What Upgrades needed for a 3/4 ton pickup

rarin'2go wrote:
I want to thank everyone who responded to my other post "will a 3/4 do". It was very informative. I am making a new post because I thought I could get more answers than just asking on my other post. On to my question - I have a chance to get a chevy 2500 (used, late model, low miles) but it is not set up to tow a heavy 5th wheel with a towing package. What would I have to do to upgrade it to be able to safely tow my 14000 trailer? On the other hand I also have a chance to get an older GMC 2500 that already is beefed up with a trailer pkg and a snow plow setup but has higher miles already with a 5th wheel hitch.

Couple comments, you've already heard plenty about how "well" the drivetrain will lug a trailer that size.
To your statement above, I'm not aware of any downgrading in cooling or drivetrain parts that would show 1 3/4 ton truck not having a towing package, vs another. Yes maybe auxiliary in bed trailer plug or 5th wheel prep package or similar. But there is no distinction on tow ratings based on a tow package I'm aware of.
Gearing though is a real thing, as mentioned already also.

If you meant one has a 5ver hitch already and the other doesn't, well, just consider that part of the cost/benefit calc for each truck.