My son wrecked his 744T with manual transmission last summer. His replacement 1984 760T had an automatic, and he badly wanted a manual transmission in the car. The M46 with P type OD in his wrecked car had been giving some OD trouble, and I told Evan that we wouldn't replace a good automatic transmission with a bad manual transmission. I was able to buy a good 1987 M46 with J type OD very cheap. A P type OD is stronger, but J type we had. The J type is quite adequate for the job, and all Volvo did on the early turbo cars with J type was have the ECU disable injector number 2 when shifting into OD (or so the service manual says). My wife's 1986 745T came with J type OD, but has no disabling function for injector number 2. I told Evan the J type would survive quite fine if he shifted sensibly in and out of OD.

Turbo 700 series cars with manual transmission have a hydraulic clutch. NA cars have a mechanical cable clutch. On turbo cars the ball stud for the throwout arm is between the throwout arm opening and the input shaft as pictured below.



On normally aspirated cars the ball stud for the throwout arm is on the opposite side of the input shaft as pictured below.



In order to use the NA transmission in the turbo car all you have to do is remove the NA ball stud, and then remove the turbo ball stud and screw it into the NA transmission bell housing. The bell housing has a hex socket cast into it with a threaded nut in it just waiting for you to use. The ball stud from the turbo transmission is internally threaded has a metric stud that screws into it and also fits the nut in the bell housing socket.

The next transmission post will be on using a 240 NA transmission in a turbo 700.