Torsion keys will they fit

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

Duallylife

Newbie
Joined
Jul 22, 2020
Messages
46
Reaction score
22
Location
Canada
I have a 93 k3500 I'm putting new stiffer torsion bars in, I have a set of upgraded keys from a 01 3500 4x4 the guy put in for plowing I can get cheap, will the gmt800 keys fit in my gmt400 though? I have been told by some they will, others no they are indexed differently?
 

Supercharged111

Truly Awesome
Joined
Aug 20, 2015
Messages
12,717
Reaction score
15,529
There are stiffer bars than K3500 bars? What are they from? If not a 400 God only know how they're clocked. Bone stock all these trucks can be cranked to the downstops so no need for keys in that instance. Also know that these bars, at least on the 400s, have a front and a back.
 

Duallylife

Newbie
Joined
Jul 22, 2020
Messages
46
Reaction score
22
Location
Canada
In all gm platforms, 400, 800 etc they have different load bars, marked by codes, I can't read mine but I'm pretty sure my vin printout said "GL" bars, and considering the fact this truck was factory ordered with a plow package with a big plow I would say they were. Right now my bars ARE cranked to max and I'm sitting on my bump-stops, and have been for a while without the plow. So I ordered XG bars. The reason I would like to switch keys is so its twisted a bit harder already without having the bars cranked as that's hard on front end parts and the plow is quite heavy and big. 9'2 wide 5" taller then average @1,100-1,200 lbs depending on if I have one or both wings.

15048309-LH (code XL) (Max torque 4626)
15048310-RH (code XL) (Max torque 4626)

15712407-LH (code WX) (Max torque 4863)
15712408-RH (code WX) (Max torque 4863)

15048311-LH (code XM) (Max torque 5638)
15048312-RH (code XM) (Max torque 5638)

15058267-LH (code YH) (Max torque 5913)
15058268-RH (code YH) (Max torque 5913)

15712409-LH (code WY) (Max torque 5913)
15712410-RH (code WY) (Max torque 5913)

15528957-LH (code GG) (Max torque 6709)
15528958-RH (code GG) (Max torque 6709)

15712411-LH (code WZ) (Max torque 7267)
15712412-RH (code WZ) (Max torque 7267)

15528963-LH (code GK) (Max torque 8615)
15528964-RH (code GK) (Max torque 8615)

15528965-LH (code GL) (Max torque 8782)
15528966-RH (code GL) (Max torque 8782)

15732338-LH (code XG) (Max torque 9054)
15732339-RH (code XG) (Max torque 9054)

15528959-LH (code GH) (Max torque 7161)
15528960-RH (code GH) (Max torque 7161)
 

Supercharged111

Truly Awesome
Joined
Aug 20, 2015
Messages
12,717
Reaction score
15,529
I'm curious what the OD is on those bars? I think the tags are gone on my bars now, but they were intact at some point. If yours are fully cranked and you're on the bump stops I'd say the bars are flat worn out. In any case, I suspect you'll have to experiment to find the correct keys.
 

Duallylife

Newbie
Joined
Jul 22, 2020
Messages
46
Reaction score
22
Location
Canada
Well maybe I'll wait to experiment with keys till the summer when I don't need it for plowing and mother nature isn't trying to freeze me out. As for OD if you mean how big round they are between the hex ends, they're about 36.5mm or 1.439in around. And yes I would they are flattened out, I suspect when the city use to own it the operators didn't really care if they dropped the plow while it was parked, and I'm guilty for doing it a few times myself.. Oops.
 

454cid

Sooper Pooper
Joined
Sep 5, 2010
Messages
8,067
Reaction score
9,036
Location
The 26th State
Il...The reason I would like to switch keys is so its twisted a bit harder already without having the bars cranked as that's hard on front end parts..

It makes no difference at all. The bars are preloaded the same, the new keys just cost money.
 

Supercharged111

Truly Awesome
Joined
Aug 20, 2015
Messages
12,717
Reaction score
15,529
Well maybe I'll wait to experiment with keys till the summer when I don't need it for plowing and mother nature isn't trying to freeze me out. As for OD if you mean how big round they are between the hex ends, they're about 36.5mm or 1.439in around. And yes I would they are flattened out, I suspect when the city use to own it the operators didn't really care if they dropped the plow while it was parked, and I'm guilty for doing it a few times myself.. Oops.

