Holy $#!&, you mean we might actually have a statistically significant dataset here!?!?!?!?! In all my years of internet technical discussions, I have never seen that. Next thing you know I am going to hit a bigfoot on my way home from work tonight...

 

A03A for me too, and a little under powered by a 2C diesel engine

 

hey so I have a 2000 toyota 4runner sr5 4x4 automatic with abs but without diff locker and my rear axle housing appears to have e rusted through and I didnt notice and then the other day I was driving on the interstate and loud whining and horrible smell was coming from my rear axle A03A is my code but toyota said it could be a 3.90 gear ratio or a 4.10 how do I know for sure

 

Its 4:10 ratio, Do the spin test, it is also stamped on the ring gear, Toyota dealerships (shop with rights to sell toyota's) never know those numbers, it is one or the other, but they should be able to contact Toyota headquarters with the VIN and axle code and replace the 3rd member with that number and the correct ratio. Where are you located, you can get one from ECGS and exchange your unit, give them the VIN and axle code in an email and order through East Coast Gear Supply and have them confirm your axle ratio and order. Sounds like it might be wise to get a complete axle housing and 3rd member from the wrecker.

https://eastcoastgearsupply.com/i-15...-8-v6-3rd.html

 

That is 4.10 for sure, go by the axle codes I posted above.

The spin test is always a good idea if you think your axle has been modified