Suspension Enhancement for Thor Four Winds SD35 on 2016 F-550 Chassis
Updated 03/09/2026 | Published 03/06/2026
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Question:
I have a Thor Four Winds SD35 motorhome on a 2016 F550 chassis with a 6.7 L diesel engine. I have two questions for recommendations: 1 Sumo spring or Timbren? 2 Which size would I need for front and rear? Any help would be appreciated. Sincerely, Gary
asked by: Gary L
Expert Reply:
Hey Gary! The answer to your first question is both. I would use the higher rated Timbren SES # TFRSDE in the rear and then the SumoSprings # SSF-111-60 in the front.
With all of the weight in your motorhome the Timbren will do a better job supporting the rear, absorbing road shock, and cutting down on sway. The SumoSprings are still rated pretty high at 4,000 lbs, and they will give you a better ride quality up front compared to the Timbren.
Where are you headed once you get these installed on your Four Winds?
(click to enlarge)
Gary L.
3/6/2026
I just ordered! I’ll let you know how it performs! Gary
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SumoSprings Solo Custom Helper Springs - Front Axle
- Vehicle Suspension
- Towing/Load Leveling
- Bump Stops
- Suspension Only
- Heavy Duty
- Front Axle Suspension Enhancement
- SuperSprings Intl
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Gary L.
3/6/2026
We are headed to Alaska! Thank you for your quick reply. I will order both. Gary