Adapting the TH350
There are 3 versions of TH350 output shafts, all are 27 spline:
Output shaft sticks out ~7/8” from the back of the case: This is the most common version and is the output that came mated to either an NP203 or NP205 transfer case.
|How to use with 203/205 doubler||Use factory TH350/NP203 adapter, very common|
|How to use with Magnum underdrive system||New 1” thick adapter from ORD|
|How to use with NP205 alone||Use factory TH350/NP205 adapter and drive sleeve, these parts still available new as of 2014|
Output shaft sticks out ~2-1/2”: This one was used with NP208 transfer cases in the early 80’s.
|How to use with 203/205 doubler||Drill/tap six bolt transfer case pattern into face of NP203, plug up stock holes and make a tab to hold down the idler shaft|
|How to use with Magnum underdrive system||Magnum box bolts up as is, no changes|
|How to use with NP205 alone||No option, output shaft has to be changed|
2WD TH350 output shafts are not useful for 4WD applications, the output shaft needs to be changed.
Below are some images of the TH350 to aid in identifying: