Join Date: Jan 2005
Location: East of Seattle
Thanks, Robert, but I already have those pictures on file. I do a lot of research before I embark on a new project. I know that you can buy AD reproduction diff cases in Al or Mg from Alfaholics. I also thought about welding threaded Al lugs directly onto the case. Back when they were still around, Vintage Prep used to supply a sliding block setup with a bolt-on diff bracket and delrin block/plates. There are a number of options, mine is a hybrid.
I cut and drilled a block of Delrin. The Autodelta pin is about 22 mm diameter, but my Ti version is 19 mm. That allows a little more thickness for the Delrin block, and still allows it to fit in an Autodelta repro yoke. I figure the 19 mm pin is adequate since most Alfa panhard linkages seem to use 12 mm bolts in the spherical bearings, and race mustangs with Watts linkages use a 5/8" (15.8 mm) differential pivot pin.
Since the differential filler hole will remain functional, I need to be able to torque the Ti peg on and off, so I milled some flats on the end to fit a 14 mm wrench. Once I get the yoke mounted and figures for final clearances, I'll use washers to shim the block into position on the peg.
69 Spider, 2L, street; pursuit of happiness
69 Spider, 1.8L, race; happiness of pursuit