All automatic 3rd gens with 3.5L are 3.909?

All automatic 3rd gen Tacomas with a 3.5L have 3.909 differential gears right?

 

Yes.

 

Some 2016/2017 SR/SR5/Sport came with gen 2 3.73 diff.

 

ATs, Yes.

MTs, all 3.5s have 4.30s.

 

Wow, I did not know this. I will reach out to Hollander to make sure they are aware as they do not list an interchange for a 3.73 in the 2016 or newer Tacomas. Do you have any documentation from Toyota I can send them by chance?

 

VIN sticker.
Here is VIN of wrecked 2015
https://stat.vin/cars/5TFLU4EN6FX112945
Axle Code A04A

Here is the image of my VIN - axle code A04A

 

I don’t think the axle codes mean anything. Parts sites and the FSM and the Tacoma product info sheets all show only 4.30 and 3.91 for all 3rd gens.

 

That's wild! Isn't A04A a 4.30?? The 2015 was a stick and yours is an auto.

 

2nd gen V6 manuals are 3.73. 3rd gen V6 manual are 4.30.

 

More good information on this thread.

https://www.tacomaworld.com/threads/which-models-have-which-size-differential.388610/

 

I'm here for psa. Make your own conclusions

 

Yea, historically Toyota axle codes are all over the place. Do not rely on them if you need to be 100% certain

 

Here is prerunner with auto
https://www.fontanamotorsdirect.com/pre-owned-cars/detail/2014-Toyota-Tacoma/1201560

Here us 2nd gen thread on ratio's
https://www.tacomaworld.com/threads/help-iding-my-axle-diff-and-gear-ratio.465148/

 

So have you actually counted your drive shaft rotations compared to your tire rotations? I would be willing to bet you have a 3.909 gear ratio if you haven't. If you have, that is very scary.

 

I did. Rotation test suggest 3.73. 3.9 will be close to 4 rotations. Mine was at ~ 3.75 rotations

 

Crazy. Hopefully you never need insurance to replace a front or rear end...you will grenade a T-Case or diff as they will put a 3.909 in there based off the VIN.