Got back from a 6,000 "maiden voyage" with my new F350 diesel dually (2016). Prior to leaving, I installed Timbrens as they got good reviews. Here's my experience:
If you are looking for jounce reduction, the Timbrens do a good job. HOWEVER, while towing my Bighorn 3010 RE, the tail end of the truck dipped down about an inch, which was enough to throw the headlights off - it was literally difficult to see on country roads at night and I kept getting bright light flashes from on-coming traffic. I have a Crew Cab and long bed with a 172" WB, so an inch down in the tail translates to a noticeable lift in the front. My pin weight was well below the max for the truck and verified on a CAT scale.
Solution: off came the Timbrens and on went new Air Lift 5000 Ultimates. These add internal jounce stops, giving you the jounce reduction of Timbrens and the leveling capabilities of Air Lifts. I haven't tried them under load yet, but I don't see what could possibly not be great about this product. Obviously, I'll update this thread after putting the rig under load.
If you are looking for jounce reduction, the Timbrens do a good job. HOWEVER, while towing my Bighorn 3010 RE, the tail end of the truck dipped down about an inch, which was enough to throw the headlights off - it was literally difficult to see on country roads at night and I kept getting bright light flashes from on-coming traffic. I have a Crew Cab and long bed with a 172" WB, so an inch down in the tail translates to a noticeable lift in the front. My pin weight was well below the max for the truck and verified on a CAT scale.
Solution: off came the Timbrens and on went new Air Lift 5000 Ultimates. These add internal jounce stops, giving you the jounce reduction of Timbrens and the leveling capabilities of Air Lifts. I haven't tried them under load yet, but I don't see what could possibly not be great about this product. Obviously, I'll update this thread after putting the rig under load.