Part i The Research I will be rebuilding my TH350 myself, as a first timer! I of course will document, and photograph the entire process and hopefully it will make for good informative reading in the end. With your help, let the 'build' begin; I am hoping to install a valve body with compression braking. However I need to clarify some of the terminology with you guys first. I am looking to be able to put the transmission into a low gear and have the tranny limit my speed on a downhill just like a manual tranny would. TCI uses the term "engine breaking" in relation to an available valve body for the 700r4, while I don't believe this is literally engine breaking, I believe it is the effect I want. Can anyone confirm this? The part number for the 700r4 is 376015 http://www.tciauto.com B&M has a "Transpak" kit, the description includes, "downshift at any speed and hold...for heavy loads downhill..." there is a stage 1 or 2 kit available. This is part number 30228. Is this going to give me the desired effect? http://www.bmracing.com/index.php?id=products&sid=2&cat=13 Art Carr's full manual has compression braking in all gears http://artcarr.com/catalog.pdf sorry no direct link. While there has in the past been some doubt as to whether such a valve body exists, I know it does as I remember a member posting he had one Jequist? That said I don't recall what company it was so any leads would be appreciated.