Upgrading no-LSD diff to LSD one

[Snejk]

Mux213 Wrote:However you mentioned that you found an open diff, so the question is, what do you currently have on your car? You do not change the diff unit itself to LSD, you probably can throw away the spare unit you have bought depending on what you got on your car.

Owh, you have a zenki levin, make sure you buy a zenki LSD or it won't fit, kouki is slightly different size.

I have a zenki levin (91 KW version), produced in late 1985 but sold to the first customer in Switzerland in early 1987. It has an LSD rear diff but the LSD is the only thing that is working. Diff housing and bearings are all beyond repair. The car was left standing for years, and then driven some without the diff oil. I bought it almost a year ago and went straight away to the toyota service, but it was too late. I have driven it for several thousand miles, and the noise was getting worse and worse and I had no heart to keep breaking an allready dead diff, and didn't want to risk being stranded somewhere when diff eventually blew up.
Now i have found an zenki open diff for 100 euros, and am currently fitting it, because I miss my car and will drive it even LSD-less .
If I could just simply put a TRD 2-way (zenki version, ofc) into the current open diff that would be great, but I also don't mind buying the whole damn thing if it is necessary for me to have the car back as it was .

If it is not possible to put LSD 'head' inside an open diff, I guess I will have to wait for one to appear in for sale section here.

Thanks for trying to help, I'm not that much into technical side of an AE86, but I like driving it very much and I hope I will learn a lot about it!