1991 3spd auto ""HELP!!!"

[fixkick]

>> ok
well first thank you for the simplified links, but im no electrical expert,, me and automotive electronics have a long history of bad blood.
your welcome.

SO are you saying ill still need to change the ecu and harness even if I use the 3spd 3l30,, with the tcc plug.? (your ECU has no TCC pins, zero)
The MT ECU has no TCC controls no pins, for it nor wires in the harness. zero tcc parts on your car.
so to make the TCC work is just 1 wire and a switch, moving the TCC brain out of the ECU, to yours. you decided when to lockup.


see attached pics for trans tag and plug.
is it possible to go all the way back to a mechanical trans for this I have a source on a 1985 th180 which I believe should be fully mechanical..

the TCC can be , just not wired up and it stays, dead, and you get a 1972 3speed.
my guess is youre reading web pages on the 03-72LE 4 speed converting to the Volvo pure 4speed hydramatic.? from the LE means electronic shifted, the volvo has no LE tag mark.
Th180s, early.
Some very old 3speeds many had no lockup at all. no TCC locks.
its like the 4th gear. then 1,2,3, no slip.
you can wire up the tcc with a simple toggle switch on the dash called the highway switch. even with no relay. (or MPG switch)

recap
1: run no TCC (its a hyrda matic, shifts 1,2,3
2: wiring in new ECU (A/T B40 code) to TCC and relay per above drawing, and bam, it stock setup.
3: run a switch, human powered, lockup , on demand.

you will get 3 gears , regardless, of above but will lack in performance due to the below:

there is more the 3speed needs, it need 2 more inputs
the Vacuum modulator , vacuum line, super easy. no?
and
The TV cable , the throttle body has and extra bell crank TV lever and mount to make this fit up.
This the passing gear cable., lacking that, no passing. allowed, (LOL)
The vacuum mod, causes down shifts on hills (its load sensing)

ask questions, i will do my best to help.

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the plug
all that is there, is in the photo. below

history, the early trans has 2 pins but the second is not wired. (its a testing pin only , that was added later)
diagram deleted, at fixkick.com type schematic in the search box.

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the hack:
see pin 2,
connect a new wire from the Blk-white main power wire, above, to a toggle switch, then from the output of said switch to pin 2 on the TCC plug port. (a 4pin plug)
you flip the switch and 12vdc arrives on pin 2 and bam, she locks up.
as you can see the ECU has but one wire, and some brains to run it, correctly inside.
the shift table charts, are on my 3L30 page, shift points and TCC lock at all speeds and loads, out of the FSM book.
the is not an electronically shifted box, it's only the clutch lock, that is electric,
if driving in say town or off road its really not needed
and ive no idea how car is used . some guys here just use this car to pull stumps.... (only)