I wish you the best of luck with the 48re, my 05 CR/48re conversion has towed and pushed hard 30,000 miles and yesterday, 45 mph on a slight grade empty truck , POP and coast to a stop,the $700 for billet input shaft was as waste , the $1500 Gorend converter in going to require $$$ and probably stator and pump.
The 48re has been the Worst part of my conversion, it has never downshifted well with Smarty power , and the #3-4 shift with the triple lock has been violent at times untill I came up with an adjustable time delay relay for the converter.
Short of it is I wished a 1000 times I'd put a 6 speed or Alision in it and it may happen now depending on the price on the repair.
Most likely your wife wont be nearly as hard on it as I have been but I built it to Tow which it has done well but the price tag for the miles used is going to hurt.