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Hi folks. My 68 is numbers matching, my plan is to shelf the entire drivetrain and replace with daily driver stuff so I'm not worried about tearing up some history. So I started with a factory open rear end geared around 3:23 but hated the one tire fire. I stumbled onto a nodular posi out of a 69 Judge with 3:90s. Fixed the fire but killed the road cruise. Now taching around 4000rpm at 75 on the interstate. I've been looking at options: ruled out the Tremek/TKO because I don't want to modify my floor pan. Considering the new Mcleod 5speed because its advertised as a direct drop in without modifications - but it is expensive... Ran across on old timer who mentioned a possibility and wanted to ask the forums for advice.


Has anyone converted the MY6, 4 speed, OD tranny's from the chevy/gm trucks into their goats? My understanding is the OD 4th gear runs at .74 which is way better than the 1 to 1 on my Muncie. The dimensions look very good too. I understand the tranny is actually a version of the Chrysler A833 and pretty darn tough. Another question is? Do they make conversion plates for the A833 to a BOP bellhousing? The MY6 has been hard to find and I'm still looking --- so if you have one sitting around? The A833s are out there if there is an adapter plate available... Anyone been there done that? Let me know. Thanks
 

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Hi folks. My 68 is numbers matching, my plan is to shelf the entire drivetrain and replace with daily driver stuff so I'm not worried about tearing up some history. So I started with a factory open rear end geared around 3:23 but hated the one tire fire. I stumbled onto a nodular posi out of a 69 Judge with 3:90s. Fixed the fire but killed the road cruise. Now taching around 4000rpm at 75 on the interstate. I've been looking at options: ruled out the Tremek/TKO because I don't want to modify my floor pan. Considering the new Mcleod 5speed because its advertised as a direct drop in without modifications - but it is expensive... Ran across on old timer who mentioned a possibility and wanted to ask the forums for advice.


Has anyone converted the MY6, 4 speed, OD tranny's from the chevy/gm trucks into their goats? My understanding is the OD 4th gear runs at .74 which is way better than the 1 to 1 on my Muncie. The dimensions look very good too. I understand the tranny is actually a version of the Chrysler A833 and pretty darn tough. Another question is? Do they make conversion plates for the A833 to a BOP bellhousing? The MY6 has been hard to find and I'm still looking --- so if you have one sitting around? The A833s are out there if there is an adapter plate available... Anyone been there done that? Let me know. Thanks

I don't think I would do it after reading this thread. This is for a Camaro, but still gives you a very good idea of what you might be getting into - NP440/MY6 Swap Info | NastyZ28.com
 

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I am installing a Tremec 5 speed, I was told by the vendor (SilverStar) the the 68 to 72 only may6 need a slight dimple to install. Now the 66 to 67 is another story....
 

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Discussion Starter #4
Update on the Upgrade. Found and installed a MY6. Pretty straight forward conversion. Had to have front bearing retainer turned down and message the shifter mounting bracket. Very pleased with the OD performance now.. I think we are going to trade out the Muncie on my sons 68 firebird with the MY6 next.
 
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