When the Subaru Foresters first debuted back in the 1980s, they were a bit different from the rest of the Subaru lineup.
Instead of a traditional body, they featured a sporty front fascia and a rear fascia that had a rear spoiler and a small, flat rear spoiler.
Subaru also introduced a hatchback-style car in 1987, a vehicle that didn’t exactly have a huge following among the general public, but did garner quite a few reviews.
The Foresters also came with a limited-slip differential that was quite popular with fans of the era, which is how we came to be able to see the Foresters’ first-ever performance rear differential in a Subaru.
Today, we take a look at the Subaru Performance Rear differential, or PRRD.
The PRRD has been around since the early 1990s, when Subaru introduced the WRX, which was also the first car to feature the PRRD rear differential.
At the time, the PRD was a fairly radical design, but its popularity helped Subaru win the hearts and minds of fans with its ability to produce incredibly low cornering speeds.
While the PRRDs front and rear diffusers are completely different, they share many of the same advantages and disadvantages, like the low-lift design, and its low-profile design.
However, the two designs are actually quite similar.
Both the front and the rear of the PRRTDs diffuser are essentially the same, and both have an open side-firing design that allows them to move forward and rearward independently, but only one of them has a lower-lift shape.
The PRRDs open side openings are very narrow, with only a tiny amount of room for the rear axle to rotate.
The opening on the rear is much wider, allowing it to rotate in the air.
As a result, the rear differential on the PRRRDs is far less susceptible to front-end lift than the front differential, which would be possible if the rear diffuser were just a tad wider and had a bit more room to rotate, as the front diffuser is.
As you might expect, the front PRRD is also much narrower than the rear, and the PRRs lower-profile rear differential has less clearance than the WRRs.
The rear PRR is similar in that it’s much narrower, and has the same clearance to move.
The bottom line is that the PRRS rear differential is actually a better fit for the WRRRs rear end than the PRTDs.
In this way, the WRRS rear end performs much better in everyday driving than the original WRRS.
The WRRS does have some disadvantages, though, including the fact that it has to use a different front end that requires a new front differential to be installed, which can add another $10,000 or so to the price of the WRR, and it’s slightly less reliable.
In addition, the first Subaru WRRS came with only one rear diff.
The second Subaru WR RS came with three, which allowed it to compete with the new Porsche 911 Turbo in performance-oriented racing.
This rear differential design wasn’t the first of its kind, and Subaru had a number of rear diff options for other models over the years, including a rear diff that allowed the rear wheels to rotate independently, a rear differential with a very small opening, and even a rear bumper that allowed for the front bumper to rotate out of the way when driving in a straight line.
While some of the differences between the WR RWD and the WR RRD are more obvious than others, the fact remains that the WR RS rear diff is one of the most popular rear diffs in the world.