Using shims or deflecting discs in automotive dampers is the norm. There is a tremendous amount of work done to be sure the valve stacks meet the OE durability cycles. Sometimes the components are tested individually to 2x lifespan as stated in the OE's durability requirements.
The Bilstein...
A few things to be warry of with a spring seat spacer kit for those with Bilstein dampers:
1 - With the stock Bilstein dampers, there is ~1.9" of FA damper travel and and ~3" of rear damper travel from curb height before ESCV engagement in the rebound direction. On the front damper, you will be...
I've resisted replying to this...
There is no way these dampers are able to maintain the stock travels...the rear of the Bronco is a very tight package for the given damper stroke...in order to package a rod down coilover a remote or piggy back reservoir is required...
Even the rear King's...
The factory lower mount hardware is 14mm. They are also grade 10.9.
The front lower on this install is going to get loose pretty quickly AND the lower control arm holes will get ovalized...
OP - do yourself a favor and get M14 hardware.
The way I read Kings info is in damper travel...the result being a .25" reduction in travel in FA and a full inch of reduction in travel for the rear...
I do...here are the extended, compressed, curb (ride height) and ESCV engagement lengths
FA mm
FA Inch
RA mm
RA Inch
Comp (metal)
418
16.5
416
16.4
Comp escv
457
18.0
484
19.1
Curb
512
20.2
544
21.4
Reb escv
558
22.0
624
24.6
Ext
579
22.8
655
25.8
Ride height is not centered in...
I gave this data in another thread earlier today but I know stuff can get spread out pretty fast...
FA - full stroke (metal to metal) 161mm or 6.3"
RA - full stroke (metal to metal) 239mm or 9.4"
Hi Bronco people. I can provide a few answers to some of the questions out there for damper travel and spring rate.
Damper travels for 2 door and 4 door are the same. Damper travel is not equal to wheel travel...I do not recall the motion ratio for Bronco but it wouldn't be that hard to back...