| Re: [GMCnet] 455 to 403 coach swap issues? [message #325341 is a reply to message #325340] |
Mon, 23 October 2017 16:10  |
James Hupy
Messages: 6806
Registered: May 2010
Karma:
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Senior Member |
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The 403 engine oil cooler lines work on the 455. Not the other way around.
The oil filter adapter is surrounded by the exhaust manifold on the
passenger side. The a/c brackets and fuel lines in the vicinity of the
mechanical pump are different also. The late (77 & 78) coaches are hampered
by the front body mount support brackets. But, the 455 bolts up to the
cross member and transmission the same as the 403. Power steering pump is
the same, but spacers and brackets are different. So is the alternator
support brackets. Best to have all the brackets from a 455 to do the swap.
Watch for misalignment on the drive pulleys. Exhaust pipes will need some
work, too. Just my observations, yours might vary a bit.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
On Oct 23, 2017 1:43 PM, "Charles Boyd" wrote:
> The oil filter adapter is different also. The one piece oil cooler lines
> should work.
> --
> C. Boyd
> 76 Crestmont
> East Tennessee
>
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