Hi paula
what year?
what country?
what model bighorn, bighorns vary by country.?
what engine?
what transmission , auto or stick shift?
the word gear , is no clue.
if not sure, send photo of truck then of the shifter
sounds like car needs service, no?
SOURCE: Isuzu bighorn 1994 manual, slips out of 4th and
check gearbox oil level as dry syncro rings can also cause your box to jump out of gear ,detent springs are only for giving u the feel of positive gear engagement.
SOURCE: my 1995 isuzu bighorn need
THERMOSTAT STAYING OPEN CAUSE PCM STAY IN OPEN LOOP WHICH WILL CASE ENGINE RUN POORLY TRANSMISSION SHIFTING LATE.REPLACE THERMOSTAT SEE IF IT HELPS PROBLEM.
SOURCE: my isuzu bighorn automatic transmission slips at any forward gear but good at reverse.
This is an indication that the forward clutch pack has failed in the transmission or that the clutch pack has low hydraulic pressure from an internal fluid leak or a defective check ball. Pull the pan off the bottom of the transmission, if it is really full of dark sludge you will need to replace/repair the transmission.
SOURCE: isuzu bighorn year 1995, not changing gear after 1st gear
hwere is torque converter lockup solenoid located ?.
Japenese import no doubt as their no europeon certificate of homoglonation for this vehicle but the gearbox is the same as the isuzu i would imagine which if i remember rightly has a solonoid for each gear which is controled by a computer so firstly check the wiring loom from the brain to the gearbox as the wires could be damaged ,if they appear ok then either scrap it or try the dealers to see if how much they want to drop the gearbox sump and investigate,but often these parts here in europe are unavailable and only a complete exchange gearbox is listed in which case buy a nice manual range rover
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