mackattack2 Posted May 22, 2007 Share Posted May 22, 2007 HiI'm new here and new to macks, but not new to truck restorations. It has been a hobby of mine for years. Recently I purchased my first Mack truck. It's a mack LJT sedan cab fire truck. I would like to upgrade the engine and trans to something more up-to-date and dependable. As for the engine it has now, a big 707 cu in gas engine, I think it's too far gone to try to do anything with. The truck's been sitting in a field with no spark plugs and the manifolds and starter in the back of the truck for 16 years. This brings me to my question. What engine/transmission combinations do you recommend? I do eventually intend to drive this truck, not just to local parades but cross-country too. I would like to upgrade the engine/transmission to a later mechanical diesel drivetrain. My first priority is dependability. I want an engine that wil last hundreds of thousands of miles between rebuilds. My second is economy. I'm not looking for the biggest engine I can stuff under the hood, but something very economical I can drive on a regular basis. Someone told me (a non-mack person) I should consider a cummins 5.9 as they are used in everything from Dodge 1 ton trucks to school buses to Ford F800's. But I've still got a lot more research to do before I decide on anything. What are your engine/transmission combination suggestions? For a transmission I want a manual, with really low low gears and very high overdrive with lots of powerband overlap so there is no possibility of lugging the engine between shifts. From what I've read, I don't want a twin-stick trans, but I do want at least 6 speeds or more. What are your suggestions and opinions on what I should be looking into? I won't be racing to any fires, but I might be occasionally pulling an airstream trailer. And if you have any suggestions on where I can purchase parts manuals and shop manuals for this old truck, it would be appreciated.Thank you.Steve Quote Link to comment Share on other sites More sharing options...
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.