If you have a 3.9 engine you have the AX-15 transmission, if you've got
the 4 banger you've got the NP2500. The AX-15 is a truck transmission
with fairly widely spaced ratios so there's quite a bit of speed
differential between the gears. They shift stiffly when cold, but can
be improved with a changed to synthetic gear lube. Mine has Redline
75W-90 gear lube in it which helps quite a bit. It's still a little stiff
when it's cold, but it's a lot better than with what it came with or with
Kendall synthetic. The Redline seems to reduce the inate stiffness when
cold in a shorter distance too.
Larry Elliott, '92, 3.9, 4x4, 5 sp'd, LE
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