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B06A=3.909
B06B=4.875


That cant be right, no offense. The # code designates the ratio, for 06 to be 2 different ratios would be incorrect.

Here's a more accurate list, also 4.30 is a lot more common than you may think, same goes for the 3.58.
These are the most common if not all of the ratios that appear in Tacoma Prerunners and 4x4's.
02 = 3.58
03 = 4.10
04 = 4.56
06 = 3.91
07 = 4.30

Sorry, I disagree: the dealer documentation is quite specific. The 06 by itself does not guarantee the ratio. The combination with the pinion (spider) count and the numeric code was very specific in the Toyota list, and came out to different ratios.

-Bill
'87 4Runner w/ '96 5VZ-FE, 'Red Chili II'
'97 Taco XtraCab 3RZ-FE, 'BlackBean'
TLCA # 13257, Rising Sun 4x4 Club Land Use Coordinator
"He who stops being better stops being good." -Oliver Cromwell