Probably a Turbo Hydro 400 in 3500, but maybe a 350.
700r4
Yes it will.
5w30 engine oil.
You did not say what the year of the 2500 was. Need to know.
4L60E or 4L80E depending on engine, 1500, 2500, or 3500.
The GMC Vandura 3500 with a 6.2L diesel engine typically comes equipped with a Turbo-Hydramatic 400 (TH400) automatic transmission. This three-speed transmission is known for its durability and performance, making it suitable for heavy-duty applications. In some configurations, it may also feature a manual transmission option, but the TH400 is the most common pairing with the 6.2L diesel engine.
The 2013 RAM 3500 has a V8 engine.
The 2014 RAM 3500 has a V8 engine.
That would be the 4L80E transmission.
The 2011 RAM 3500 has an inline 6 engine.
The 2012 RAM 3500 has an inline 6 engine.
3500 lbs-5000 i would install a transmission cooler