Gain extra benefits by becoming a Supporting Member Click here find out how!
Classic Performance Products Classic Parts
American Auto Wire Classic Industries
Chevs of the 40sDanchuk Catalog
Hellwig Products IncPerformance Rod & CustomEcklers AutoMotive
Nu-Relics Power WindowsRain Gear Wiper Systems
Impala Bob's Bob's Chevy Trucks Bob's Chevelle Parts Bob's Classic Chevy



Username Post: K2500 Lowering?        (Topic#355057)
albyneau 
Senior Member
Posts: 149

Reg: 08-28-04
02-01-19 02:27 PM - Post#2758771    

Has anyone lowered one of these trucks without severely altering load capacity, or making a science project out of it? I just need a couple inches for ease of entry/exit, but don't want to hamper it's designed use(bad back).



 
454cid 
Valued Contributor
Posts: 3065

Age: 45
Loc: West Michigan
Reg: 02-18-12
02-01-19 03:34 PM - Post#2758774    
    In response to albyneau

If you're only looking for a couple inches, Probably just uncrank the torsion bars, and maybe use drop shackles in the rear?

I've never done it, and I'm not really a "lowered" truck person. Lowering 4x4s is done, but not super common.

99 K3500 RCLB


Edited by 454cid on 02-01-19 03:36 PM. Reason for edit: No reason given.

 
2plus2 
Member
Posts: 1186

Loc: Mission,BC
Reg: 02-03-05
02-01-19 03:38 PM - Post#2758775    
    In response to albyneau

Is there any lift blocks between the axle and leaf springs in the back?
Removing those will keep the load carrying the same and lower it and then decrank the tbars

69 Canadian Pontiac 2+2
factory L48 350 Chev,TH350,PW,PT
99 Silverado RCLB 4.8 NV4500 14BSF 4.10's locker 6" Procomp 35 bfg m/t's 9k winch cutout flares
07 Town Car Loaded,Tinted,Getting Bagged


 
bowtie44s 
Valued Contributor
Posts: 4140
bowtie44s
Age: 36
Loc: wv
Reg: 08-29-12
02-01-19 07:18 PM - Post#2758792    
    In response to albyneau

There is a big difference in 2wd and 4wd suspension. Richard will chime in and tell you everything you need to know about lowering a 2wd. Would smaller tires get it low enough?

Jeff

'88 Chevy K3500, aluminum head roller cam 511in³ stroker 10.5:1 compression, 96 NV 4500, 94-98 grille, 305/70-16 (33x12) BF Goodrich KM2s, 91 cluster swap


 
stumppuller 
"8th Year" Gold Supporting Member
Posts: 843
stumppuller
Loc: Canada
Reg: 11-01-04
02-01-19 07:21 PM - Post#2758793    
    In response to albyneau

If your due for new tires, switching from 265/75/16's to 225/75/16's would drop you about 1" (speedo would need to be re-calibrated).

As mentioned, the front torsion bars can be adjusted, but too much and you may not like the ride.

As for the rear, the leafs front mount is different on the 2wd models. I know the 1500 series frame gets it's increased height for the 4wd by using longer front brackets. The old 73-87 series did the same too. No doubt the 2500 frame is the same. It is a bit of a pain getting the rivets off though. See item 8 in the picture.

Attachment: 0114.jpg (208.46 KB) 1 View(s)




-91 Sierra C2500, now K2500
-81 Chev K20


 
scrambldcj8 
Senior Member
Posts: 2405
scrambldcj8
Loc: MA
Reg: 04-06-03
02-02-19 04:16 AM - Post#2758807    
    In response to bowtie44s

I'm guessing we're talking a bout a 4x4...OP posted K2500.

But yes, maybe some drop shackles for the rear and a few turns of the T bar to get it a bit lower..?



 
someotherguy 
Senior Moderator
Posts: 28868
someotherguy
Age: 48
Loc: Texas
Reg: 08-01-03
02-02-19 05:46 AM - Post#2758810    
    In response to scrambldcj8

  • scrambldcj8 Said:
I'm guessing we're talking a bout a 4x4...OP posted K2500.

But yes, maybe some drop shackles for the rear and a few turns of the T bar to get it a bit lower..?


Yep, sounds like the solution for a mild drop. The problem most seem to run into when lowering a 4x4 more than just a little bit is it puts the CV joints at an extreme angle and wears them out quickly. Shouldn't be a major issue with just an inch or two.

Richard

06 Silverado ISS / 06 Silverado SS / 06 300C SRT8


 
albyneau 
Senior Member
Posts: 149

Reg: 08-28-04
02-05-19 01:19 PM - Post#2759127    
    In response to someotherguy

Well, darn. I was really hoping there'd have been someone to offer up some application-specific or aftermarket shackle and/or bracket PN's from experience.