I meant in the middle. There was a 2mm difference between the bars I removed from my 1500 and the 3500 bars I swapped in.
 

Duallylife

Newbie
Joined
Jul 22, 2020
Messages
46
Reaction score
22
Location
Canada
I meant in the middle. There was a 2mm difference between the bars I removed from my 1500 and the 3500 bars I swapped in.
I know I'm way late, I got distracted changing the bars and other parts and totally forgot all about this untill I got searching through old posts, my bad, I'll just update incase anybody comes across this. Yes in the middle is where I took those measurements, I have never measured 1500 bars so I'm not sure what they measure at. My old GL (they were GL) bars and these new XG's measure the same in the middle, but let me tell you they are a h#ll of alot stiffer! I changed my LCA's at the same time as it was easier then pounding the bars out and I needed bushings anyway, so I went from the stamped LCA's to the forged.

I couldn't in anyway get the new bars in and cranked enough to get my keys in... Well I did with double torsion bar loading tools as I broke the tool using just one... And cranked as low as they would go I was sitting on the downstops and lifting the plow wouldn't even budge the suspension... I tried taking it around the block and there was no give at all... Thought I broke something the first pot hole I hit. So I took it home and thought about getting drop keys, to hopefully get less tension. I weighed all my options untill the last minute when I needed it for plowing, as I crawled under to put the keys back in just to get through the storm I realised if I flip the factory keys and put them in upside down they are basically "drop" keys, it was enough to actually get me about 1/2" off the downstops with no adjusting bolts in. So I put the bolt in and snugged it against the keys so the block the keys rest on couldn't fall out, it only drops 1/2"- 1" when I raise the plow (no more clapped out fender eating tire rub!) But now it rides very stiff, it is bearable because I'm use to rough rides, but if this was strictly a tow rig/ cruiser I would say it's too stiff.
 

Supercharged111

Truly Awesome
Joined
Aug 20, 2015
Messages
12,717
Reaction score
15,529
I know I'm way late, I got distracted changing the bars and other parts and totally forgot all about this untill I got searching through old posts, my bad, I'll just update incase anybody comes across this. Yes in the middle is where I took those measurements, I have never measured 1500 bars so I'm not sure what they measure at. My old GL (they were GL) bars and these new XG's measure the same in the middle, but let me tell you they are a h#ll of alot stiffer! I changed my LCA's at the same time as it was easier then pounding the bars out and I needed bushings anyway, so I went from the stamped LCA's to the forged.

I couldn't in anyway get the new bars in and cranked enough to get my keys in... Well I did with double torsion bar loading tools as I broke the tool using just one... And cranked as low as they would go I was sitting on the downstops and lifting the plow wouldn't even budge the suspension... I tried taking it around the block and there was no give at all... Thought I broke something the first pot hole I hit. So I took it home and thought about getting drop keys, to hopefully get less tension. I weighed all my options untill the last minute when I needed it for plowing, as I crawled under to put the keys back in just to get through the storm I realised if I flip the factory keys and put them in upside down they are basically "drop" keys, it was enough to actually get me about 1/2" off the downstops with no adjusting bolts in. So I put the bolt in and snugged it against the keys so the block the keys rest on couldn't fall out, it only drops 1/2"- 1" when I raise the plow (no more clapped out fender eating tire rub!) But now it rides very stiff, it is bearable because I'm use to rough rides, but if this was strictly a tow rig/ cruiser I would say it's too stiff.

Sounds like you put them in backwards. I did that and bent the tool trying to crank the bars enough to get the downstop in.
 

Duallylife

Newbie
Joined
Jul 22, 2020
Messages
46
Reaction score
22
Location
Canada
No I checked that a couple of times haha, mine actually came with a sticker that said "front" and the rotation was stamped on the other end with a arrow, so figure out which way the LCA is rotating them to figure out which side is which. Pretty fool proof.
 
Top