I have a 1993 (Japanese-made) 2WD T100 with a 3VZ-E and an R150. It has a JTxxxx.... VIN. The axle code on the doorjamb is A01A. According to the chart on http://www.off-road.com/toyota/tech/other/4_axles.html , the axle in my T100 is a 138mm ring gear differential with 3.300:1 gears.


Visually, the axle is a Toyota "8.25 / 8.4" axle, noted by the gussets on the third member and the square gusset on top.

It's a 6 lug axle, with the classic trussed axle housing, shown here:




Anyone know why there would be a disparity like this?

its a 7.5 inch ring gear,    ratio is a 3.42 

with a 3VZ-E

First post says it's got a 3.0L V6.

One of the main reasons I'm curious is that I can't find ANY source that says there's an axle other than the 8" ring gear mistakenly referred to as the 8.25 or 8.4 in T100's.

Every source says that is the ONLY axle offered in a T100.

Also the speedometer reads roughly 10-11% off: read "It reads 67 MPH when GPS says 60 MPH"

To truly go 70MPH on the highway (going off GPS, those "Your speed is____" readouts and counting mile markers) I have to turn 3750 RPM.

The truck has 215/75R15 tires.

Can anybody make a positive visual ID on my axle (going off the gussets, etc)?

I really just want to know the gear ratio, because with the current gearing and 215/75R15's, it's top speed is about 75mph at 4000RPM - and holding a 3VZE at 4000 RPM for a few hours feels bad.

Thanks - PM sent.

Thanks for all the info!

so is it an 8" ring gear?

I am the second owner - I bought the truck in April of 2005. I reckon the prev owner had it from 1993 until 2005.

Don't know what work was done to it - it's just an old beat up work truck- doesn't appear anyone cared too much about it.

So I'm still unclear - Is this an 8" ring with 4.10's OR a 75" ring with 3.58's?

I think I have the diff described below:

Erik from 4x4Wire says:
"All 2wd and 4wd T100's, Tundra's, and  Sequoia's use a newer/stronger 8" 2-pinion diff. Tacoma 4x4's and Tacoma PreRunner's that don't come with the electric locker, as well as V6 Tacoma 4x2's also came with this diff. One easy way to identify it is by the larger mounting hardware (10mm studs w/ 14mm nuts) vs. the smaller stuff on the older diffs (8mm w/ 12mm nuts). It also has a different shaped diff cover. and a slightly larger diameter bolt pattern and flange (about 1/4" larger) than the 8"  4cyl or  V6  diffs. It has a large one-piece carrier bearing cap (or "truss") that bridges over the ring gear to add strength. The axles that fit into these diffs are the same size as the earlier 8" diffs (30 spline).
In the past this diff has also been mistakenly called an 8.4" or 8.25" diff. The ring gear actually measures 8", but it is not compatible with the older 8" diffs at all. The extra strength of this diff comes from the bearing cap/truss and large diameter pinion gear shaft."

Dang, this really is a mystery then!

Crazy Yota's!

With Jeeps there's only 2 engines and 3 axles 

according to Toyota it's a '93 OR the prev. owner blew a rearend and since the bolt pattern is the same they may have replaced it with a boneyard one.  ??