I suggest taking a peek at www.car-part.com
for a low-mile used 4.10 axle in your area. Newer 4cyl x-cabs and 4cyl reg cab autos have the same 7.5" rear axle you've got now, but with 4.10's. If you get an 8.8", which are more common as they're stock on 4x4's and most are 4.10, you'll be making a nice rear brake upgrade too...from 9" drums to 10" drums and people say it's a good performance upgrade. Limited Slip (LS) would be a nice upgrade too for those Northeast winters....and quite a bit of 8.8 4.10 axle are LS.
With the $330 plus labor, you'll be up and over $500 total out of pocket very easily. Low mile used axles can be priced from 100-300. I got my 30k used axle for 150.
Good luck with whatever you do choose to do. I hope I'm not coming off as though I'm preaching to you....that's not my intention. I'm just giving you other options to consider....I like the phrase "is the juice worth the squeeze". It's alot of what my logic was when building my truck. The way I look at it, if I'm going in to do work, I might as well see what my other options are to make the truck even better.