The only thing about doing the gears in the TC will essentially give you 4.56 gears so if you are driving with 35 or larger you won't get the full power back.
If you do the math the 4.88 is essentially 19% more then what you would have with the factory ratio. If you are currently running factory size tires and wanting to upgrade to say 37's that is a 21% increase in tire size over-stock.
This graph is from Tacoma Tire Calculator running 37's they say 4.88 would put you back to stock, but if you want increased power go with 5.29.
The top row is gear ratios and the bottom line is your RPM @ 65 MPH.
| 2.35 | 2.73 | 2.94 | 3.07 | 3.21 | 3.31 | 3.42 | 3.55 | 3.73 | 3.91 | 4.11 | 4.27 | 4.56 | 4.88 | 5.13 | 5.29 | 5.38 | 5.71 | 6.17 | 7.17 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1386 | 1610 | 1734 | 1811 | 1893 | 1952 | 2017 | 2094 | 2200 | 2306 | 2424 | 2518 | 2689 | 2878 | 3026 | 3120 | 3173 | 3368 | 3639 | 4229 |