I found this on another forum, and havent seen it on here so i thought i would bring it over. Just a list of basic axles, their widths, and what side drop they are...

(F) = Front
(R) = Rear

Toyota
Mini (Hilux) 79-85 (F) 8" 55" (pass side drop)
Mini (Hilux) 79-85 (R) 8" 55"
Mini (Hilux) 86+ (R) 8" 58"
4Runners 96+ (R) 8" 60"
Tundra/T100 (R) 8.4" 66"
FJ40.45.55 (F) 57" (pass side drop)
FJ40.45.55 (R) 55"
FJ60.62 (F) 60" (pass side drop)
FJ60.62 (R) 58"
FJ80 (F) 64" (pass side drop)
FJ80 (R) 63.5"

Ford
Bronco 77 (F) Dana 44 58"
Bronco 77 (R) Ford 9" 57"
F250 78-79 (F) Dana 60 69.25" (driver side drop, king pin, leaf spring span: 31.5")
F350 78-79 (F) Dana 60 69.25" (driver side drop, king pin, leaf spring span: 31.5")
F350 '85-'91.5 (F) Dana 60 69.25" (driver side drop, king pin, leaf spring span: 36.5")
F350 '92-'99 (F) Dana 60 69.25" (driver side drop, balljoint, spring span: 36.5")
1/2 Ton '70 (F) Dana 44 65" (high pinion)
1/2 Ton '70 (R) Dana 60 65"

Chevy
K30 '79-'87 (F) Dana 60 69.5" (pass. side drop, king pin, leaf spring span: 32")
K30 CC '88-'91 (F) Dana 60 69.5" (pass. side drop, king pin, leaf spring span: 32")

Jeep
Cherokee Chief 81 (F) Dana 44 61"
Grand Wagoneer 89 (F) Dana 44 61.5"
Wagoneer 81 (F) Dana 44 60.5"
CJ-6 74 (F) Dana 30 51.5"
CJ-6 74 (R) Dana 44 50"
CJ-7 83 (F) Dana 30 56"
CJ-7 83 (R) AMC 20 55"
TJ Rubicon 03 (F) Dana 44 61"
TJ Rubicon 03 (R) Dana 44 60"

International
Scout 80 (R) Dana 44 60"

Mercedes
Unimog (F) 404 69" (driver's side drop)
Unimog (R) 404 69" (centered)
Unimog (F) U-1300 82"
Unimog (R) U-1300 82"
Unimog (F) 411 55.5"
Unimog (R) 411 55.5"

Nissan
Hardbody (D21) 86.5-97 (R) H233B 59"
Hardbody (D21) 86.5-90 (R) C200 59"
Frontier (D22) 99-2000 (R) H233B 62.5"

Isuzu
Trooper II 87 (R) Corporate 59"
Rodeo pre-'97 (R) Dana 44 58" (sua)
Rodeo 97-99 (R) Dana 44 60.5" (4-link)
Rodeo 00-03 (R) Dana 44 63" (4-link)

KIA
2000 Sportage (R) 60"