Join tis forum. It is a great site and there are Many who will provide all sorts of asistance with the 460/E40D which is what you have.
There is a thread on the E40D/4R100 trans fluid change process for the DIYer. It is veruy thorough and I followed it and it worked gra=eat. If your torque converter has a drain plug, even better. I chnaged outr my OEM trans pan to a 4X4 trans pan which had a drain plug. With the TC and trans pans now having drain plugs, the trans service is a breeze!
E40Ds are know to have the trans filter slip off and cause issues. There is a thread on thiws also with info on where to purchase the trans filter clips to prevent this from happening.
If you plan on keeping your RV and want to service the trans yourself, look into the TC drain plug, 4X4 trans pan, and trans temp gauge......it is well worth the effort and cost not to mention the simplicity in servicing.
Also, you should install a trans temp gauge with sender in trans test port. I found that my trans was running very hot (225+) for two two reasons...
1. Radiator trans cooler portion was blocking flow of trans fluid
2. A trans cooler was needed for the temps I was running in (ambient 90-110)
I added the TruCool Max trans cooler and a new radiator
My trans temps went down to 150-185 in ambient temps of 90-110.
These were the BEST upgrades I did to my 460/E40D
2023 GMC, 3500HD, Crew Cab, 6.6L Gas/6 Speed Auto, 4X4, Standard Bed; SRW
2011 Outback 250RS - Anniversary Edition
Equal-i-zer 10K