Hello, Gentlemen I just came upon your site,Its very good. I have an '81 R- modle that has been a working-work in progress for about 12 years. Originaly it was a Matlack tank lines unit ,,complete w/ 5spd ,3 leaf rear susp. 22'' datons , and those blessed wedge brakes. It had new York and new jersey highway stickers on it. I suppose it must have made the auction circuit to end up in Collins Ms. a friend of mine bought it ,and hauled gravel with it for about 6 years. Sufficed to say when he parked it was sad to say the least. the only think it had going for it was it had been refitted with an '87 cab and the motor was an '88 pedigree reman e-6 -300 2v . At this point the only thing that is original to the truck are the framerails and the title. I am planning an out out of frame major o-h for the end of the year when things slow down. I rolled a set of brgs in it in 01 and other than setting the valves occasionaly nothing has been done to it since it came to this part of the world in 1995, so its time. I'm aware that was a long prelude to a simple question ,but it seemed nesesary to give the back ground so you'd know this aint B-S . The ? is ......................... Does any you know of a Mack place similar to what the folks at Diesel Injection of Pittsburg do for the 855 cummins. I'm not looking for a 800 hp but while I'm there why not get a little extra . The old ''Mutt'' is by no means a slouch, she'll pull out 2600rpm grossin 80k w/ a 13spd fuller and 3.86 gears the big cats tip there hats when we pass. but what the heck. If somes good a lot must be better. thanks OUT.