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post #1 of 7 (permalink) Old 10-20-13, 12:45 AM Thread Starter
warren
 
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Ford falcon 5R55S AUTO slips cold

Hello . We have a problem with a 5R55S Transmission [ford]. Vehicle came in with water in fluid. We rebuilt trans all new frictions ,seals ,solenoids new valve in pump. Fitted new cooler. After two weeks vehicle came back . Complaint was slip when cold on heavy throttle mostly noticeable in 1st,2nd and 3rd.Trans drove well when hot. We checked main line presure at the port on left side . Presure was correct at idle and stall with good rise on part throttle. We removed and dismantled trans we found small bolt that goes into centre suport had been left loose and rear clutch which is feed through centre support was badly burnt .we also dismantled and checked valve body and gaskets all was ok .Reassembled and refitted trans .Fault was exactly the same . Even though we found centre support was loose this did not correct fault. Vehicle drives good hot . We also checked filter pick up height from bottom of pan , and over filled with fluid but this made no difference.

We would appreciate any sujestions that would help us find the fault.

Cheers Warren

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post #2 of 7 (permalink) Old 10-20-13, 01:35 PM
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Re: Ford falcon 5R55S AUTO slips cold

Difficult to tell, but I'd be looking at the seals, first, fit and alignment second.

Ever notice that there's so many high performance parts available for GM products?

Did you ever think that maybe they NEED them?
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post #3 of 7 (permalink) Old 10-20-13, 06:53 PM
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Re: Ford falcon 5R55S AUTO slips cold

If it slips in 1st 2nd and 3rd it sounds like an issue with forward clutch. If it was just second it would be int/overdrive band.just 3rd would be the other band.


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post #4 of 7 (permalink) Old 10-21-13, 12:31 AM Thread Starter
warren
 
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Re: Ford falcon 5R55S AUTO slips cold

Its the forward clutch for sure , has new piston with moulded seals and other new parts as well, but cant figure out why its still slips cold.

Cheers for your replys
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post #5 of 7 (permalink) Old 10-21-13, 05:42 AM
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Re: Ford falcon 5R55S AUTO slips cold

Are you able to air test the Trans?


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post #6 of 7 (permalink) Old 10-21-13, 11:10 PM Thread Starter
warren
 
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Re: Ford falcon 5R55S AUTO slips cold

Yes took valve body of and clutch air checked fine. Also when trans was repaired we put new seal rings in that feed the clutch ,We bore checked rings before fitting and they were OE style rings.

Thanks for your sujestion
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post #7 of 7 (permalink) Old 10-22-13, 05:31 AM
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Re: Ford falcon 5R55S AUTO slips cold

Only other thing I can think of would be maybe a cracked drum. Possibly in the snap ring area. When clutch is applied may not be holding properly.


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