rear end ratio or other issues?

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Ive got an 87 silverado 4x4 i bought as a daily driver 4 years ago. I know in stock form these are low hp trucks, but since the day ive bought it ive had an issue i think is more than a power issue.
It has 33" tires with what i assume are the stock gears. 3.08? I cant find a definitive answer?
If someone is driving 65 in 70 and i pass them i need a looooonnnggg clear path to get up to speed. Its almost comical and annoying to other drives when they think im just riding beside them in wrong lane. When towing a 16 foot open empty trailer or 10 foot enclosed empty trailer i cannot go over 50 mph with the gas pedal on the floor. I dont tow a trailer alot 3 or 4 times a year. The transmission went out last week and is being replaced. Ive not trusted the transmission since i bought it due to the color of the fluid. I had hoped the transmission might be the issue but the mechanic doesn't think so.
Would the stock gears be my issue? Or is there something else? Or am i at the limitations of the truck? If gears what is recommended for 33" tires? Daily driver, hunting truck, dont play in the mud much just when hunting. Any help would be appreciated. Thanks Ryan