Is it a bolt on.....??? No it isn't. Can it and has it been done.....???? Yes, it can and something I did not too long ago. You have to modifiy the 460 ZF5's housing to make it work. Russ (typ4) was the 1st to do so, and so, it is called (at least around OB) the "typ4 mod."
See below:
I've pulled the C6 and I'm coverting the truck to a manual with a 460 ZF5 with "typ4" modifications to make it work on the IDI.
Here are the "typ4" mods being made to the 460 ZF5, the top holes were increased to 1/2 inch, the diesel adaptor plate bolted on and then used as a template for the remaining bolt holes/dowel holes:
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I used a 1/2 inch 4 fluted end mill to machine the diesel bolts holes. The reason for this is that a standard drill bit would drift toward the overlaping bolt holes in the bellhousing. The end mill with a drill press will machine the new holes straight and true.
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See what I mean about the benefits of using an end mill:
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Finished product:
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I also modified the '91 donor transmission floor pan to work with the ZF5 and '86 T-case shifter.
'91 pan on left and '86 pan on the right. Had to use the ZF5 pan as the '86 pan would hit the top of the tranny:
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The tools used to modify the tranny pan:
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HERE is a tech article on the subject as well done by Goofyexponent!
Heath