What automatic do I have?

[Tatraplan]

My '83 engine is replaced with one from '88 and
I'm guessing that the auto tranny is as well. The
one sitting in the truck now is a four speed auto
with converter lock-up function. It had a four
speed auto from factory, but I don't think that
the lock-up function was available '83 when my
truck was built.

Above the oil pan is a little metal label that
reads: Hydramatic, code no "06 MH M 4". Does
anyone know what that means? Could it be a from
the same year as the "new" engine or is it the
original one from '83?

/Robert

[john8662]

I can't tell you what year the tranny is.

But, if you've got a 4 speed automatic transmission, then you've got a TH700 known as the 700R4 transmission.

Starting in '82 this transmission was used, and it was always used behind a 6.2 in light duty trucks/subs/blazers (except military).

The 700R4 had a locking TC from day one, so they all lock.

[ZZ]

The early 700R4's were easy to hook up a manual switch to the locking TC. They were grounded internally and had one 12v wire going in. The later ones are grounded through the ECM.

[opto]

Where are you from robert?

Do you have any problems with the transmission or are you just curious?

[Tatraplan]

Just curious. Both engine and transmission runs
perfectly well, but for future failiures I'd like
to know exactly what hardware I have.

/Robert

PS. I currently live in Link