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Old 09-24-2009, 05:55 AM   #1
SUB602
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K2500 suspension swap in a k1500 Suburban

My buddy has a 95 Suburban k1500 and he is swapping to 8-lug and going from 3.42 gears to 4.10 gears. He used parts from a 89 3/4 ton k2500 truck. He was able to swap over the lower control arms with the steering knuckles and all the front brake components. The front diff is alot bigger than the 1/2 ton. It bolted up to the top brackets just fine but he had to fab some lower brackets because the 3/4 ton diff hangs lower than the 1/2 diff does. He had to use the upper control arm out of the 1/2 ton, but swap the 3/4 ton ball joints to the 1/2 ton upper control arms so they would bolt up to the knuckle. He tried to use the 3/4 torsion bars but they r way too stiff so he is going back to the 1/2 ton bars. Im thinking no 454. Right now he says the front axles r binding but thats at full droop on the front suspension, and we think its the 3/4 ton Torsion bars causing the problem.

As far as the rear the 14 bolt bolted right in.

He just started this last week and he is currently not completely done alot of odds and ends, but should be done this weekend. Ill let u know how it turns out.

Last edited by SUB602; 09-25-2009 at 05:06 PM.
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Old 09-24-2009, 06:45 AM   #2
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Are the shocks in to limit the travel a bit? I mean the torsion bars shouldn't be making the suspension droop more than it ever can by hanging a wheel. So the binding may be a very real issue. I get that the upper axle mount point bolted up, but are you sure it is the same location? It may be far higher in the 1/2 ton versus the 3/4 ton, putting too much angle on the CVs from the get go.
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Old 09-24-2009, 07:01 AM
Posted in reply to sled_dog's post starting "Are the shocks in to limit the travel a..."
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No the shocks aren't in yet. The torsion bars r cranked so much that he has no rebound on the suspension. the 3/4 ton torsion bars r quite a bit bigger and have very little give. I told him to just adjust the torsion bars some more, but he wants to go back to 1/2 ton torsion bars for more give. As far as the Diff we checked clearances based on my 98 Sub and the 3/4 ton Diff is about the same. So well see.
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Old 09-24-2009, 02:13 PM
Posted in reply to SUB602's post starting "No the shocks aren't in yet. The..."
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dont know about this use of stuff but heres this info.

plow truck guys with 1/2 tons want bigger tbars. all tbars will fit. but the 3/4 and 1ton tbars are indexed diffrently than 1/2 tons.

you must swap the left bar to the right and the right to the left. the keys are the same basicly.

if not you will have to crank the bars so tight to even get the key in and setting on the adjuster block and not even have the bolt up a bit.

i have posted the list for ya. easy to use. match 2 of the letters and theres your bar and the third is the side. left or right.
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Old 09-25-2009, 07:21 AM   #5
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Todays update is gloomy. Way too much positive Camber and can't adjust it out with the combination of 1/2t upper control arms and 3/4T lower control arms and Knuckles. 3/4T upper control arms too wide to just bolt in so he tried the 1/2T arms. He even removed the 3/4T lower control arms and re-installed the 1/2T lowers, and the Camber is better but still too far out to adjust.

So next is to check the Knuckles and see if there is a difference in design. If so possibly swap Hub bearings and use the 1/2T Knuckle or install all 3/4T stuff and cut the upper control arm brackets and re weld them onto the frame to install the 3/4T upper control arms. Stay Tuned!!!
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Old 09-25-2009, 05:14 PM
Posted in reply to SUB602's post starting "Todays update is gloomy. Way too much..."
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Well just found out the swap isnt going to work without some major modifications to the front end. The brackets off the 3/4T are set-up different than the 1/2T. Thats why the Camber, and binding problems. He would have to cut the brackets off the 3/4T frame and graft them onto the 1/2 frame to get everything to line up and work correctly. He decided its gonna be too much trouble to make it work so he is just going the S.A.S. route.

Kinda sucks cuz i would have like to have seen it done, but now i will be involved in doing an S.A.S. on a Suburban similar to mine.

Sorry this Thread ended up this way. Maybe someone with a different combo can do this type of swap without as much trouble.
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Old 09-27-2009, 09:05 PM
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Guy on a local forum did this a number of years ago on his '94 Blazer K1500. Basically ended up completely grafting in the front suspension and all mounts from the 3/4 ton donor. Frame surgery and all.
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Old 09-28-2009, 04:59 AM
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Originally Posted by AJMBLAZER View Post
Guy on a local forum did this a number of years ago on his '94 Blazer K1500. Basically ended up completely grafting in the front suspension and all mounts from the 3/4 ton donor. Frame surgery and all.

Thats exactly what we found out, but my buddy didnt want to go thru all that. I told him thats why people dont like IFS, but he wanted to give it a shot before SAS. Oh well lesson learn.
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Old 09-28-2009, 05:23 AM
Posted in reply to SUB602's post starting "Thats exactly what we found out, but my..."
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This guy was all about the Silver Lake dunes so he wanted IFS no matter what. Last I heard he was going SAS a few years afterwards.
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booms and crunches sometimes solve problems.
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Why in hell can't the Army do it if the Marines can. They are the same kind of men; why can't they be like Marines!?
Gen. John J. "Black Jack" Pershing, US Army; 12 February 1918
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Old 09-29-2009, 05:48 AM
Posted in reply to AJMBLAZER's post starting "This guy was all about the Silver Lake..."
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My buddy decided to scrap the whole idea of lifting his 95 or doing an SAS swap. He decided to give the 95 Suburban to his son and bought an 88 3/4 Ton Suburban 4x4. 350/TH400/Np208 8-lug 14B, and 10bolt. Paid $1200 for it. Been sitting awhile so it needs some love, but its a solid axle truck with fuel injection. He looks like this now- instead of like this-.

He liked the cost of lifting a Soild axle truck over swapping an IFS to a Solid Axle.
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