I'll have a look, but as Mark mentioned the speedo gear if changed on cable may not play well with old drive gear under rear housing and bits of shaved plastic could be what ate the new double seal. My speedo has not worked for a long time, your speedo is knowing what gear your are in and the...
No but there is a gear reduction/increase dealio inline on my 1970 fj40, mounted to one of the tcase inspection cover bolts, not sure what it does. Might be a missing piece on your set up.e