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Posted By: Dino Rear Sag - January 15th 2021 4:24 pm
1995 GMC 2500 Vandura 130k miles w/350 .Read a lot about sag and trying to fix w/o replacing springs. The front end floats a little and will be going with new shocks all the way round but rear is sagging. This van never had a trailer behind it and is low top conversion.,,,,
I understand rear sagging has a lot to do with how the front end feels and rides so wish to fix it all with shocks and some kind of spring helper.
Adjustable air shocks I've heard will not help but "Hellwig" may but read that if springs are warn out then won't.
New springs are like 275,5 leaf 2.25" each and Hellwig 9511-L35 is 276 + 150 for install kit.
I guess the question is,,,,will new shocks "KYB Mono" all the way round plus Hellwig work or am I wasting my time and should just get new springs? I don't want to go air ride...Thanks in advance.

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Posted By: frscke1 Re: Rear Sag - January 15th 2021 5:33 pm
New leaf springs is needed ... shocks will hold the weight ....for a while then your back to where you are now...
Posted By: Doone Re: Rear Sag - January 15th 2021 6:06 pm
Since you're going to replace the shocks anyway why not try a load levelling shock that comes with a coil spring for the rears, its worth a try.

Advance has them
monroe-load-adjusting-shock-absorber-58658

Then if that doesn't do it you could then do the leaf spring replacement. What do you think about that Frscke?
Posted By: frscke1 Re: Rear Sag - January 15th 2021 7:27 pm
Buy it right or buy it twice ...
Posted By: Rusty_Pancelode Re: Rear Sag - January 15th 2021 7:48 pm
I agree.
Anything other than replacing the springs is a band-aid fix that will just come back to haunt you later.

If the spring is the issue...
...replacing the spring is the fix.
Posted By: Lee7673 Re: Rear Sag - January 15th 2021 9:12 pm
Originally Posted by frscke1
Buy it right or buy it twice ...


Truer words have never been spoken!
Posted By: Doone Re: Rear Sag - January 15th 2021 9:17 pm
I stand corrected!

However, I would still put the load levelers in the rear when replacing the springs.
Posted By: Dino Re: Rear Sag - January 15th 2021 11:13 pm
Thanks for all the advise, this topic is all over the net and so many different ideas....I'll look into load levelers because yes it needs new shocks all way round think they are original.
I guess they are just old,,,like I said this van never pulled a trailer but must have carried some heavy loads....
Monroe is 58575 for my yr 1995 G2500
I like the KYB Mono 565032 for the front , I guess mixing brands does not matter?
Posted By: Dino Re: Rear Sag - January 15th 2021 11:38 pm
Those are for fronts,,,,says 58658 won't fit all I see is air shocks for my year....Good Grief!
Posted By: JAGI410 Re: Rear Sag - January 16th 2021 1:45 am
I had a similar sag and fixed it by replacing the 4/1 springs with 5/1 springs and it made a huge difference. Not just in looks, but ride and stability. This is the fix you need for yours. You'll only waste time and money replacing the other bits.
Posted By: Lionhead Re: Rear Sag - January 16th 2021 4:14 am
Ditto the leafs. Did my 90 G20 years ago.
Posted By: Dino Re: Rear Sag - January 16th 2021 2:05 pm
Thanks,,,looking for some 5/1 now...I see some 4/1 from $176 to $375 the 5/1 look real good,,,expensive but will be like new....
Posted By: Dino Re: Rear Sag - January 16th 2021 3:23 pm
22-1029HD direct replacement or 22-449 says up to 1991 and U bolts up...half the price and 5/1 Pad is same size but does U bolts up matter mine are down.....all other measurements are the same arch is 5 3/8 mine 4 1/2
Posted By: Dino Re: Rear Sag - January 16th 2021 4:28 pm
My bad my bolts are on top,,,going with 22-2029 HD 2000lb,,,5/1 $249 each at General Spring
Posted By: Dino Re: Rear Sag - January 18th 2021 2:01 pm
Ok,so new springs but been reading about "Air Lift" or Firestone air lift,,,seems to look good I may add air bags as well,,,,Air Lift 5000 57105,,,,didn't think u could do air bags for under $300. I don't mind stiff ride just want level and better up front handling......of course new shocks back and front. What do u think?
Posted By: Wedgy Re: Rear Sag - January 18th 2021 3:19 pm
Dino! welcome Do it!!

Plumbed separately, you can also level out. Best mod ever on the B350. And that's in addition to the Xplorer factory installed 2500# Hellwig helper spring pack.

I got tired of smacking the hitch pulling out of driveways real quick. Solved that issue, worth every penny. Not a high dollar mod, easy install. I hid the fill valves behind the license plate, they swivel out from behind the plate from top holes. Good Wrenching Dino
Posted By: Dino Re: Rear Sag - January 31st 2021 10:23 pm
Finally got the rear end up,,,,put new mono shocks all the way around and then went with "Air Lift" system in rear. Love it and raised the rear just right....
Posted By: shaggy Re: Rear Sag - February 01st 2021 10:05 am
Can you take some pic of the air lift installed on the rear?
Posted By: Dino Re: Rear Sag - May 17th 2021 5:22 pm
[Linked Image]Running 50 lbs on each side

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Posted By: Dino Re: Rear Sag - May 17th 2021 5:31 pm
Side view, they work and easy to install, I had muffler shop tack main bracket to the frame instead of bolts

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Posted By: Dino Re: Rear Sag - May 17th 2021 5:34 pm
Now can someone tell me if these factory wheel are 5x 4.75 or 5x5 I believe this year they went with 5x 4.75 looking for Baja wheels....255 70 15 from 235 15 75...factory says 127mm which is 5x5 but I think they are wrong.
Posted By: Dino Re: Rear Sag - May 17th 2021 6:36 pm
Just measured my wheels 5x 4.75 120 mm WTF???? NOT 5x5 Any thoughts?
Posted By: Rusty_Pancelode Re: Rear Sag - May 18th 2021 1:41 am
I have those wheels on a '99 Suburban.
100% sure they are 5x5.
My van is 5x5 as well... also 100% sure.

Make sure you're measuring center of one hole to the back of the second hole (making sure to skip a hole) since it's an odd number of bolt holes.
You measure center to center when you're measuring straight across on even numbered bolt holes.
Could that be what's causing the confusion?
Posted By: kursed Re: Rear Sag - May 18th 2021 12:49 pm
Only the early 70s G vans used 5x4.75 if I'm recalling correctly. I know my 82 is 5x5 and I believe the 77 or 78+ G vans went to 5x5.
Posted By: Dino Re: Rear Sag - May 18th 2021 2:47 pm
Remeasured they are 5x4.75 spare as well,,It is a GMC 2500 wonder if GMC went a different way then Chevy? 1995 GMC G2500

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Posted By: NateB Re: Rear Sag - May 19th 2021 2:18 pm
Strange. My 93 G20 is 5 x 5
Posted By: kursed Re: Rear Sag - May 20th 2021 12:11 pm
Yes, very weird. You've got a strange unicorn there. Same front and rear? I've seen odd ball sizes where someone has swapped in different rears before.
Posted By: Dino Re: Rear Sag - May 21st 2021 1:46 pm
I stand corrected I measured wrong,,,,pointed out by a senior member I do have 5x5......my bad.....still looking for some nicer wheels or just going to put 255 RWL on these wheels....
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