Penske
Penske 7500 dampers are due for a rebuild.
While the manual give enough information to allow for disassembly and reassembly, IMO there is a difference between "able do it" and "wise to do it".
Have a shock dyno handy to check your work ? Even if I'm getting a simple rebuild, I want dyno graphs after completion. Re-valve ? Even more important.
Have Penske's on two of the race fleet (the Red Sled and Le Plastique Pig), and while Der Professor is mechanically handy (build the race engine that is still competitive and has over 150 race hours for the Mazda Spud), I leave shock stuff to Mr. Stimola, the Penske shock god.
Joe Stimola
SRP Engineering
(516) 978-0092
http://www.srpengineering.com/services.php
Shop manual for the shocks was available from
http://www.shock-shop.com/Penske/PDF%27s/7000%20Series%20Manual.pdf