C6 NP 205 adapter difference?
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Senior User
Joined: Feb 2006
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From: Seatac, Washington
C6 NP 205 adapter difference?
Swapping in a 205 for a 203 and can't figure out which adapter I need for my C6. There is a short aluminum adapter and a longer cast iron adapter. The shorter one is the same length as the 203 adapter, which would mean no output shaft change, which would be nice. The truck is a '76 F150 with a 390 in it. All the info I can find is on a 78-79 with 351s or 400s, and even that info isn't clear. Thanks in advance for the help.
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Senior User
Joined: Feb 2006
Posts: 182
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From: Seatac, Washington
No, you can't, I tried to. I cut the notch for the shift rail, so that part fits, but the intermediate shaft nut hits the driver side ear for the mount. I would have to grind away almost the whole mount to get it to fit. Same bolt pattern and spline count, it bolts up but you would have to damn near cut off the drivers side mount to make it work.
The red arrow hits this:
The red arrow hits this:
Cargo Master
Joined: May 2010
Posts: 3,365
Likes: 12
From: NW Indiana
My highboy is set up with the longer adapter. For me it moved the t-case back a bit alleviating a pretty steep front DS angle.
It still required a custom trans CM to clear the D cardan and new output shaft in the trans. There was a company out out Ohio that parted out transmissions that I found on ebay that had the shaft.
IIRC the T case linkage all worked out fine.
It still required a custom trans CM to clear the D cardan and new output shaft in the trans. There was a company out out Ohio that parted out transmissions that I found on ebay that had the shaft.
IIRC the T case linkage all worked out fine.
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