Mine only locks in OD, however my tranny shifts into OD and locks MUCH too early. For example, if I try to accelerate at partial throttle from 40mph to 50mph, the tranny will downshift and then almost immediately upshift again to OD and lock.

My first thought when I bought the truck last year was a bad TPS. I hooked up my OBD2 scanner and watched the TPS. Everything seemed to be fine. I'll double check it again with the method on 4x4wire. Thank you for your suggestion.

Does my 98 have different gearing than my old 95LS?

1992 VR4 12.5 @ 110 - SOLD
1993 Stealth RT/TT 11.4 @ 129 - SOLD
1991 VR4 9.2 @ 159 - Old Shop Car
1992 Stealth Twin Turbo ATX - SOLD
1990 Montero LS LWB - RIP
1995 Montero LS - RIP
1998 Montero
1992 Galant VR4 474/1000
2007 Prius