can you post a picture? I can see if I can find it in my cj manual. Their are not alot of choiced on the 3 speeds...Have you ran a google search on the casting numbers on the Transmission ?
1979 Jeep CJ5 with 304 V8, T18 Transmission, Dana 20 Transfer case with TeraLow 3:1 gears, 4.88 axle gears, Detroit Locker up front and Ox Locker in back with 1 piece axle shafts, 36" SuperSwamper SX Tires, Shackle reversal, MileMarker Hydraulic winch, MSD 6A ignition.
Sounds like a T-90 or maybe a T-86 . Do you have 2 posts on the left side of the tranny? If you have a column shift those posts are pivot points for the linkage, otherwise they aren't used. The Borg-Warner T90 Transmission - Novak Conversions
1979 Jeep CJ5 with 304 V8, T18 Transmission, Dana 20 Transfer case with TeraLow 3:1 gears, 4.88 axle gears, Detroit Locker up front and Ox Locker in back with 1 piece axle shafts, 36" SuperSwamper SX Tires, Shackle reversal, MileMarker Hydraulic winch, MSD 6A ignition.