Yup, there's a transmission shop a buddy and I go to that do the work for $400 -we provide hardened 4th gear hub, filter and fluid.... shift solenoids if we want.
Comes out to be a ~$525 (without solenoids), which is $100 more than just labor on swapping the trans out at the cheapest shop around.... transmission, fluids, seals, filter, etc... are on top of that..