new valve body, transgo shift kit, find an aftermarket Forward/direct drum, give it an external filter and a good external cooler (maybe stick a fan on it, too) and a trans temp gauge. Might want to have a Tech check the chain for slack. Otherwise, not much to do. the gearing is less aggressive than the MTX, (3.82 vs 4.06 FD, the individual gear ratios are fatter too), so that'll get you better MPG. that's about it. we don't have aftermarket diffs for the ATX, no aftermarket torque converter, nothing. the valve body, filter, cooler, and forward/direct drum are known weak points in these, with deficiencies from the factory.
I've been in your position before, and I can't say I was happy with the answer everyone gave me, but after having been through it I have to agree with forum wisdom. the road to performance modifications on this car starts with an MTX; if not, you're severely hampered in your efforts. Sorry mate.
Automatic TransaXle. It's rather a proprietary term. The manual transaxle is called the MTX-75, so it's always been referred to as an "MTX" around here - so that kind of spilled over to calling the automatic an "ATX".
And they usually choke on their own vomit at about 135,000 miles, so if yours is that age or older, you're experiencing a miracle.
Depends on what you consider hard and how far down the rabbit hole you go of "As long as I'm in there I might as well..."
Assume your'e going to drop the entire front end off the car and put it back together again.
There actually is a great donor for a project like this for sale in the for sale section right now.
Its probably more expensive than you would hope for but its a real treasure trove of great parts and you would end up with a very nice car when your done.
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