The axle code on a 94 T100 that I recently picked up is A05A, I counted rotations of my driveshaft/wheel and it is 4.71- the 94s seem to be the only year that had this ratio from what I have read.
Has anyone else confirmed. their 94 with same gear code?

 

According to www.car-part.com, here's what they show fer 1994 rear axle ratios:

4 cyl, 3.62 ratio
4 cyl, 3.77 ratio
6 cyl, 4x2, 1 ton, ABS, 4.455 ratio
6 cyl, 4x2, 1 ton, ABS, 4.70 ratio
6 cyl, 4x2, 1 ton, w/o ABS; 4.455 ratio
6 cyl, 4x2, 1 ton, w/o ABS; 4.70 ratio
6 cyl, 4x2, 1/2 ton, ABS, 4.08 ratio (MT)
6 cyl, 4x2, 1/2 ton, ABS, 4.27 ratio (AT)
6 cyl, 4x2, 1/2 ton, w/o ABS; 4.08 ratio (MT)
6 cyl, 4x2, 1/2 ton, w/o ABS; 4.27 ratio (AT)
6 cyl, 4x4, ABS, 4.455 ratio (MT)
6 cyl, 4x4, ABS, 4.70 ratio
6 cyl, 4x4, ABS, 4.90 ratio (AT)
6 cyl, 4x4, w/o ABS; 4.455 ratio (MT)
6 cyl, 4x4, w/o ABS; 4.70 ratio
6 cyl, 4x4, w/o ABS; 4.90 ratio (AT)

1993 had these ratios...
(6 cyl), 4x2, 1 ton, ABS, 4.455 ratio
(6 cyl), 4x2, 1 ton, ABS, 4.70 ratio
(6 cyl), 4x2, 1 ton, w/o ABS; 4.455 ratio
(6 cyl), 4x2, 1 ton, w/o ABS; 4.70 ratio
(6 cyl), 4x2, 1/2 ton, ABS, 4.08 ratio (MT)
(6 cyl), 4x2, 1/2 ton, ABS, 4.27 ratio (AT)
(6 cyl), 4x2, 1/2 ton, w/o ABS; 4.08 ratio (MT)
(6 cyl), 4x2, 1/2 ton, w/o ABS; 4.27 ratio (AT)
(6 cyl), 4x4, ABS, 4.455 ratio (MT)
(6 cyl), 4x4, ABS, 4.70 ratio
(6 cyl), 4x4, ABS, 4.90 ratio (AT)
(6 cyl), 4x4, w/o ABS; 4.455 ratio (MT)
(6 cyl), 4x4, w/o ABS; 4.70 ratio
(6 cyl), 4x4, w/o ABS; 4.90 ratio (AT)

 

Ok, so here.is what I got, I was wrong- A05A is 4.90 and A04A is 4.70

Here is a picture of the ring gear out of a 1994 T100 with A04A, it has the 4.7 ratio stamped on it