OK, YOU HAVE ONE G54 TRANSMISSION BECAUSE YOUR 87 YOTA IS CARBURATED. THAT BLOCK-OFF PLATE ON YOUR TRANSFERCASE IS JUST TO INDICATE THAT YOUR TRUCK USES A FORWARD SHIFTING STYLE T/CASE.

TOYOTA'S TWO DIFFERENT T/CASE SHIFTING STYLES:
FORWARD (REMOTE):


TOP (DIRECT):


AND THE OTHER TRANSMISSION THAT YOU HAVE, BEING 5-INCHES SHORTER IS A CAST IRON VERSION KNOWN AS A L-TYPE TRANSMISSION, SUCH AS A L50 OR L52. DOES IT HAVE A REMOVABLE ALUMINUM BELLHOUSING? IF SO THEN ITS THE EARLY VERSION OF THE 4-SPEED, THE L42.

REGARDLESS OF WHAT IT IS, ITS NOT ONLY WEAKER, BUT BECAUSE ITS SHORTER IT WILL NOT MATCH YOUR DRIVE LINES, FRAME CROSSMEMBER BOLT PLACEMENT, NOR YOUR CAB SHIFTER LOCATIONS. EVERYTHING WILL BE DIFFERENT AND THIS IS LIKE PUTTING A GEO METRO 3-CYLINDER INTO A LOTUS

I CAN SAY MUCH ABOUT YOUR TRANS OTHER THAN IT SOUNDS LIKE YOUR SYNCHROS ARE WASTED.

FOR MORE TRANY INFO, CHECK OUT OUR WEBPAGE, INCLUDING PICTURES TO INDENTIFY YOUR TRANSMISSIONS.
Marlin's Transmission Rebuilding

REGARDS,
BIGMIKE