i know this is a newb question but my dad was an engine mechanic and he doesnt know what the balance shaft is on this motor. i need new bearings all around and i cant figure out what the balance shaft is
the balance shaft goes right above the cam, in the lifter valley. It was mostly used on FWD 3.8's but also in some of the old carbed 3.8's and in the 97-current 4.2 trucks. It's just something that helps reduce vibration from the motor and widens the factory rotating assembly balancing tolerances. The 89-97 MN12 never came with one. Our engines have a freeze plug in place of the balance shaft hole.
youre getting yourself into a lot lol. The motor is run off of a different computer so you'll need the computer as well, and the transmission is different from your 96's, it's not electronically controlled. And it's length is also different so you'll need the driveshaft and transmission mount as well. I really think that would be a step in the wrong direction. I would try to keep the 4r70w tranny your car came with and try and look for a 94-95 SC computer or possibly the entire drivetrain for the swap.
I sincerely wish you luck, it is a huge project to take on. I'm not saying I doubt your ability, but I do know it is a lot of work to do a complete swap such as the one you speak of. It is surely possible, but there is a lot of work ahead of you. Good luck and let us know how it turns out.
A forum community dedicated to Ford Thunderbird, Mercury Cougar and Lincoln Mark owners and enthusiasts. Come join the discussion about performance, modifications, troubleshooting, maintenance, and more!