Coil Spring Reccomendation
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Joined: Sep 2012
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Coil Spring Reccomendation We are building a 49 Plymouth which we have put a 78 Trans-Am front subframe in. We have put an LS1 and a 4L60E transmission in. The front end is pretty light compared to the original setup and the upper control arms are bottoming out on the frame.
This happens even when we put 2 x 200 lbs. guys on there. Instead of guessing and trial and error we were looking for a recommendation or someone that might have done a similar conversion. Thanks for your help.
This happens even when we put 2 x 200 lbs. guys on there. Instead of guessing and trial and error we were looking for a recommendation or someone that might have done a similar conversion. Thanks for your help.
TECH Enthusiast
Joined: Jul 2010
Posts: 593
Likes: 29
From: Florida
We are building a 49 Plymouth which we have put a 78 Trans-Am front subframe in. We have put an LS1 and a 4L60E transmission in. The front end is pretty light compared to the original setup and the upper control arms are bottoming out on the frame.
This happens even when we put 2 x 200 lbs. guys on there. Instead of guessing and trial and error we were looking for a recommendation or someone that might have done a similar conversion. Thanks for your help.
This happens even when we put 2 x 200 lbs. guys on there. Instead of guessing and trial and error we were looking for a recommendation or someone that might have done a similar conversion. Thanks for your help.
also try http://www.moog-suspension-parts.com...il_Springs.asp
you may have to call them, mine was not listed but they had them.
TECH Enthusiast
Joined: Jul 2010
Posts: 593
Likes: 29
From: Florida
You could try cutting 1/2 to 1-1/2 off the springs, but it's clear you need a drop in spring rate, and lowering springs might help get the stance right but the ride would be horrible. IMO, I'd really consider a coilover setup with and adjustable lower spring seat, Strange, Afco, or QA1 should have what you need.
Any idea what the front weight is?
Any idea what the front weight is?
I went with global west lowering coil springs and tubular control arms in mine, and probably have a bit more of a weight drop (fiberglass, lexan, aluminum + LS1 replacing stock SBC). It rides fine, but could probably lose half a coil to be "dead-on" perfect. Your weight difference may negate the need for that. My car weighs in at around 2900. As mentioned before, adjustable coilovers might be the way to go. I wouldn't do them with stock lower control arms, though.
