Adding so little to the length of the strut would have minimal effect on the issues described. As additional length is added to the strut, thus increasing the length of travel, alignment geometry and UCA issues occur. With just the spring pre-load, length of travel and overall suspension design geometry stay the same, your just reducing the distance to the lower travel limit.
Bilstein 4600's are great for town/highway and light offroad. For stock ride heights. Have had them on two different trucks, always very happy with them. Bilstein 5100's, slight improvement over the 4600's and shock length availability Front shock allows height adjustment from stock to 1.85 inches. Rear shocks available in different lengths from stock to raised trucks. Bilstein 5160's adds remote reservoir to 5100's rear shocks Bilstein 6112's, much heavier duty front stocks that come with their own springs cause of increased shock body size. Allows height adjustment from stock to 1.85 inches.
It's simple geometry. When you add a spacer to the bottom or top of the shock/strut mounting points to raise the vehicle, you have increase the overall length of the shock/spring strut assembly by having added those blocks to either end. This increases the suspension travel drop allowed, along with changing the strut travel geometry, in which the stock upper control arm is effected by the most, along with your available wheel alignment. The 5100/6112's front shocks raise the ride height by increasing the compression on the spring by preloading the spring to gain the increased ride height. The overall length of the shock/spring strut assembly stays the same, therefore the designed suspension components geometry ratio has not changed and wheel alignment can be adjusted to compensate for the limited height increase allowed by the shock/spring preload. Available shock travel and overall suspension travel has not been changed by the Bilstein setup, but there will be a very slight increase in ride harshness because you are in effect putting in a stiffer spring as you increase that spring compression height adjustment. This is so small that it probably will go unnoticed by most truck owners. I hope this helps with everyone's understanding on this debated question.
Have had Bilstein's on many vehicle's for over 25 years and have never been disappointed. Just put a set of 5160's on the rear of my 2018 Sierra 1500 with NHT and what a huge difference. Eliminated most all of the pogoing/bouncy ride without any harshness. Was very surprised that the rears alone made such a huge difference. Will be installing 6112's on the front shortly Yes, they are very big shocks, looks like front driveshaft clearance will be tighter.
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