep 1st, 10, 6:19 PM
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David
 
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Re: How much lateral movement of the rear end

I'm currently building a panhard bar for my 70, bar will be 31" long, and if my calculation's are correct it should hold me to about .051 of lateral movement. That's less than a 1/16 of an inch. Rear arms are from UMI Performance with their Roto-Joints, so I shouldn't see too much flex at the joints.
When your running a 345 series tire you need all the help you can get to hold everything in place.
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post #5 of 13 (permalink) Old Sep 3rd, 10, 7:02 PM
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Steve
 
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Re: How much lateral movement of the rear end

I have not seen any hard/real data on the A-body rear end lateral movement. But if you want to use all the fenderwell you have you *will* need to reduce the movement with something like a PHB or watts link.

Steve
1968 El Camino, 402 with TKO
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post #6 of 13 (permalink) Old Sep 3rd, 10, 9:46 PM
Jon
 
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Re: How much lateral movement of the rear end

Don't forget that if you are running C-clips the axles can shift a little, allowing the wheels to move a bit. Normally this is not noticeable, but if you are trying to max out the tire size it can cause problems.

You will need to nail the backspacing to fit a large rim and tire.

Good luck!

Jon U.

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post #7 of 13 (permalink) Old Sep 3rd, 10, 9:47 PM
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Re: How much lateral movement of the rear end

I have 295s on my GTO and everything was pretty close. I had rubbing issues on one side and I trimmed the lips a little at a time until I got it stopped. It required right about a half inch of clearance to get it stopped in hard turns.
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post #8 of 13 (permalink) Old Sep 4th, 10, 1:09 AM
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Re: How much lateral movement of the rear end

Quote:
Originally Posted by Roadbuster View Post
Don't forget that if you are running C-clips the axles can shift a little, allowing the wheels to move a bit.
Learned this the hard way when re-machining the caliper bracket for the C5 rear brakes. I was getting a rub sound only on left turns... needed an extra few thousands off that side.

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post #9 of 13 (permalink) Old Sep 4th, 10, 1:20 AM Thread Starter
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Steve
 
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Re: How much lateral movement of the rear end

Quote:
Originally Posted by 454RAT View Post
I'm currently building a panhard bar for my 70, bar will be 31" long, and if my calculation's are correct it should hold me to about .051 of lateral movement. That's less than a 1/16 of an inch. Rear arms are from UMI Performance with their Roto-Joints, so I shouldn't see too much flex at the joints.
When your running a 345 series tire you need all the help you can get to hold everything in place.
Got any pics of your setup?

Quote:
Originally Posted by Roadbuster View Post
Don't forget that if you are running C-clips the axles can shift a little, allowing the wheels to move a bit. Normally this is not noticeable, but if you are trying to max out the tire size it can cause problems.

You will need to nail the backspacing to fit a large rim and tire.

Good luck!
I've got a moser 9 inch sitting on the shelf in my garage.

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post #10 of 13 (permalink) Old Sep 4th, 10, 11:19 AM
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Tim
 
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Re: How much lateral movement of the rear end

i left 3/4 on the inside and 1/4 on the outside. you have to remember that the axle shortens when it rotates. the 1/4 is enough for a watts and phb for normal migration. not sure about a C4L though.

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post #11 of 13 (permalink) Old Sep 4th, 10, 11:42 AM
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Re: How much lateral movement of the rear end

Very little...



Since that pic, I've swapped to a 12-bolt, then swapped again to a Moser 9"
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post #12 of 13 (permalink) Old Sep 4th, 10, 12:35 PM
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David
 
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Re: How much lateral movement of the rear end

Oooops, I said my calculations were .051 lateral movement when actually its .064, the other number was for a Panhard bar of a different length, I've since had to change the length to 31". Now I know that amount of movement is with no bushing flex, C-clip play and other factors, it's just the amount that the bar would travel laterally if the suspension moved 2"
I'll try and post a pic of my progress with the bar so far. All I've done is make and weld the holding bracket to the frame and make the stiffening bar that ties both frame rails together. The only headache was that my exhaust had to go thru it. Currently I'm making the bracket that attaches to the axle.
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post #13 of 13 (permalink) Old Sep 4th, 10, 1:01 PM
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Re: How much lateral movement of the rear end

I'm running 285's on our 66 with Currie lower arms and Edelbrock uppers. Only time I have had rubbing issues is when the body bolts had worked themselves loose (something to check after a frame off...). Really thinking I can pull off 295's when I change to different wheels.
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