Not all T18's and T19's are the same.
I put a T19 in a CJ5 a couple years ago.
These two tranys are brothers and will bolt in place of each other.
The T18 came in 6-1, 4-1 first gears with a non sync first gear
The T19 came in 6-1, 5-1 , and 4-1 but they are fully syncro in all gears.
a 6-1 first is vertually a unusable gear for daily driving.
I loved the 5-1 and found I used it all the time. The T19 is easy to find with the 5-1 first.
Any 300, 302,351 in early 80's F150 or Bronco's.
I paid 50.00 for it from a wrecking yard.
The 6-1 T19 only came in Scouts and were very rare!
1984 CJ7, 258..HEI..MC2100, T176/D300, D30/M20 lockers, lift, warn winch!
"When in doubt! Gas it out!"