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73sharkGary has a point. Maybe someone replaced the stock spring bolts with longer ones. I know I did that to lower mine to even it up with the front end. The front end dropped a little when I put on the American Racing Vector wheels because they had another half inch of negative offset which caused the front end to drop somewhat.
Not positive but I believe the stock rear spring bolts were 6" long.
1973 L-82 4 spd
Norsky
Maybe you can raise the rear with the spring bolts. Shorter?
If memory serves I believe longer bolts are needed to lower the rear ride height. Shorter bolts, or cranking them tighter, will raise the ride height. It seems counter-intuitive but it works.
Jim Olson 
"The Toys"...!!! Save the Wave! 
73sharkMaybe you can raise the rear with the spring bolts. Shorter?
If memory serves I believe longer bolts are needed to lower the rear ride height. Shorter bolts, or cranking them tighter, will raise the ride height. It seems counter-intuitive but it works.
You are correct but the OP wants to raise his ride height in the rear to match the front.
1973 L-82 4 spd
F4GaryWhich ever way. My point was that maybe his spring bolts are the problem. 🤷♂️
Dblancha79
Thanks Guys, I measured my spring end bolts and they are 8 inch's long with the nut screwed up to max thread run out. I ordered a threading die to cut some additional threads to get me closer to the 6-1/4 original equipment bolts. Will cut of the excess. Thanks again for the help.
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73sharkYou might check the head of the bolt to see if it's a Grade 8 bolt or not. I believe the 6" OEM bolts were Grade 8 for their strength. I mentioned this only because it might be hard to cut threads on it if it is a Grade 8.
1973 L-82 4 spd
manchestersharkJust my honest opinion, it may be easier to just buy a grade 8 bolt in the hardware store. They are not that hard to find. Chances are the one in the car may be the same quality, not O.E.M.
Dblancha79With a little work I was able to extend the threads on the 9/16 diameter grade 8 spring bolts. Car is all set, was able to get the correct ride height back. Thanks everyone for your help.
Norsky73sharkJust curious, was your 8" a Grade 8 bolt?
Edit: Oops, didn't read your last post. 😟
1973 L-82 4 spd
MackLS5In 2021 I rebuilt my 70 LS5 coupe using a TRW mono leaf 340 lb. rear spring from Muskegon brake co. They were very helpful with the purchase. The responsiveness in the rear has improved a lot. It’s a daily driver with typical curve roads medium speeds in my area of Va. I noticed the best ride improvement on the Blue Ridge pkwy last fall. It did raise my rear height about 1.5 inches, which has put it just above the front height. You can lower the ride height by using longer bolts. Good luck
