New Venture Gear T-case terminology: In a separate conversation with me, Sankar K. Mohan of New Venture Gear defined what the numbers on their T-cases mean:
The first number is the number of speeds:
"1" = one speed (high range). Example – the NV 136.
"2" = two speeds (high range and low range). Example – the NV 241.
The second number is the strength:
The NV 241 is designated "4" in strength – tougher than the NV 231, but not as heavy duty as their largest T-cases, which go up to a "7" (eg, NV 273, for vehicles with a GVW of 17,500 lb).
The third number designates the type of T-case:
"1" = part-time 4WD
"2" = full-time 4WD with an open center differential plus lockable part-time option – like the Selec-Trac NV 242 of the Jeep Cherokee and Dodge Durango, or the Hummer’s NV 242HD AMG.
"3" = electrically shifted.
"4" = not currently used.
"5" = Torsen-type differential.
"6" = computer controlled multi-plate wet clutch, like GM’s AutoTrac NV 246.
"7" = GeroDisc – like the Grand Cherokee’s Quadra-Trac II NV 247.
"8" = not currently used.
"9" = viscous coupling.
An even more in depth explanation here:
http://www.bc4x4.com/faqs/yj.cfm?cat=6&faqid=162#faqtop
(This information taken from a post by Muslhed on TXZR2.com)
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