06 Toyota Tacoma prerunner rear end/ diff ratio need help

i want to start this off by saying im not a car mechanic guy. i have a 2006 toyota tacoma prerunner 4x2 no dif lock. there was a whine that follows the rpm and i took it to a shop and they said i need a new rear end. my truck is completely stock and i called toyota dealership they said i have a 4.10 ratio. i call the salvage yard and they said i had a 3.73 ratio . so now im lost is there a way to find it on the carrier assembly? also does ratio make that big of a difference cause i seen some 3.58 that were cheaper. thanks for any help

 

AFAIK all 4.0 V6 Tacomas come with 3.73

 

I believe you are correct but isn't that just for automatics? I thought the manuals had 4.10's

 

Pretty sure the the gear ratio is the same for both.
The Automatic actually has a higher over all OD.
So it would benefit more from a LOWER gear. (As in 4.10)

Any ways. No to confuse OP. I am about 99% sure they are 3.73 for both transmission with the 4.0

 

I just searched it quick and I was wrong... The 6lugs with I4's have 4.10s where all V6 6lugs have 3.73s

 

Actually I need to correct myself. (Before someone else does)
The XRunner got a totally different gear ratio. But that doesn’t apply to OP

 

To be sure, you could decode it with the door sticker.
And I can’t figure out why the dealership didn’t do it for you?

Look at the door sticker on the divers side. Open the door it’s on the jamb.
It looks like this.

The go here to decode it https://www.tacomaworld.com/threads/2005-2016-tacoma-axle-codes.408019/

 

thank you guys i learned alot in the few mins and fast response .
@TnShooter thanks for that link it made it quick and easy and was right about 3.73 .
the dealer was way off on the 4.10.
now the salvage yard can rob me they want 1.3k but it will all work out.