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Home » Public Forums » GMCnet » [GMCnet] Reviving the Cad 500  () 1 Vote
Re: [GMCnet] Reviving the Cad 500 [message #163524 is a reply to message #162802] Mon, 19 March 2012 11:45 Go to previous messageGo to previous message
Ed Jarmul is currently offline  Ed Jarmul   United States
Messages: 16
Registered: March 2012
Karma:
Junior Member
Rob, I feel your pain and have to weigh in on this one with a short excerpt
from a recent Internet search since I have a 500 in my 75 Cadillac and
"bullet proof" Turbo 400 as well.



1. You want the radiator heat exchanger to be the last thing in the
hydraulic circuit before the fluid is returned to the transmission. If you
add an external fluid cooler (a really good idea), place it before the heat
exchanger so that the radiator heat exchanger has the "last word".

2. Keep the restriction in any cooler low. Since a high volume of oil
flows in this circuit at times, you need low restriction to avoid having
pressure build up in the torque converter. That pressure buildup is bad for
a lot of things, including the engine's thrust bearing, the torque
converter, and the various bearings and washers in the transmission which
handle the axial thrust load. In a really bad case, excess converter
pressure can crack a transmission case.

3. Do not block the hydraulic lines in any manner. This includes
thermostats and shutoff valves. Blocking the fluid flow not only results in
very high converter and line pressures, it also causes a lack of lubrication
inside the transmission which will quickly lead to transmission failure.



This article deals mostly with adding an extra transmission cooler but the
pressure buildup due to a restriction/converter issue can be extreme causing
engine trust bearing failures.



Just a thought and I have the complete article if interested in ideas for
controlling fluid temperatures, the killer of any automatic transmission.



Ed J

73 & 77 GMC 26'

75 Deville

69 Vette

Schenectady, NY



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