DIY poly rear diff bushings

[Elderloc]

I was thinking you could turn down the poly bushing on a lathe if you have one. Since you had to remove about 3/4 of the upper lip if you cut from the back and then trimmed off the top with a 45 degee chamfer like some other companies do to help with the sticking and loading.

Wish I hadn't sold my lathe, or eMachine shop worked in Poly I'd just get several sets cut. Can't believe no one will make these damn things there are 20k VR4 and RT or there. Oh well great write up things like this give me hope.

[fastfalcon94]

I tried to have a machine shop lathe my 90 shore poly down and they couldn't do it. They probably weren't using the right tools or something. They said they could have done mine with Delrin (sp?). I looked at it but it was an extremely hard plastic material that felt like metal so I decided against it. This same shop makes the Delrin bushings for Vermont Sportscar which builds the cars for the Subaru Rally team. I ended up making them work with a hand plane, a drill press, and a wood rasp.

[Elderloc]

I have not worked with it in years but you do need to use the right speed, and a tool like a razor blade, or a hook tool. It's machined all the time for seals and other stuff.



There are many other videos that show people milling 90a or other. It's done all the time, we did it CMI in the R&D labs when I worked there back in the early 90s.