mjd325is

Thank you for the replies. Great conversation.

Regarding the differences in engines & transmissions, one with 300HP Econodyne 5 speed, and the other 237HP Maxidyne 5 speed... what are the differences? From what I've read... Econodyne's torque curve is not as flat as Maxidyne. But if they both have 5 speeds, both must be sufficient to pull through the gears effectively. What’s the consensus on this?

Matt

Hi Everyone,

I'm a noob. This site has been great to read and learn about Macks that I've always been drawn to. I feel like I'm getting addicted with all this info in one place. Same thing happened to me on the vintage Onan generator section on Smokstak (highly recommended).

I'm looking for a 6 wheel dump to putt around with and tinker on. I've been looking at 1980s R models, DM's, and now I found this U model on craigslist. I just wanted some of your thoughts on what to look for when considering buying one of these trucks. Here are a couple I'm planning on taking a look at locally:

U686 5 speed with 300HP Econodyne. Is Maxidyne a better engine? http://nh.craigslist.org/cto/5042356581.html

R600 5 speed w/ Maxidyne 237, price seems right http://nh.craigslist.org/hvo/5060256076.html

Any thoughts on these trucks or experiances you've had with similar model trucks? - good or bad. I'm just looking for a place to get started.

-Matt