The air injector comes from the exhaust manifold, around the back side of the block and around to the AFM. I believe started with trucks in 1988 and later. Looking at FSMs for 87 and earlier mention nothing of the air injector and the difference in exhaust manifolds. The 87 and earlier seem to...
My Toy
1985 Toyota 4x4 longbed
22RE with auto swapped to 5spd
Dual Ultimate Marlin Crawler tcases
Longfields
5.29s with lockrights front/rear
Bucket seats out of '92 Runner
37/14.5/15 Toyo MTs
5" Marlin Trail Flex kit
Marlin Crossover steering
Custom front bumper
Custom Tube Bed
Inchworm makes a a340h tranny to gear driven adapter. Basically you have to tear down the tranny to get it installed.
Inchworm Gear - Toyota Rockcrawling Equipment
Don't have to but I'd think they are a better shifting tranny. You can swap to a newer version as seen here
Tech: Automatic...
To me, if the driver side hub was bad and not engaging the axle that it would cause a hard pull to the right in 4wd especially at higher speeds. Worth checking since your cv's appear to be fine.