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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

1994 thrust bearing issue

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Old Apr 20, 2012 | 10:30 AM
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1994 thrust bearing issue

I have a 1994 f150 with a 302, the issue i have been having is it keeps takeing out the rear thrust in the crank have had to replace the crank 3 times now and still haven't solved the problem any sugestions?
 
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Old Apr 20, 2012 | 10:45 AM
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What trans do you have? If auto, it could be that you have a ballooning torque converter problem. If so you would need to check the trans line pressures and replace the converter.
 
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Old Apr 20, 2012 | 10:51 AM
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it is an auto and when i replaced the crank last time i put a remaned converter in it that was about 20k miles ago
 
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Old Apr 20, 2012 | 10:52 AM
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ok stupid ? is it possible to check trans line pressure with the engin out of vehicle?
 
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Old Apr 20, 2012 | 10:55 AM
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Give us some backround on this:

was it rebuilt first and then 3 cranks? Or just went out and you've put 3 cranks in it?

When installing transmission, could you slide the convertor away from the flexplate after bolting transmission in? It should not be "tight".
 
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Old Apr 20, 2012 | 10:56 AM
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May have the same thing happening to the new converter if excessive line pressure. It would seem like something is putting extreme thrust on the crank.
No, engine has to be connected up and running and a pressure gauge fitted to the test port on the trans.
 

Last edited by Lazy K; Apr 20, 2012 at 10:57 AM. Reason: More info.
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Old Apr 20, 2012 | 11:09 AM
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ok the engine came out of a 1989 f150 that was in a car crash it was the only thing that survived. bought the truck with a blow engine they thew a rod though the block. so we put the 89 engine in the 94 chassis the trans was from the 94 the first crank was we had the wrong size flex plate in it so that one didnt last long. the second crank was blown front cover gasket got water in the oil and now it will be the third and im trying to get info to fix the issue once and for all. and would there be anything in the trans that could push the crank into the thrust?
 
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Old Apr 20, 2012 | 11:13 AM
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yes the converter did have play back and forth after i hooked the engine to the trans
 
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Old Apr 20, 2012 | 11:18 AM
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Anything strange going on with the transmission? What trans is it? Does it have a lockup converter? Does it lock/unlock normally, does the truck ever stall when coming to a stop?
 
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Old Apr 20, 2012 | 11:18 AM
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any idea on what the line pressures should run?
 
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Old Apr 20, 2012 | 11:20 AM
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the trans runs and shifts fine it started to have a sluggish lower end and when u hit around 3k rpm it would get up and go
 
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