Just finished replacing my rear main seal. The tranny, flex plate, torque converter all lined up and bolts were easy to thread in, but with the bottom access plate off, engine running, there is a slight fore/aft wobble visible in the TQ and flex plate, maybe 3/16 inch or so as viewed from the side. There is no leaking or vibrations at speed, just wondering if these things spin perfectly true or if they normally wobble a bit. It's not like it seems out of round, the TQ "nub" is seated in the flexplate, or so I imagine since you can't see up in there. I had no issues getting the bolts in, so I assume alignment is correct. I never thought to look at that before tearing it apart. Maybe I should just slightly loosen those bolts and mess around with the flexplate/TQ alignment or just accept it. At least I'm not leaving a half cup of oil everywhere I park now!

 

Explain better!

You said fore and aft movement. Do you mean the converter is moving in and out of the trans pump????

If it is check your crankshaft end play.

 

It has a slight wobble as it spins, not actually moving fore/aft on the tranny input shaft. Kind of like it is slightly off axis, like when a spinning top just starts to lose its balance. It is not a major wobble, just enough to notice. I will just crack loose the flexplate/converter bolts and play around with it. I thought maybe it was common to see. If not normal, I expect the little nub on the converter might be binding in the flexplate center hole, causing it to sit slightly cocked. The tranny was bolted up tight before I inserted the converter bolts, so the nub had to be at least started in the flexplate hole. At this point I could still rotate the converter by hand to line up the holes with the flexplate. Obv. I could only insert 1 bolt at a time through the access hole, and as such, maybe the first one or two could have pulled the converter a bit diagonal causing a bind where the nub fits into the flexplate. I put in all bolts finger tight, and after all were in, I tightened them one by one. The converter was tight coming out, though I cleaned and sanded the mating surfaces. If that nub can't completely seat in the flexplate, as those bolts are tightened, instead of the converter being pulled up tight and flat to the plate, the flexplate is pulled/flexed towards the converter, thus the wobble.
Or it might just be normal...I feel like I spent a good amount of time checking alignment and making sure as I slowly tightened the bellhousing bolts, that the converter was able to spin freely, and not just being pushed up against the flexplate without the nub finding its hole.

 

Well, not to be a edit they don't call it a flexplate for nothing. LOL Sorry, that was uncalled for.. Could it be your just seeing the weights and thinking it moving? Almost every one i've ever watched running looked like it wobbled some. It is usually the weights making it look like it is

 

At least yours is not slamming into the front pump & then welding the seal to it & pulling it out of the pump this the problem I'm trying to resolve

 

Yup, I am lucky. I just drove it 100 miles, highway speeds, no issues, no leaks, no vibrations. Case dismissed.
I am sometimes too **** for my own good. Seems the flex plate is there doing it's job.

 

Good deal.......

 

The touque converter is supported in the front by the pilot into the crank and in the rear by a bushing in the tranny front pump housing. The flexplate only transmits rotational torque.The wobble is due to manufacturing tolerences. The flexplate is thin and "flexable" to compensate for the out of true torque converter housing. It doesn't really flex as the engine rotates.
It was probably wobbeling before but you just didn't notice it. The bushing in the pump would have to be totally gone to allow much wobble.

 

That's pretty much the deduction I had arrived at, thanks for backing it up!