|
|
||||
 NP 241 |
||||
|
|
||||
|
|
Phone Toll Free
|
NP241C
Starting in about 1987, the New Process 231/241 series transfer case became standard in Jeep, Dodge, and Chevrolet applications. These transfer cases are part time 4WD (Shift positions 4HI - 2HI - N - 4L). They have a relatively thin aluminum housing. They are 1:1 direct drive in high range, and use planetary reduction gears for low range with a ratio of 2.72:1 They use chain drive for the front output. The NP241 was typically used in V8 applications.
Exact identification:
These New Process cases have a circular plate, about 2" in dia., on the rear of the case, in the center. Full identification info for the case is on this plate
Bolt Pattern:
Jeep, Dodge and Chevy versions all use a 6 bolt circular bolt pattern.
This pattern is NOT symmetrical and will only bolt up one way. You can
typically bolt a Jeep unit to a Dodge transmission and vice versa, however
Chevrolet units are NOT cross compatible: While GM uses the same 6 bolt
patter, they have it rotate approximately 90 degrees from that used by
jeep dodge.
In all of these 6 bolt applications the Klune-V Extreme Underdrive will
bolt up to these transfer cases directly with adapters necessary. Some may
require a spacer.
Slip-Yoke Eliminator
All of these units we have seen have been equipped with a slip-yoke rear output. Slip-Yoke Eliminator kits are available for most of these transfer cases
Jeep / Dodge units:
All of these cases have a left hand drop (front drive
shaft on driver's side).
Input Spline: most applications use a 23 spline female input shaft.
All Dodge Cummins or V10 NV4500HD application 241s use a 29 spline. Also 99-up NV4500 standard duty gas apps
GM New Process 241 Transfer Case
In 1988, GM began using the NP241 transfer cases.
Most of these units will be right hand drop, but Chevy also used a few
left hand drop applications. The Chevy NP241 is supplied with a 27 spline
female input or a 32 spline female input. With a T350, 4L60E or 700R4
tranny, it will be 27 spline. With a T400 or 4L80E trans or 5 speed, it
will be 32 spline.
Transfer Case Shifter
In most cases the stock transfer case shifter can be retained in the stock
location. The linkage rod will need to be extended. This is done by
cutting the existing rod in the middle, slipping an appropriate length of
steel tubing over the ends of the cut pieces, and welding in place.