67-69 Firebird TECH Includes 69 TA.

          
 
 
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Old 01-30-2022, 10:42 AM
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gtobird gtobird is offline
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Join Date: Oct 2006
Location: Green Bay, Wisconsin
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Quote:
Originally Posted by Sport69 View Post
Great suggestions guy, thanks. I'll give these a try, but it's Winter again so everything will be on the back burner till Spring.

I'll check the shock length, and the rear shackles for binding. Tire pressure is at 32 lbs. all around so it sounds like that's good. If all else fails then I'll have to try a different set of leaf springs.

At least I have some things to check over now, I'll get back to you in the Spring. Thanks again, and Merry Christmas!
I'm going to add my two cents in support of the potential problem as outlined by others. I seriously doubt this problem has anything to do with the shocks or tire pressure.

As others have mentioned, your car sits a bit high both front and back, yet it looks relatively level. That tells me your back end has an issue with the springs and or shackles as they are installed. It's absolutely true that if your springs are too strong, your car "may" sit high and could potentially have a harsh ride. That said, there are two mistakes people make that cause both the front and back to sit high. Both have to do with bolting everything together before the vehicle has weight on its wheels. Again, per the suggestions above, it is very likely that the rear shackles were tighted with the weight of the body off the wheels. It certainly can then pinch the rubber bushings in the rear when the shackles / bushings are in the wrong rotational positon. What's happening is the bushings twist a bit as the springs flex during your ride. The problem when this mistake is made is that the rotational neutral position of the bushings / shackles is now with the body up high. This causes nasty problems in the ride and will cause the bushings to wear prematurely.

A very similar problem happens when the front control arm bushings are tightened before the cars weight is on the wheels. The front end sits high.
Of course, the front end issue could also be from using stiffer springs.

Anyway, if the issue is tightening things up before weight is on the wheels, the rear end issue can be fixed by proper installation of the rear bushings, shackles and springs, but your rear end will then sit lower when all is correct. Lowering the front will require properly setting the front control arm bushings if those are the issue. If it's high because of the front springs being too stiff, then change them.

You probably already know this, but don't take for granted the potential DANGER in doing any of this. The car / body / rearend and other things can suddenly drop when doing this if you don't support it properly. Springs by their nature are dangerous, especially the front.

On a different note, if your problems are none of the above, then I ask, is your car really bottoming out on the shocks, or are your rear tires hitting the inner wheel housing? I've seen it where people run larger tires (not referring to rim size) or have a different wheel offset and they bottom out on the inner wheel housing. I don't think that's the issue here since your car sits high, but didn't want to leave that out as a possible problem.

BTW just installed all new springs in my 68 convert. Sits good, bounces good, but haven't driven it yet.

Old Joe

 


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