The quest begins~



 
someotherguy 
Senior Moderator
Posts: 28868
someotherguy
Age: 48
Loc: Texas
Reg: 08-01-03
02-05-19 01:39 PM - Post#2759128    
    In response to albyneau

If you're just looking for a couple inch drop, about the only thing you need to buy are some drop shackles for the rear. Just look 'em up based on your year/model as they are a fairly generic part. The 2WD pieces will fit your truck and cost about $50 for the pair.

For the front, de-cranking the torsion bars will be OK for a mild drop. If you crank them down too far your ride quality will suffer.

Richard

06 Silverado ISS / 06 Silverado SS / 06 300C SRT8


 
bowtie44s 
Valued Contributor
Posts: 4140
bowtie44s
Age: 36
Loc: wv
Reg: 08-29-12
02-05-19 02:59 PM - Post#2759138    
    In response to someotherguy

  • someotherguy Said:
For the front, de-cranking the torsion bars will be OK for a mild drop. If you crank them down too far your ride quality will suffer.



I think they are almost all the way down from the factory. A lot of people tighten them up to level it out which really does hurt the ride quality. "Leveling keys" or "lift keys" are even worse.

Do they make a drop knuckle or spindle (whichever you like to callit) for a 4wd?

Jeff

'88 Chevy K3500, aluminum head roller cam 511in³ stroker 10.5:1 compression, 96 NV 4500, 94-98 grille, 305/70-16 (33x12) BF Goodrich KM2s, 91 cluster swap


 
someotherguy 
Senior Moderator
Posts: 28868
someotherguy
Age: 48
Loc: Texas
Reg: 08-01-03
02-05-19 04:35 PM - Post#2759144    
    In response to bowtie44s

Ugh...are you 100% sure? Idid not know that. On some other torsion bar applications I know you can crank 'em down to lower, like my old '61 Apache.. I do know a GMT400 4x4 can be lowered as I have a friend that did it, and he went WAY down with it, suffering CV angle problems in the process. I don't recall him buying any parts to do the job with so I was under the impression he just cranked the bars down.

I did just check and both Belltech and Western Chassis offer lowering keys that fit GMT400's, and cost around $95-$130 a pair. The Westerns claim 1-4" and Belltech 1-3", "adjustable" ...

Richard

06 Silverado ISS / 06 Silverado SS / 06 300C SRT8


 
454cid 
Valued Contributor
Posts: 3065

Age: 45
Loc: West Michigan
Reg: 02-18-12
02-05-19 05:51 PM - Post#2759151    
    In response to someotherguy

I think if you go too low, you end up hitting the rubber bump stops with the lower control arms. I have no idea how many inches you could go before that happened. I suppose you could trim the bump stops or replace with urethane, but I'd want to be checking out CV axle angles like you mentioned earlier.

Where any of those drop spindles 8-lug, or just 6? Usually the dropped 4x4 guys (that's I've noticed) are Tahoes which of course are 6-lug.

I think If I wanted to drop a 4x4 a few inches, I'd look into shorter tire, as a possibility too. Honestly, I have no idea what's available, Though.



99 K3500 RCLB


 
bowtie44s 
Valued Contributor
Posts: 4140
bowtie44s
Age: 36
Loc: wv
Reg: 08-29-12
02-05-19 08:40 PM - Post#2759173    
    In response to someotherguy

  • someotherguy Said:
Ugh...are you 100% sure?



Well, all of the GMT400 and 800s I have looked at had way more up than they did down. Some of them were new and I know nobody had adjusted them. They had about 2 inches of bolt sticking out to adjust up,but only around 1/2 inch of bolt to go down. Those measurements are just estimates from the best I can remember.

I think your friend had to have had other parts. It would be nice to know for sure. When I bought my truck, the bolts were all the way down. Someone had definitely lowered the front of it. The axles were actually closer to level which should put less strain on the CVs. I had friends that cranked the torsion bars all the way up. The CV angles were pretty steep and the ride definitely suffered.

Jeff

'88 Chevy K3500, aluminum head roller cam 511in³ stroker 10.5:1 compression, 96 NV 4500, 94-98 grille, 305/70-16 (33x12) BF Goodrich KM2s, 91 cluster swap


 
Icon Legend Permissions Topic Options
Report Post

Quote Post

Quick Reply

Print Topic

Email Topic

166 Views
FusionBB
FusionBB™ Version 2.1
©2003-2006 InteractivePHP, Inc.
Execution time: 0.065 seconds.   Total Queries: 17   Zlib Compression is on.
All times are (GMT -0800) Pacific. Current time is 06:10 AM
Top