I just picked up a 400 myself. For all intents and purposes, it's a Super MTA with different sheetmetal. As stated below, torque amplifiers when properly adjusted and maintained have one h*lluva long service life even in tillage situations. Don't be afraid to pick up an owners manual to familiarize yourself with how and when to operate the T/A. The 400 is a pretty powerful tractor for it's size and still relatively simple to work on. Parts are readily available both OEM and aftermarket, so that simplifies the situation. You really need to ask yourself what you plan to do with the tractor as that will dictate weather or not you tear into the T/A or not.
Shoot me an email if you have any questions. I've got a fair amount of pictures of mine in different stages of tear down that might help out.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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