[Phantom]

The only varrients of the 3.8 Buick V6 are:

The 231 odd-fire this was a v8 with the bore increases to 3.8 inches and had 2 cylindars removed, made in the early 70s most likely not it.

The LD5 or in California LC6 had smoother firing pattern and larger valves in 1984 they added sequential fuel injection and a distributorless ignition. This one is more likely to be what you are looking for the FWD transmission used here was the THM325-4L it has an overdrive gear but I'm not sure of the gear ratio if you find it remember that there are several differentials used and each change the ratio some. I believe that transmission had the same feature as the TH440 where you can change the automatic shift points by turning a cable. A side note the TH440 was later renamed the 4T60e that was used from 1984-94 and replaced by the 4T65e.

In the mid 84 the first engine dubed the 3.8 FWD was released with the changes being the mounting points and multi point fuel injection and the ignition used a destributor. In 86 they went back to sequential fuel injection and a distriburot less ignition in 88 they went from flat tappet lifters to roller lifters.

Now is the 3800 (Pre-series) LN3 from 1988-1991 here most of the changes were made to the motor including multiport fuel injection, a new balance shaft and on-center bore spacing.

In 1991 the 3800 series I L27 was started and used Tuned Port Injection in 1993 they revised the roller lifters with a more efficient versions.

I will stop there on the history of the 3.8/3800 before I start going into the OBDI to OBD1.5 and OBDII changes, changes in deck heigh water pump and casting changes the next set of transmission changes and the 4 different NA upper intakes that came after that and im not even including the different superchargers.

I did not get to read the last post on the first page as I have to leave work and sorry about any misspellings as I typed this in notepad.