Think I'd go for it...
3.73 is about a 10% increase in RPM (over 3.42). In "D"rive the transmission has a 1 to 1 gear ratio. Basically a straight shot through (This is why you tow in Drive) the transmission. There are many online gear ratio calculators. I think you'll lose about 1 mpg highway...
https://www.summitracing.com/expertadviceandnews/calcsandtools/gear-ratio-calculator
You want to solve for RPM.
This is off the top of my head - given you have a 4L65e...
3.73 is about a 10% increase in RPM (over 3.42). In "D"rive the transmission has a 1 to 1 gear ratio. Basically a straight shot through (This is why you tow in Drive) the transmission. There are many online gear ratio calculators. I think you'll lose about 1 mpg highway...
https://www.summitracing.com/expertadviceandnews/calcsandtools/gear-ratio-calculator
You want to solve for RPM.
This is off the top of my head - given you have a 4L65e...