My 2-3 shift was hitting hard under light to no throttle for a few months before it just went out completely. I'm assuming the front pump went out. Clutch pack debris everywhere. Still shifted into R/N/D/1/2 - but wouldn't shift into 3rd, so couldn't go faster than 30mph or so. Original transmission had 168k miles. Beware - picture heavy post.
Anyways - after some research on 545RFE transmissions, I found a 545RFE in a 2WD 2009 Ram 4.7 V8 w/ 35k miles locally.
Both next to each other.
Both torque converters
OEM Euro
4.7 V8
Swap the tail/4x4 adapters
New Transmission cleaned up
Transfer case adapter plate all cleaned up
Both transmissions next to each other without the rear half
Had to use the skid loader w/ forks/chains to lift the trans back onto the high-lift jack. Not terribly fun with only one person.
PML deep pan cleaned up ready to go back in. New filters in the transmission before replacing.
All back together again. 15 quarts fill w/ a drained torque converter and deep pan.
The brackets on the side for the shift linkage need to be swapped over, both the one that holds the linkage, and the other that is on the splined shaft on the side that actually moves the gears around. The Ram splined shaft bracket is off by about 1 1/2 tooth. Once swapped both over to the new transmission everything will work correctly.
I did a test drive around the neighborhood and got up to around 60mph and all gears shifted great. Once I got back I used my Autel Maxidas DS708 from harbor freight and cleared all old codes and put the transmission into learn mode to reset everything. So far, so good. No shudder with new torque converter. Wouldn't expect any since the 4.7 V8 is rated at 310hp @ 5,650RPM and 330 lb.-ft. @ 3,950RPM.
finally got my 
if only I knew about this swap earlier it would have saved me a bundle and got her done so long ago. Thanks for pointing me this way.
