Sprinter Suspension Improvements – Upscale Automotive’s Spring Assist Kit Review

This post may contain affiliate links.

If you’ve seen my other post, then you know about my efforts to improve the ride and handling in our Sprinter based RV.  To recap, my main complaints are handling in crosswinds, the roll in and out of parking lots, and being shoved around when 18 wheelers roll by.  To improve things, I’ve gone through some detail on setting my tire pressures (video on this process coming soon), and I’ve installed a Timbren SES kit on the front of the Sprinter.  The Timbren helped in subtle ways with handling, and was worth doing, but it was not the eureka moment I was looking for.

I had seen some positive reviews and comments on the Spring Assist Kit from Upscale Automotive, in Tualatin, Oregon.  They seem to be the aftermarket Sprinter experts; they have a number of modifications available, and they seem to be genuinely passionate about Sprinters.  I emailed them and described what I was looking for.  They recommended their rear Spring Assist Kit for my 2003 Sprinter.  It wasn’t cheap – over $500 including shipping.  I ordered it and located a shop to install it.

Full disclosure – there is none!  I paid full retail for my Spring Assist Kit, and Upscale Automotive isn’t sponsoring this review in any way.  I’m just a customer.

My kit arrived and, much like the Timbren kit, I was a bit amused by how simple things were.  There were a couple leaf springs with rubber bumpers on them, and some U-bolts.  That’s pretty much it.  You can see what came just as I unpacked it below.  Oh.  And there was a set of complete and detailed instructions.  Any competent mechanic should be able to work with this kit.

Uninstalled Spring Assist Kit from Upscale Automotive

I had arranged with Warner Truck Center in Salt Lake City to install the kit.  On my 2003 sprinter, the install required adjusting the ALB – which is a load braking device.  It was a linkage, a spring, and a threaded rod attached to my brake lines, and looked kind of “Rube Goldberg”.  (Newer Sprinters don’t have this.)  I wasn’t comfortable having just any shop mess with it, so I went to the authorized Sprinter service center.  The install was uncomplicated and completed without a hitch and on time (though there was a starting issue that surfaced, but that’s another story).

When I picked up the RV, I had a look underneath.  I could see that the new Spring Assist Kit was just beginning to engage with an unloaded RV.   I took a picture of that, and here it is.

Installed Spring Assist Kit


But how did it drive?

Wow.  Holy freaking wow.

The first thing I noticed is that I no longer bottomed out in the rear when backing out of the driveway.  Hallelujah!  But the real test was going to be our trek across the windswept windy windlands of Nevada on our upcoming trip west.

As soon as we got out on I-80 headed west, I could really notice a difference.  There was a huge improvement in handling in crosswinds.  There was now very little buffeting and very little rocking in the wind.  I could hear the wind, but not really feel it.  Passing trucks were a non-event.  But it wasn’t until we stopped that I realized how much of an improvement it was.

As we were headed west, we heard a strange buzzing noise from above.  It sounded like it was coming from our MaxxAir fan, and we decided to stop and take a look.  When we got out of the RV, it was almost difficult to stand it was so windy – we knew it was windy, but we had no idea it was THAT windy.  I was able to determine that the buzzing was indeed the MaxxAir fan – the crosswind was so violent, that it was causing the housing to vibrate and buzz in the wind (and the MaxxAir rides low and tight, so that’s saying something).  But with the suspension improvements – it was smooth sailing inside.

I can’t say enough about the Spring Assist Kit.  This was the improvement I was looking for.  Honestly, they didn’t help a whole lot with side-to-side rolling when going into and out of parking lots, but I’m starting to think that won’t ever be all that great.  But what I CAN say is that when I get another Sprinter-based RV, this is going to be the FIRST improvement I’m going to make.  I wish I had done this a long time ago.

Hats off to the folks at Upscale Automotive for making this kit – and they do make updated models for the newer Sprinters.  Worth every penny.

James is a former rocket scientist, a USA Cycling coach, and lifelong fitness buff. When he's not driving the RV, or modifying the RV (or - that one time - doing both at once), you can find him racing bicycles, or building furniture, or making music. In his spare time, he works for a large IT company.

    4 thoughts on “Sprinter Suspension Improvements – Upscale Automotive’s Spring Assist Kit Review

    1. Mitch Berger

      Have you tried a fresh set of KYB mid to high end shocks? Even a good quality shock only lasts 20-25k miles on my Ford van. We do hit quite a bit of dirt with the van so that wears them out sooner rather than later.

      1. James - Post author

        Interesting. Honestly, after adding the spring assist kit, I’ve lost the motivation to improve the ride any further. She’s still riding well.
        I already had the Koni Reds. They’re what most people suggest upgrading to on the Sprinters. I guess I never considered that they may be worn out. I do have 125k miles on her now…
        If I notice the ride start to deteriorate, that’ll be what I think of first. Thanks!

    2. James - Post author

      I’m sorry to hear that you’re still having trouble, even after installing the Spring Assist Kit. The Westfalia is quite a bit taller than my Sprinter, so maybe that has something to do with it. Also, most of my heavy stuff is down very low, which helps with stability.
      Upscale also recommended that the Koni shocks be adjusted to 100%. Perhaps that is something you could try?

    3. Juju pang

      I had upscale install the spring assist kit 5 years ago on a sprinter Westfalia and was disappointed with results. Still a problem with wind and passing trucks. I also have Konis shocks installed.


    Leave a Reply

    Your email address will not be published. Required fields are marked *

    Comment moderation is in use. Please do not submit your comment twice -- it will appear once we have had the chance to review it.