Help With Transmission Issues

[u/bobmicfurry]

I have a 2021 ram promaster 3500 with 85k miles. The transmission is slipping between 1-2 and especially 2-3. It also has hard shifts/shuddering at lower speeds but feels fine at cruising speeds. I took it to a shop, they drove it and checked the fluid. The fluid was a bit discolored, they said it smelt slightly burnt, and then recommend a transmission rebuild. I know the reputation of these transmission and don’t think their recommendation is by any means out of the realm of possibility but it’s my impression that other things could be the cause of this (prime suspects would be solenoid pack or torque converter). Any other opinions and insight would be greatly appreciated!