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Author Topic:   Rear Suspension Help!
Dirt Roller

Total posts: 14
posted December 05, 2004 02:21 AM  
Hi all, just thought I'd jump on here to see if I could get some help with a very basic leaf spring set up in my Australian AMCA National. AMCA's are very similar looking to your Mod's, but our rear end is only a basic Multi leaf spring (steel), panhard rods are optional, but most don't run them ( I Don't). I thought I'd ask some questions here, as seeing you guy's in the states run such complex rear ends, some guy's here would know basic leaf springs very well.
I'm just wondering if the multiple front mounting holes for the leaf springs to the chassis, have any other effect than just ride hight adjustment, there are three holes vertically inline on the front chassis mounting point for each spring, the rear of the spring is mounted on sliders. The springs themselfs are mounted in a toe in/heel out fasion, apparently this helps with latteral loads and eliminates the need for a panhard rod, so dose anyone know what effect is achieved by moving these front spring mounting points to different positions? Is it just ride hight, or is there more to it? Any help would be gratefully appreciated!

Thanks Dave. Australia.

Dirt Freak

Total posts: 351
posted December 05, 2004 08:15 AM  
Check the tool box section, There is good info on leaf springs in there.

Dirt Maniac

Total posts: 113
posted December 05, 2004 09:38 AM  
I always run mine in the top hole as it gives more angle as on a bar car. A lot of it has to do with how much arch your springs have, mounting points on the rear, lowering blocks and I like shakles for the adjustments as far as controlling the lift on the left side. Go to or ask fr1 on this forum for the deep stuff, they know more than I do.

unregistered Total posts: 113
posted December 05, 2004 09:46 AM           send a private message to orange2mod   Edit/Delete Message   Reply w/QuoteBBBBBB
I reallly don't know much about leaf cars, so one of you other guys will have to confirm this. If you mount the left side in a higher hole than the right side, would that help to produce some rear steer? I'm thinking that it would have the same effect as when we run our bars at different angles.
Good luck, mate.

Dirt Maniac

Total posts: 145
posted December 05, 2004 10:11 AM  
I agree, go to and read modified tech articles. There are several qualified individuals responding about leaf springs. Ask questions, the responses are pretty quick. BTW, spring sliders can bind up and negatively effect the car. We only run spring shackles, particularly if you run a coil spring on the rr.

Dirt Full Roller

Total posts: 36
posted December 05, 2004 10:14 AM  
raising the front mount if you put more arch in the leafs will help with forward traction,other than that it is just a ride height adjustment.we like about 9" arch in the left rear and 8" arch in rr.also unclamping the rear of the springs help(just let them spread apart while under acceleration)a panhard rod will just bind the suspension up because it is working in an arc and the leafs work straight up and down.our experience with leafs has taught us that they are best by themselves,no lift bar ,no pull bar,just 2 shocks and a damper when needed

[This message has been edited by HEAVY DUTY (edited December 05, 2004).]

Dirt Roller

Total posts: 14
posted December 05, 2004 02:33 PM  
Thanks for all the replies, they've been very helpfull, I probobly should have add that we're only able to run 2 shocks, no coilovers. I think Heavy Duty had the idea of what we run, Thanks all!

[This message has been edited by Kangakountry (edited December 05, 2004).]

Dirt Maniac

Total posts: 161
posted December 05, 2004 06:27 PM  
Kangakountry,check your PM. Let me know if you found the info if not i'll get it for you. cd2

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