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Old 02-23-2019, 12:34 PM   #1
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Default My 2018 Roadtrek 210 Dually & suspension updgrades

Though I would share the outcome pics of my dually rear axle conversion and suspension upgrades. 11.5" American Axle.

Handles like dream at 80 mph one handed going through the mountains. Plenty of power for acceleration up the steep hills. Switched from 3.42 to 3.73 rear gear. (lost less than 2 MPG, but gained tons of power). Suspension 3" higher in front overall with 1" taller diameter tires. 2" higher in back. NO SPARE NEEDED which was a plus and also now the park assist sensors are functional as they are not blocked.
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File Type: jpg IMG_7480.jpg (286.8 KB, 45 views)
File Type: jpg Dually Rear.jpg (343.4 KB, 44 views)
File Type: jpg IMG_7510.jpg (286.9 KB, 55 views)
File Type: jpg IMG_7466.jpg (148.7 KB, 45 views)
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Old 02-23-2019, 02:06 PM   #2
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You're not the first to do this type of suspension modification, but I admire your work. I like the 210 layout but always thought the rear suspension needed to be widened with dually's to fill out the widened body.

Glad it worked out well and you like the result.
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Old 02-23-2019, 04:43 PM   #3
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Dana 60S or 70S differential?
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Old 02-23-2019, 05:00 PM   #4
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All GM Express vans went to American Axle 2010 and up, maybe even before but cannot verify. I used an 11.5" American Axle which is not available on any of the Express options. Express only used 9.5" and 10.5" even on cut a way duallys 2010-2019.
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Old 02-23-2019, 05:20 PM   #5
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What tires / load rating are you using?
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Old 02-23-2019, 06:31 PM   #6
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I am running Michelin LTX M/S2 235/80/17 Load E 3085 LBs. single., 2835 LBs Dual @ 80 PSI. So far I ran them 2400 miles 50 PSI front and 50 PSI rears cold. Need to check with GM techline to see if I can have them write a new BCM program to lower the trigger PSI on the TPMS. Right now the rears trigger low at 62 PSI, but do not affect ABS or stabiltrac. Just annoyance.
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Old 02-23-2019, 07:11 PM   #7
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Quote:
Originally Posted by valvegod View Post
Need to check with GM techline to see if I can have them write a new BCM program to lower the trigger PSI on the TPMS. Right now the rears trigger low at 62 PSI, but do not affect ABS or stabiltrac. Just annoyance.
What does the trigger code look like? Is it the TPMS symbol that illuminates, or does a warning appear in the message center? My '2011 3500 chassis has PSI status, but I have no idea what the trigger level is for front & rear and have never gotten a warning.

I manually check the display daily, but would like the peace of mind to know it will alert me before the tires go flat while on the road. I've never let out air to test, but fronts have been to 49 and rears to 68 without showing a warning. I'd probably want the warning to appear pretty close to those levels as I run 60 front/80 rear as my preferred settings when fully loaded (even though door frame sticker recommends only 50 front).
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Old 02-23-2019, 07:22 PM   #8
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Why are you running a lower rated tire on the rear?


With one rear wheel removed & used as a spare the remaining single tire in the rear will be limited to 2835 lbs of certified tire load instead of the rear axle limit which is usually used for single tire selection. (6084 / 2 = 3042 lbs IIRC)
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Old 02-24-2019, 05:04 PM   #9
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Yes TPMS symbol is the indication of low tire pressure.
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Old 02-24-2019, 05:07 PM   #10
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Hondo. Not running lower on rear. all 6 tires are the same. The tire companies de-rate the load capacity when running as duals. Look on the sidewall of any tire used on both applications and it will be stamped in the sidewall. Click the link below for an example of load ratings for Michelin truck tires.


https://www.michelintruck.com/refere...tion-tables/#/
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