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Toyota Differential Identification

Time:2018-10-16 02:33Turbochargers information Click:

Toyota Differential Identifica

Differential Identification

Toyota has provided 4 differential types in pickups and 4Runners -- the 8" standard, the 7.5", the 8" V6/Turbo, and a new one in the Tacoma and third-generation (96+) 4Runners.

The most common is the 8" standard. It is used in the rear axle on '79-95 (96?) 4WD trucks and 4Runners, and 3/4 and 1 ton 2WD pickups, and it is also used in the front axle on 79-85 (solid beam) pickups and 4Runners.

The 8" V6/Turbo axle is found in some turbo and V6 models, and is a little beefier. It is a 4-pinion design, whereas the regular 8" is a 2-pinion design. Many V6's had 2-pinion cases too.

The 7.5" differential is used in the front of IFS trucks ('86 and later). It is also used as the rear differential on some 2WD trucks.

The 8-inch Toyota axles are strong and utilize a third-member setup, much like the 9-inch Ford. This means the 'guts' of the axle can be easily removed for servicing or gear and differential carrier changes. It also means that its easy and fairly cheap to buy and ship third members from differential specialists.

I don't know much yet about the Tacoma/96+ 4Runner differential. There is a factory option for a manually-operated locker. If you buy a new Tacoma or 4Runner, Get this option; it will improve your off-road ability tremendously.

Working on the Axles

Setting up ring and pinion gear clearances properly is said to be a difficult task best left to professionals. So if you want to change your gearing or your differential carrier, unless you really know what you're doing, consider taking it to a professional that specializes in such work. Most 4x4 shops set up diffs frequently. Figure $150-$200 per axle just for the labor. I've been quoted between $1000 and $1500 for a complete gear change (both axles, including parts, labor, gaskets, fluids, etc.).

Another option is to buy a third member that is already set up the way you want, and install the entire third member as a unit, which is much easier to do yourself than a full gear setup. NWOR and West Coast Differentials sell complete Toyota third members ("Starting at $325").

Otherwise, you can buy the gears and do it yourself.

Gearing

I could use some help here figuring which codes are common! Please take a moment to email me with your C/TR/A/TM code, engine type, transmission type, model year, stock tire size, and country of purchase of your truck, and I will update the table below. I'm trying to figure out exactly which gearsets were offered with the various engine/transmission combinations. If you have other Toyota vehicles, give me those codes too; I'd like to make this table as complete as possible, and would like to see if there are other cheap swap possibilities.

Most Toys sold in the US have 4.10 axle gearing, but this isn't always the case. Four cylinder models with auto trannies often have 4.30 gearing, (4.87 if they came factory-equipped with 31" tires). All V6's with 31" tires and 4-cylinder manuals with 31" tires usually had 4.56 gears. And still others have been changed by their owners, to move oversized tires.

One way of determining your axle type and stock gearing is to look for an Information Plate on your truck, on the firewall (prior to 1989) or door jamb (1989-current). It will look something like this:

C/TR/A/TM 138 HR11 G282 A130H or C/TR GJ7/KQ41 A/TM G251/R150F

These numbers are the Color (paint) code, Trim Code, Axle Code, and Transmission Code. You will also need to check the first few digits of you VIN #.

The first position of the Axle Code is a letter which identifies the diameter of the ring gear. Toyota trucks and 4Runners have always used the 7.5" and 8" diameters, but the others are listed here for completeness. The first table applies to Japanese-built Toyotas, which have VIN numbers beginning with "JT". The second smaller table applies to North American vehicles with a VIN beginning with "4T".

For example, my Japanese truck's code is G282. This means I have an 8-inch (rear) axle, 4.30 gears (which is common with automatic transmissions), and a 2-pinion design (common in 4 cylinders).

The highlighted cells in the first table are the values you are most likely to find in Toyota 4Runners and Pickup Trucks.

Toyota Differential Code Decoder - Vehicles with JTxxxxxx... VINs
First Position - Diameter of ring gear Positions 2 & 3 - Gear Ratio Final Position - number of pinions in the carrier
A = 138mm   01 = 3.300   25 = 4.556
31" tire option
  49 = 3.729   2 = 2 Pinions
Common in 4 cylinder models, but has been used in some V6 models
 
B = 145mm (NOT in trucks or 4Runner)   02 = 3.360   26 = 5.571   50 = 3.400  
C = 6.25"   03 = 3.545   27 = 3.364   51 = 3.736   3 = 2 Pinions (LSD)
(I've not ever seen this code in a pickup/4Runner)
 
D = 6.662"   04 = 3.556   28 = 4.300
AT, 225/75
  52 = 3.722   4 = 4 Pinions
Common in V6 and Turbo models
 
E = 7.1"   05 = 3.700   29 = 4.100
Very common
  53 = 3.250  
F = 7.5"   06 = 3.889   30 = 3.727   54 = 3.941   5 = 4 Pinions (LSD)
(I've not ever seen this code in a pickup/4Runner)
 
G = 8.0"
All 4x4 4Runners and Pickups
  07 = 3.900
4x2 4R V6 AT
also '81 4x4s
  31 = 3.909   55 = 3.333  
H = 9.0"   08 = 4.111   32 = 6.591 or 4.807   56 = 2.821  
J = 9.25"   09 = 4.222   33 = 7.503 or 5.583   57 = 4.058  
K = 9.5"   10 = 4.375
'80 4x4
  34 = 6.781 or 4.786   58 = 3.238  
L = 10.5"   11 = 4.444   35 = 7.636 or 5.600   59 = 3.234  
M = 12.5"   12 = 4.625   36 = 4.778   60 = 3.519  
N = 13.5"   13 = 4.790   37 = 3.583   61 = 2.724  
P = 14.0"   14 = 4.875
31", AT 22RE
  38 = 3.417   62 = 2.892  
Q = 12.0"   15 = 5.125   39 = 3.154   63 = 2.655  
R = 162mm   16 = 5.286   40 = 5.375   64 = 4.312  
S = 6.38"   17 = 5.600   41 = 3.308   65 = 3.837  
T = 6.7"   18 = 5.714   42 = 6.500   66 = 3.071  
U = 6.0"   19 = 5.833   43 = 3.550   67 = 3.526  
V = 10.6"   20 = 6.167   44 = 3.214   68 = 3.095  
W = 15.5"   21 = 6.667   45 = 3.533   69 = 4.176  
X = 142mm   22 = 6.780   46 = 2.929   70 = 5.857  
Y = 158mm   23 = 6.833   47 = 3.944   71 = 2.962  
Z = 202mm   24 = 7.640   48 = 3.356   72 = 3.949  
73 = 4.285  

I could use some help here figuring which codes are common! If your truck or 4Runner (heck, even your car) has code elements which are NOT highlighted above, please email me with your C/TR/A/TM code, engine type, transmission type, model year, stock tire size, and country of purchase of your truck, and I will update the table. Toyota Differential Code Decoder - Vehicles with 4Txxxxxx... VINs
First Position - Diameter of ring gear Positions 2 & 3 - Ratio Final Position - Differential type
A = 7.5"   01 = 3.42   02 = 3.58   A = 2 Pinion, Open  
B = 8"   03 = 4.10   04 = 4.56   B = 4 Pinion, Open  
05 = 3.15   06 = 3.91   C = 2 Pinion, OEM Limited Slip  
We've found a number is discrepancies in this second table, so don't take it as gospel. The first table has so far proven to be accurate. Differential Types Open Differentials

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