Need a little rear spring advice on my 65 GTO - Pontiac GTO Forum
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post #1 of 14 (permalink) Old 09-21-2018, 09:55 AM Thread Starter
 
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Need a little rear spring advice on my 65 GTO

I bought new Moog springs to replace my old because the rear was much lower than the front. It's still low. Anyone know of another similar A body spring I could use? I'm currently looking at 69 big block El Camino rears.

Any help would be appreciated

Life is to short not to own at least one GTO!
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post #2 of 14 (permalink) Old 09-21-2018, 11:39 AM
 
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I once used spring spacers to raise the rear for bigger tires. They were basically just a stool under the spring. Don't see any today like those I had. Mine were just made out of galvanized steel. But these alum ones will do the same thing.

https://mcbayperformance.com/rear-bi...assenger-cars/

In my '69 Drag car I also used air bags, with more air in the right side. Here's some for a '65.

https://www.summitracing.com/parts/a.../applications/

Last edited by bigD; 09-21-2018 at 04:39 PM.
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post #3 of 14 (permalink) Old 09-21-2018, 12:49 PM
 
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Most 1st generation (64-67) GTOs sag in the rear. I have a 65 that had the same problem (Even more so after I rebuilt the front end) and I cured it by installing new springs and a set of air shocks. It cured the problem and now the car sits right. I run 60 psi ion them with zero issues.
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post #4 of 14 (permalink) Old 09-22-2018, 07:37 AM
 
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What is the distance from the ground to the: (1) running board ~18" inward of the wheel and (2) top of wheel well arch? Also do the same for the front.

You may have the right rear and wrong front....

1965 GTO Convertible 3 speed tri-power drum brakes originally

Current setup:
400 cu in with tri-power
4 speed Muncie
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post #5 of 14 (permalink) Old 09-22-2018, 09:49 AM
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Quote:
Originally Posted by uscfan1976 View Post
Most 1st generation (64-67) GTOs sag in the rear. I have a 65 that had the same problem (Even more so after I rebuilt the front end) and I cured it by installing new springs and a set of air shocks. It cured the problem and now the car sits right. I run 60 psi ion them with zero issues.
You think zero issues but the upper shock tower isn't designed to carry the weight of the car.
It is very difficult to weld them up after you damage them.
Remember GTO's sat a little lower in the rear from the factory so it isn't sag but intentional design.
Best to use spacers or airbags but it you go more than an inch you will need longer shocks.
Here is a pic of my '67 with one inch spacers which gives the car a slight rake.
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post #6 of 14 (permalink) Old 09-22-2018, 11:03 AM Thread Starter
 
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Quote:
Originally Posted by uscfan1976 View Post
Most 1st generation (64-67) GTOs sag in the rear. I have a 65 that had the same problem (Even more so after I rebuilt the front end) and I cured it by installing new springs and a set of air shocks. It cured the problem and now the car sits right. I run 60 psi ion them with zero issues.
My first choice is to find other springs that will cure the problem. I do have air shock but that is a temp solution to help offset extra trunk load. Guess I'll order the El Camino springs and give that a try.

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post #7 of 14 (permalink) Old 09-22-2018, 04:46 PM
 
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Dcgayhart,
My rear was sagging quite a bit on my 65 GTO. I Installed Moog 5237's and like the lift they added. Haven't put it back on the road yet, so can't speak to the dynamics.
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post #8 of 14 (permalink) Old 09-22-2018, 07:05 PM
 
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Springs wont change much if anything at all. The rate changes, not the height.

I used 2 inch blocks made for springs. Car has a nice rake now and the shock mounts are safe . As mentioned the shock mounts arent made to support the weight, the spring perches are.
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post #9 of 14 (permalink) Old 09-22-2018, 07:30 PM
 
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Originally Posted by LATECH View Post
Springs wont change much if anything at all. The rate changes, not the height.

I used 2 inch blocks made for springs. Car has a nice rake now and the shock mounts are safe . As mentioned the shock mounts arent made to support the weight, the spring perches are.
If you use station wagon springs, which are taller, springs will change the height. If you do a search using the Google Custom Search in the upper right hand corner, you will find an assortment of recommended springs. This has been cover a number of times and you should find a few good suggestions.
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post #10 of 14 (permalink) Old 09-26-2018, 09:40 PM
 
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I believe I used springs from a 72 olds wagon that had both the correct pigtail ends and ride height. I may be off a year or 2, but pretty certain Moog wagon springs did the trick on my 67. If your perches differ (possible you have no pigtails on top), you can cut the pigtails off and still get the ride height you are looking for, just measure for perch fitment before you cut.
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