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Subframe lift.

rrwantr
Explorer
Explorer
Just finished a 2 day project of putting a subframe under our Jayco to get it close to being level. Sits much better now. Glad I decided to take the time to do it. Will also definitely help in some of the boon docking we do.

24 REPLIES 24

routemaster
Explorer
Explorer
laknox wrote:
routemaster wrote:
What size is the wall thickness of the hollow box section welded to the frame?


Here's the OP's response to me on 6-1 at 3:01 PM:

"I thought about it, but figured this is much stronger than stock as it is. .250 wall on the sides with additional .120 walled cross members. Additional welding on the joints. .250 thick hangers vs 3/16. Thicker shackles."

Lyle


Thanks very much.
Den.
2017 Landmark Arlington 365
2015 Silverado LTZ 3500 c/c LWB.

laknox
Nomad
Nomad
routemaster wrote:
What size is the wall thickness of the hollow box section welded to the frame?


Here's the OP's response to me on 6-1 at 3:01 PM:

"I thought about it, but figured this is much stronger than stock as it is. .250 wall on the sides with additional .120 walled cross members. Additional welding on the joints. .250 thick hangers vs 3/16. Thicker shackles."

Lyle
2022 GMC Sierra 3500 HD Denali Crew Cab 4x4 Duramax
B&W OEM Companion & Gooseneck Kit
2017 KZ Durango 1500 D277RLT
1936 John Deere Model A
International Flying Farmers 64 Year Member

routemaster
Explorer
Explorer
What size is the wall thickness of the hollow box section welded to the frame?
2017 Landmark Arlington 365
2015 Silverado LTZ 3500 c/c LWB.

rrwantr
Explorer
Explorer
garysol wrote:
I am still at a bit of a loss as to why a late model 5th wheel needs a lift when being towed by a stock height late model 1 ton truck. Seems to me that I would be PISSED at either Jayco or Ram. I see a lot of late model Dodges towing 5th wheels (me included) so it sure seems like Jayco is dropping the ball by not allowing for more pinbox adjustment or by building there trailers to low or something.......


I agree...and it's not because it's "half ton" towable. I compared my box/bed height to some new half ton 4x4s and I'm within 2", so even the half tons would be towing quite unlevel as the 5" didn't even get it there. With larger tires it should be real close.

garysol
Explorer
Explorer
I am still at a bit of a loss as to why a late model 5th wheel needs a lift when being towed by a stock height late model 1 ton truck. Seems to me that I would be PISSED at either Jayco or Ram. I see a lot of late model Dodges towing 5th wheels (me included) so it sure seems like Jayco is dropping the ball by not allowing for more pinbox adjustment or by building there trailers to low or something.......
2020 GMC Canyon
2022 NoBo 19.2

rrwantr
Explorer
Explorer
laknox wrote:
rrwantr wrote:
laknox wrote:
Looks very nice. Personally, though, I think I might've carried the sub-frame out another 6-12" on each end to add some more support, but that's just me.

Lyle


I thought about it, but figured this is much stronger than stock as it is. .250 wall on the sides with additional .120 walled cross members. Additional welding on the joints. .250 thick hangers vs 3/16. Thicker shackles.




I was thinking more about stiffening the main frame...

Personally, an Eagle HT is on my short list. Shouldn't need a lift if I stay with my '02 D'max, though.

Still, a very clean job.

Lyle


Thanks! Understood. The 2 added 2x6 .120 walled crossmembers should help with stiffening the frame some. Agree more would help, but then eventually I'd have a whole new frame and be 2x as heavy. ๐Ÿ™‚

laknox
Nomad
Nomad
rrwantr wrote:
laknox wrote:
Looks very nice. Personally, though, I think I might've carried the sub-frame out another 6-12" on each end to add some more support, but that's just me.

Lyle


I thought about it, but figured this is much stronger than stock as it is. .250 wall on the sides with additional .120 walled cross members. Additional welding on the joints. .250 thick hangers vs 3/16. Thicker shackles.


I was thinking more about stiffening the main frame...

Personally, an Eagle HT is on my short list. Shouldn't need a lift if I stay with my '02 D'max, though.

Still, a very clean job.

Lyle
2022 GMC Sierra 3500 HD Denali Crew Cab 4x4 Duramax
B&W OEM Companion & Gooseneck Kit
2017 KZ Durango 1500 D277RLT
1936 John Deere Model A
International Flying Farmers 64 Year Member

rrwantr
Explorer
Explorer
laknox wrote:
Looks very nice. Personally, though, I think I might've carried the sub-frame out another 6-12" on each end to add some more support, but that's just me.

Lyle


I thought about it, but figured this is much stronger than stock as it is. .250 wall on the sides with additional .120 walled cross members. Additional welding on the joints. .250 thick hangers vs 3/16. Thicker shackles.

Jerry_B
Explorer
Explorer
Outstanding!
Jerry B
Mobile Suites 36TK3

45Ricochet
Explorer
Explorer
Nice work, looks great!
2015 Tiffin Phaeton Cummins ISL, Allison 3000, 45K GCWR
10KW Onan, Magnum Pure Sine Wave Inverter
2015 GMC Canyon Toad

Previous camping rig
06 Ram 3500 CC LB Laramie 4x4 Dually 5.9 Cummins Smarty Jr 48RE Jacobs brake
06 Grand Junction 15500 GVWR 3200 pin

laknox
Nomad
Nomad
Looks very nice. Personally, though, I think I might've carried the sub-frame out another 6-12" on each end to add some more support, but that's just me.

Lyle
2022 GMC Sierra 3500 HD Denali Crew Cab 4x4 Duramax
B&W OEM Companion & Gooseneck Kit
2017 KZ Durango 1500 D277RLT
1936 John Deere Model A
International Flying Farmers 64 Year Member

rrwantr
Explorer
Explorer
The steps are actually just about right now. Prior to this the bottom step was only about an inch or so off the ground. Now it's about the same as the rest of them. The stabilizers could use some length, but then I'd lose clearance back there....so probably just some blocks.

WeBeFulltimers
Explorer
Explorer
Now to modify the steps and stabilizers!
2012 Ford F-350 PSD SRW ** CURT Q24 ** 2018.5 MONTANA 3791RD

ckwizard777
Explorer
Explorer
Nice work,
That sub-frame will make everything stronger.
Ken & Deb
2008 Montana 3400
2007 Chevy 3500HD CC,LB Dually 8.1