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Home » Public Forums » GMCnet » [GMCnet] Reviving the Cad 500  () 1 Vote
Re: [GMCnet] Reviving the Cad 500 [message #164047 is a reply to message #163628] Sat, 24 March 2012 11:09 Go to previous messageGo to previous message
GMC Cruse is currently offline  GMC Cruse   United States
Messages: 606
Registered: June 2009
Location: SE Michigan
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Senior Member
Ken Henderson wrote on Tue, 20 March 2012 13:29

Bob,

The transmission was in the new front clip I installed a few years ago,
behind the 455 I replaced with the 500. It was rebuilt by a reputable shop
in Nashville -- before I put maybe 20,000 miles on it. The removed 455 is
still in my shop on an engine stand, so yesterday I checked end play on its
crank -- imperceptible without putting a gauge on it. So, IF the
transmission has a problem, it's probably arisen during the 11,000 miles
since I installed the 500. Which is not unreasonable, considering what
happened to the thrust bearing this time in <300 miles. If the situation
was as bad when I installed the 500, it certainly wouldn't have lasted as
long as it did before the first failure.

This morning I dug through my stuff and found a couple of 160 psi pressure
gauges. When I decide to get greasy again, I'll connect one of those to
the 425's service port and tee the other into the converter output to the
cooler. It's not going to do much more damage to the engine than is
already done while I check those pressures.

Ken H.






Ken:

You probably already saw this old service bulletin info by "wbryant" on the photo site, but in case you haven't:

http://www.gmcmhphotos.com/photos/showphoto.php?photo=42694&title=rear-main-thrust-failure&cat=5293


Mike K. '75 PB Southeast Michigan
 
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