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assuming you have looked at the linkage, and all that is okay,, the gas pedal works well and watching someone press it and looking at your linkage it moves freely... then I would say your TPS is bad.
Do you know which of these your truck has ?
Transfer Case - BW 4401 (Two Speed Manual)
Transfer Case - BW 4470 (Two Speed Manual)
Transfer Case - NVG 241-NP2 (Two Speed Manual)
Transfer Case - NVG 243-NP1 (Two Speed Selectable)
Transfer Case - NVG 246-NP8 (Two Speed Automatic)
when you droped the trans pan .... there was a magnet in the pan.... you didnt happen to move that did you? if you did metal shavings from wear and tear could get syphoned through the trans . also the magnet could also be blocking the ports for those gears...
in 1991 chevy used 3 differant trasmission's a 4L60-E, 4L80-E and a 700R4 in 1993 they used 2 differant transmissions a 4L60-E and a 4L80-E if your truck has the 700R4 then the 93 transmissions will not work if you ned to find out what you have in your truck and what is in the other truck. if they are the same they will swap the only diffance in the ext. cab and reg cab is the drive shaft. but the transmission have to be the same modles a 4L60-E will not replace a 4L80-E and nothing will replace the 700R4.
Check to see if you have power to the break switch first the Check the Brake pedal switch to make sure it is working with a meter. Is the power passing through the switch.
I have seen the wire chafed under the dash passing through the cutouts in the dash chassis just above the steering column.
The brake light switch is at fault. Get a new one and replace it. The location is at the brake pedal area mounted on a bracket with a plunger stud that rest on the brake pedal's arm the pad is attached to
You could have a sticking cable to one of the rear brakes. Need to inspect it from below. If you do a lot of off-roading the cable may only need lubricated.
Jack the wheel up and grab it at 12 and 6 o'clock. Try to move it in and out. If it moves then the wheel bearing is going bad and must be replaced right away. If the wheel won't move then take it off and check the warning scrapers on the brake pads. They are on the inside pad so use a light and see if they are contacting the rotor. If thy are then new pads are in your near future. One of these should solve your problem. Hope this helps.
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