Hi!
Here is a link to Wikipedia about the largest Volvo FH 12 -16 and Volvos Jake brake called Volvo Engine Brake with pictures on this brake mounted in the motor how it works, what as happen when it is working, new developments on trucks. It is all on English but not about VHD or VHN 680 but both trucks chare parts if I not am wrong. Dashboards are one I think.
For you as not have a total grip of VED is this page good and it covers pictures and about is written about Volvo compound (VC) and much more. I guess the Volvo truck as you run use I-shift and transmission as we have here. Synergy advantage is what AB Volvo must strive after when they bought White, Renault and Mack. It should be very bad economical thinking if every brand should develop every part themselves. It has a pail between 1993 almost 2012 and you will find a lot of links.
http://en.wikipedia.org/wiki/Volvo_FH
Take care
Lars-Gunnar![]()