^^^ Not sure but I think that I might have generated some confusion so let me make an attempt to clarify. Almost all Porsche 911's from the beginning have had at least a 5-speed transmission. There are some strange exceptions having to do with a clutchless manual transmission but we'll ignore those.
In 1976 Porsche introduced the 930 or 911 Turbo. Because of the immense torque the gears had to be stronger and the transmission casing would only allow enough space to fit 4 gears. So from 1976-1988 the 911 Turbo had a 4-speed transmission. Even the 934 the racing version of the 930 used a 4 speed transmission. Porsche claimed that due to the immense torque that acceleration times were very similar for the 4 speed vs. a 5 speed on the 930. The problem was the 930 had a lot of turbo lag and the longer gear ratios of a 4-speed transmission meant that the car took longer to come into the boost, which happened at roughly 3,800-4,000 rpm.
Ruf decided that to improve the drivability of their 930 variants that they needed a 5-speed transmission so they introduced a specialty 5-speed transmission in the early 80's around 1981. I think they sold it at the time as a separate part for around $9,000. You also have to remember that a lot of things were going on at Porsche at this time. The 911 had been slated to die and was to be replaced by the 928 and 944 so R&D dollars weren't spent on the 911. They 930 was initially a special homologation car and wasn't intended to be a permanent model and Porsche was struggling financially in part due to the energy crisis.
Well everyone knows that the 911 didn't die and ended up being the model that kept the company alive. The CEO at Porsche was replaced and refocused R&D on the 911 hence the 959 was born. In 1987 Porsche outsourced their transmissions to Borg&Warner and they created a much improved 5 speed for the 1987 911 which btw is referred to as either a G-series because of the body with the front and rear bumpers or it is also referred to as a Carrera or by its engine size 3.2L. I use engine size because the Carrera name was used by Porsche several times before as far back as the 356.
This new Borg&Warner transmission was much stronger and had better defined gates. Anyone that has driven an older 911 prior to 1987 can't tell you what a difference that made. The stronger transmission was able to support the hp and torque of the 911 Turbo or 930, so in 1989 Porsche finally introduced a 5 speed, this was also the last year of the 930/911 Turbo model to be replaced in 1991 by the 911 Turbo/964 Turbo/965 (they all refer to the same car).
The next 911 model was the 964 which was also available starting in 1989 and had the 3.6L engine. A few years later in 1991 the 964 Turbo or some refer to it as the 965 was introduced and again Porsche had a 5 speed on that car. The 993 saw the introduction of the 6-speed transmission for both naturally aspirated and turbocharged engines.
So I hope that clears up the confusion I created. So to recap in 1984 if you bought a 3.2L Carrera it came with Porsche's less than ideal 5 speed :roll: but if you bought the 911 Turbo in 1984 it came with a 4 speed.