Big job. The TA is in the center section of the tractor, part engine bolts to. You have to double split the tractor, first engine to clutch housing than clutch center housing from rear end. I think this can be done with out removing the cab on the 3688. Then its just a matter of disassembling the center section and replacing the TA unit. As for cost I would figure in the $2000 neighborhood depending on just what parts you find that need replacing. If you have a shop do it add another $1500+ for labor. But before you condem the TA you need to do some checks. The TA is activated by a switch and solinoid in that tractor that can be out of adjustment or faulty. You can use the tractor as is with the TA out and do no harm, you just don't have the extra gears. Good Luck.
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