D20 Help

I have come up on a stumbling block with my T15 to D20(case only).

Of course the T15 has a countershaft and reverse idler shaft sticking out the back of the case

and the D20 case that I was going to use as a super 18, does not have a relief area for the shafts. Small hole D18 on the left and D20 case on the right. What the heck?? Did they build auto only versions of the D20? Can I take it to a machine shop and have it cut to match the one on the left?
thanks in advance
Tim

 

Take a gasket with that works with the Transmission and transfercase. trace the reliefs onto the 20 case mill depth to match the 18 case

 

tim send a message to nickmil
when it comes to transmission and transfer cases . he's the man

 

If it were mine, I'd make sure the case is thick there, mark the outline of the relief I want, set the depth I need on my drill press and drill/ remove as much as I could that way. Finish cleaning it out with a die grinder. I'm a little bit of a hands on caveman that way sometimes. I don't have a milling machine, but I don't think that relief needs to be that precise.

Feel free to ignore my thinking, others more knowlegable may shoot me down.