The trans is definitely done. The reverse ports probably aren't worn as badly as the forward ports. This is why it likes reverse a bit more than forward, but the trans is still needing replaced/rebuilt. I can tell you it is a tedious job unless you pay someone to do it. Depending on the shop, they may not touch it because you're putting more in it than the tractor is worth, and they can get burned if you decide to abandon the machine. Not saying you'll do this! Just telling you what their mindset may be because they deal with this possibility every day. This is where the repair vs replace decision comes in play. Of course, you need to factor in the current economy and your budget as well. A direct replacement machine is the S180(2yr warranty), which will retail for $3599 in 2023. That is a 23hp machine with 54" deck. Compare that against the dealer exclusive model of X380(4yr warranty) with 54" deck which will retail for $5799 in 2023. The S180 is built on that 5-7 year lifespan, but will probably last 10 years if maintained and not used on hills. The X380 will last at minimum twice as long in the same conditions. IF you have hills, then we're looking at the X570(4yr warranty), which has a transmission designed for that landscape, and it will retail for $8099 in 2023, and it is a 20 year machine as well. Deere currently has 0% for 9 months or 1.9%/48 months financing available. Here are the facts, now it's up to you to decide which best fits your needs. Good luck!