It's a 3 speed transmission. Standard Trannys were 5 speed, but autos only have 3.
Top of tranny under shift lever.
is it an automatic, or manual shift?
Yes it will... you need to switch the flywheels though to mount it to the automatic transmission...
VERY CAREFULLY.
shift control solenoid.
The transmission throttle valve cable needs to be adjusted.
The A4LD transmission is the most common failure on early explorers. It's very likely that your transmission is failing.
The automatic transmission is an A4LD in a 1991 Ford Explorer
The transmission may need a flush and filter, or in my 92 accord I solved the problem merely by changing the transmissions computer.
1991-1996 Ranger automatic transmissions use Mercon type automatic transmission fluid.
The 1992 2.3L 5 Speed required Mercon Automatic Transmission Fluid. That's right, you need to put ATF in the manual transmission.
manual or automatic? if a manual a broken or damaged shift fork could be the issue or a clutch not releasing, running or not when trying to shift? if it's automatic, a shift solenoid or a transmission servo may be sticking or mechanical damage may be present such as a clutch pack or drum damage.