Rear shocks…., Sorry if covered 100’s of times Options

[Freezin 914]

Recently assembled new rear shocks, Bilsteins.

100# springs, new rubber parts, stock and new lower perches.

I assembled them without springs compressed, and tightened the factory nut assembly (#10 PET) until tight. I believe it is threaded on all the way. Then temporarily slid new rubber bits over the top……my questions are:

My donor shocks had some plastic washers under the hats, do I reuse them?

Do I need any jounce rubber pieces? (Have never seen them used on any of the cars I have parted, or worked on)

Last question, the new nylock nut doesn’t look like it will catch the nylon? Should I use the top nuts I removed from old shocks? I assume the nylon lock nuts would be preferred.

[bkrantz]

Off the top of my head, I think the Bilsteins have inner bounce stops.

[Superhawk996]

Off the top of my head, I think the Bilsteins have inner bounce stops.

Bilstein yellow sport rear dampers are a monotube design and the “jounce bumper” is inside the tube.

Monotube dampers are a little bit different because they have a floating gas piston inside the damper body that contains the high pressure gas. I could be mistaken but I believe the rear dampers don’t have a conventional rubber jounce bumper inside but when the piston and oil flow nears full compression travel, the pressure in the floating piston getting compressed further and further acts like jounce bumper as its gas pressure increases - preventing a hard crash of the piston into damper tube at its end of travel.

(Edit addition). I’m now confused myself. I went digging in the Bilstein catalog for p/n 24-001793 to get you a solid reference and it references an internal rebound stop but says nothing about a jounce bumper stop. I can tell you when I assembled mine I didn’t use an external jounce bumper but now I’m doubting myself (IMG:style_emoticons/default/unsure.gif)

Install instructions don’t clarify.

I may have to call Bilstein to see what they say.