To expedite your order, whether you call, fax, or email, please have the following information.

Model:
Be specific - Willys Jeep doesn't help.  Is it military or civilian, CJ type wagon or truck?  Military models include - MB, M38, M38A1, M170,   M715, M725. Civilian models include CJ-2A, CJ-3A, CJ-3B, CJ5, CJ6,  CJ7, CJ8, to name a few.  Two wheel drive types are DJ or Dispatcher Jeep.

Year:
Determining the year of your Jeep can be difficult if it is a CJ built prior to 1972.  In some cases the model is more important than the year.  Don't take for granted that the year listed on your title is correct. In some cases,  use of the Serial Number can narrow the year of the vehicle down to two or three year models.  Serial numbers are also important due to mid year changes.  When a mid year change occurs, a part number will be listed as: "up to serial number 8305-8556" and then the new part number will be listed as: "after serial number 8305-8557.

VIN:
Vehicle Identification Number - The VIN and the serial number are not the same thing.  The VIN is a combination of model number and serial number, the serial number is the last group of numbers in the VIN.  VIN plates are usually located on the firewall on the driver's side.  Early wagons and trucks had two locations, at least, the plate should be either on the left body pillar, front of the door or on the floor plate, left side, at the step.

Motor:
4 cylinders were used from 1941 through 1971 and then again 1980 through 1986.

The L head 134 is a flat head, sparkplugs are in the top of  the head, pointing at the hood. Intake and exhaust is on the left or driver's side.

The F head 134 has a valve cover. Sparkplugs and exhaust are on the left, carburetor on the right.

1980 through 1983 GM 151 cubic inch, 4 cylinder, carburetor on right side, exhaust on left.

1984 through 1986 AMC 150 cubic inch, 4 cylinder, intake and exhaust on left side.

Straight 6 cylinder engines were 226 cubic inch - Willys Super Hurricane Flat head, 230 cubic inch Kaiser Tornado overhead cam, and 232 and 258 cubic inch AMC.

1966 through 1971, Dauntless V6 Buick 225 cubic inch, oddfire.

V8 engines include the AMC 327, Buick 350 and AMC 304, 360, and 401 cubic inch motors.

Transmission:
Too many to list. For identification, look on the side of the transmission case, right below top cover. There is a letter "T", then a number (e.g. T84,   T90, T86, etc.)  This is good through 1971 on CJ's and 1979 on Wagons and Trucks.

1969 and later, T-14 casting number starts out 13-02, on T-15, casting  number starts 13-07, T-18 starts T-18 or 13-01, and T-98 casting number  starts T98.  1976 through 1979, 3 speed CJ's had T-150 - Tremec - casting numbers start with 260---, located on the top cover.

1980 through 1981 SR4 - 13-32

1980 through 1986 T170 series - 260----, located on the top cover

1982 through 1986 T4 and T5 - 13-52

Automatics were GM Th400 through 1979 regardless of motor, 6 cyl or 8 cyl

1980 through 1986 CJ's - Chrysler Torqueflite 6 or 904/999 4 cyl, 6 cyl, or V8

1980 and up, Wagons and Trucks - Chrysler Torqueflite 8 or 727

 If you need gears for a transmission, either the tag number or a tooth count is absolutely necessary.  From 1947 through 1979, in most cases, overall length of the input shaft is also necessary information.

Tag numbers and casting numbers are not the same thing.  Casting numbers identify the model of the transmission.  Tag numbers identify the application of the transmission.  If your transmission has a tag, it will be under one of the bolts holding the top cover on, except for the T 170 series which will have a tag riveted to the right side of the transmission case.

Transfer Case:
There are several to deal with, generally speaking, 1941 through 1971 used the Dana Model 18.

1972 through 1979 used the Dana Model 20, a single stick transfer behind all standard transmissions. Commando's with automatic transmissions also used the Model 20 and it was available in Wagons and Trucks with the TH400 automatic.

1973 through 1979 Quadratrac, used behind the TH400.  A much maligned but very tough transfer case.

1980 through 1986 CJ's used the Dana 300 regardless of the transmission, automatic or standard.

1980 and newer Wagons and Trucks all used one of several different New Process transfer cases.

Axles:
There are 4 front axle models, all Dana, they are Dana 25, 27, 30, and 44. The 25, 27, and some 44's, are closed knuckle types. You can't see the inner and outer axle shaft joint. All 30's and most 44's are open knuckle types - you can see the axle shaft u-joints.

At the rear, the axle models are all Dana except one which is a Timken  axle.  Rear axle models are 25, 41, 44, 53, 60, and 70.  The Timken is easy  to spot because it looks so different, the left and right axle tubes and center  housing bolt together.  Timken axles had a relatively short run, late 40's to early 50's trucks, it is a heavy duty axle.

Miscellaneous:
Your right, my left. The accepted method for determining right and left is as follows; sit in the drivers seat, left side parts are the parts on your left and right side parts are on your right.  This applies even if you are standing in front of and facing the vehicle.

The more correct information you have, the quicker your order can be handled.