I drove my runner daily for two months on 4.10s and an open front diff with 36x12.50s after my solid axle conversion.

You won't kill it. Really, it'll just be agonizingly slow (just picture your rig now, but with a stop behind the gas pedal preventing more than 3/4 throttle) and you'll only use 5th gear going downhill on the interstate with a 20MPH tail wind while drafting an 18 wheeler.

I then dropped in two 5.29 diffs with a pair of lockers all at once. Something no one tells you is how MINOR the gearing change is. Your shift points move closer to stock and you get 5th gear back... but it's not like you gained 20 HP and it crawls like a champ offroad. Heck, offroad it's barely noticeable. <img src="/forums/images/graemlins/lol.gif" alt="" />

[EDIT:] Forgot to mention that I recently discovered that my 4runner DIDNT have 4.10s stock. It was a 22RE with the 31" tire package, so it had 4.56s. It was marginal. I also think that that's why people brag on the huge improvement with 5.29s that I didn't really notice. <img src="/forums/images/graemlins/wink.gif" alt="" />

People don't mention it much, but if you had an auto factory you have 4.56s or 4.88 usually... 31" tire pacakge got 4.56s installed on a lot of 5-speed rigs on these forums that people probably don't even know they have. Like me, for instance. <img src="/forums/images/graemlins/notooth.gif" alt="" />