QCDriver Posted January 25, 2007 Share Posted January 25, 2007 Service bulletin SB329006 has been revised to add a note stating that testing the transmission fluid for glycol contamination is mandatory following a transmission oil cooler replacement due to a leaking cooler. Release of Mack Trucks, Inc. Service/Warranty Information. Identification Number is: SB329006 Subject: Automatic Transmission Fluid Contaminated with Engine Coolant — Allison Automatic Transmissions Quote Link to comment https://www.bigmacktrucks.com/topic/2070-fyi/ Share on other sites More sharing options...
Guest Bollweevil Posted January 26, 2007 Share Posted January 26, 2007 I am not familiar with the transmission cooler used with these transmissions. Is it an integral part of the radiator, or completely separate? I am familiar with a similar problem that GM had in the mid to late 70's. The cause is a deterioration of the solder joints inside the cooler it's self. Now, since transmission oil pressure is greater than cooling system pressure, You will usually see transmission fluid in the radiator first. The more transmission oil the more the coolant will look like a strawberry milkshake.. Another indicator is coolant hoses, they get soft and swell, and actually appear greasy. Back in those days I had to rebuild a lot of turbo 350's and 400's, and it was always messy. Bollweevil Quote Link to comment https://www.bigmacktrucks.com/topic/2070-fyi/#findComment-10004 Share on other sites More sharing options...
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