Transmission questions

[SAndreasen]

Is the 47re safe to tow with in overdrive? And I installed the new od lockout switch and it only works when I’m in park any ideas ?
1999 3500

 

[Road Dog]

I've always used O/D when loaded or towing. I focus more on RPM and exhaust temperatures. With 3.51 gears I'm always using the O/D ON-OFF switch and third gear lockup but on level roads and 90+ kph I'll be in fourth. These days I have a slide-in camper and tow an ATV trailer. That puts my GVW at 11K (max) and a trailer at around 2K lbs. There's a lot of mountains where I live (British Columbia).

 

[SAndreasen]

I have 4.10 gears with overdrive off 55 mph at 2200 rpm