SuperPro rear differential washer (front) kit. Keeping that rear held tight!

Hey!... Welcome to another #modmonday! This week we will be discussing @Superpro's rear differential crossmember washers for the Sti. These have been installed since 2015 and have been going strong ever since.

A noteworthy area for improvement on most Subaru's are the factory rear differential bushings. For the 93-07 Impreza, 98-08 Forester and Legacy/Outback variants these solidify the front diff mounting points.

The area in question… Given the age of these cars, if you live anywhere where it snows you can expect a bit of rust here.

The area in question… Given the age of these cars, if you live anywhere where it snows you can expect a bit of rust here.

The factory bushings attempt to hold it in place while keeping the noise to a minimum. But a quick 1-2 shift will show these aren't up to the task, a familiar thunk will be noted in between shifts, as the diff slaps against the bottom of the car. The rear diff bushing inserts/washers are the first line of defense to this issue.

But if you are looking to really keep that diff in place that is where these shine. The biggest downfall is a moderate increase in noise, but unlike a solid upgraded bushings they won't be as intolerable. For my already Sti with stiffened and upgraded bushings it added a slight hum at certain highway speeds.

Tough to see but there it is. The edge of the  bushing washer  sits on top and the bottom to stabilize it.

Tough to see but there it is. The edge of the bushing washer sits on top and the bottom to stabilize it.

With the diff held tightly in place you will notice on throttle is insanely responsive. With a slight jab to the throttle propelling the car like a stabbed rat instantly. On the auto-x course this is an excellent attribute to rocket yourself from sharp slow turns and leaving the starting line is just a squat and go ordeal.

This is from behind the mount, you can see where the bushing sits in between the bracket.

This is from behind the mount, you can see where the bushing sits in between the bracket.

These can be a bit much for those daily driving their vehicle everyday on the highway. Unless you have a excellent sound system or loud exhaust. A worthwhile trade off for those looking for on track/course performance.

Questions, comments, thoughts? Leave them below!

Amazon link

SuperPro Rear diff crossmember washer kit

Dan EngstromComment