Not sure if this would ever help anybody or not, but if it does, then cool.
4l80e 2wd to 241 spacer with clocking ring. Total spacer face to face thickness of 2.451 using JB conversions 32 spline input gear.
Original piece of aluminum.
Centering up on the rotary table. My shop machines smaller parts in general so fixturing stuff here is all for smaller parts. I know my workholding setup sucks, I don't care though because it got this one-off job done. It worked until I could get the bolt pattern into the part. I was able to rough machine everything to within .001.
Rough machining down the face. Interior O-ring and locating groove can be seen in the middle hole of the part.
Other side. Machining O-ring groove and extruded locating ring.
Rough machined complete. Left .005 to take off each face.
Test fit (studs won't be in until later):
Drilling the bolt pattern. This pattern is not actually a "pattern". Each hole is spaced completely different and on a different radius from the center of the part. So the fastest option was to use the tailshaft of the transmission and dowel it into the adapter as we drilled. It locates off the extruded locating ring on the adapter.
Completed adapter. Faces finish machined and excess material removed. O-ring is inserted.
Other side of Adapter:
4l80e 2wd to 241 spacer with clocking ring. Total spacer face to face thickness of 2.451 using JB conversions 32 spline input gear.
Original piece of aluminum.
Centering up on the rotary table. My shop machines smaller parts in general so fixturing stuff here is all for smaller parts. I know my workholding setup sucks, I don't care though because it got this one-off job done. It worked until I could get the bolt pattern into the part. I was able to rough machine everything to within .001.
Rough machining down the face. Interior O-ring and locating groove can be seen in the middle hole of the part.
Other side. Machining O-ring groove and extruded locating ring.
Rough machined complete. Left .005 to take off each face.
Test fit (studs won't be in until later):
Drilling the bolt pattern. This pattern is not actually a "pattern". Each hole is spaced completely different and on a different radius from the center of the part. So the fastest option was to use the tailshaft of the transmission and dowel it into the adapter as we drilled. It locates off the extruded locating ring on the adapter.
Completed adapter. Faces finish machined and excess material removed. O-ring is inserted.
Other side of Adapter:
some people 
