Changed Radiator, sudden transmission issue - Ford Powerstroke Diesel Forum
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Old 10-21-2013, 12:42 PM
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Changed Radiator, sudden transmission issue

I just installed a brand new radiator in to my 2002 F350 7.3L diesel. 144k miles.

Immediately after installed the radiator, I noticed the transmission is suddenly not shifting cleanly. There's a hesitation when shifting into reverse, and sometimes the engine seems to bog down then "kick" into reverse.

This happens intermittently, and sometimes when I decelerate to a stop, it will do the same thing.

I noticed also, when I shut down the engine, I can hear a air "hissing" noise coming from the transmission. It goes on for a few seconds, then slowly stops.

When I changed the radiator, I did wind up adding some additional Mercon ATF after some ATF fluid was lost. The truck is definitely due for a transmission flush, but this happened literally after the first test drive after replacing the radiator when previously it was fine.

Is there something I missed perhaps during the radiator swap? Any suggestions would be really appreciated.

Thanks!

Last edited by Joe1911; 10-21-2013 at 12:51 PM.
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Old 10-22-2013, 09:41 AM
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I wonder if there is something blocking the flow of transmission fluid in the radiator? To check, you could take the cooler line loose at the radiator inlet and time how long it takes to fill a gallon jug. Then take the line loose from the radiator outlet and time how long it takes to fill a gallon jug. That is all I can think of?
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