OK.... this is a bunch of crap i've pulled together during my 8.8 swap and after while just looking things up for other people performing the swap. At the bottom are links to some pages with details and pictures from ford 8.8 axle swaps.

These are the codes you will need when out shopping for your 8.8

Axle tag codes:

3L73 = 3.73 LS

4 10 = 4.10 open

4L10 = 4.10 LS

and so on

Door codes:

43 Open 3200 3.08

41 Open 3200 3.27

42 Open 4.10

46 Open 3.73

45 Open 3200 3.55

D4 Limited Slip 3200 3.73

D2 Limited Slip 4.10

L73 Limited Slip 3.73

Here's all the specs, measurements, and misc crap about the 8.8 you'll ever want to know.

Ford 8.8 specs:

Weight (complete assembly w/ brakes etc.): 174 lb.

Axle shaft strength: 6,500 (lb. ft.)

Drivers side Ford brake hose #:F5TZ-2282-A

Passenger side brake hose #: XL2Z-2282-AA

Bolt size (U-joint flange to yoke) is: 12 x 1.75 x 30 mm

Driveshaft Flange: Spicer Part Number 2-2-1379

Measurements:

O.D. of tubes: 3.250".

Tube thickness: .250" (some are .188”!)

Ring gear diameter: 8.800".

Ring gear bolts: 7/16" dia. (qty. 10).

Pinion diameter/splines: 1.625 / 30.

Axle shaft/splines: 1.320 / 31.

Rotor thickness (where it mounts to axle is .250").

Overall width 59.625" (the F8.8 is .950" narrower then a TJ Dana 35).

Hole diameter for ABS sensor in top of housing: .811".

Centerline of housing to C/L of pinion difference is 3.875" toward the P/S.

Pinion offset: P/S to C/L of Pinion, 27-3/4" (no rotor on axle), D/S to C/L of Pinion, 31-5/8" (no rotor on axle). (this measurement is 2.5" more offset to the P/S then a TJ Dana 35).

Here are some comparison pictures of ford 8.8 to D35. (the bigger one is the 8.8!!!)






And here are the links... great info here.. and lots of pictures.
Stu, from Stuoffroad.com's write up

Rough Riders write up

some guys write up, good pics