4R70W issues... maybe. - TCCoA Forums
 
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post #1 of 7 (permalink) Old 07-05-2005, 04:42 PM Thread Starter
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4R70W issues... maybe.

My fiancee just mentioned to me that her transmission has been acting flaky from time to time. She said what it'll do is not shift out of first, she tried turning off OD, and moving the shifter to 2, no change. She says after a while, it will finally shift (I'm assuming after fluid warms up). No SES light. Any ideas? About two years ago, a bonehead shop changed the fluid and put in Mercon/Dextron III . I changed that out for Merc V as soon as I possibly could...

Any ideas what I could look for/do to try to flush out the gremlin? First thing I'm going to do when I get back to NY is scan for codes and go from there.

I hate intermittent problems.. trying to find the cause is like trying to nail Jello to a wall...

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post #2 of 7 (permalink) Old 07-05-2005, 06:23 PM
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If she keeps accelerating will it eventually go into 2nd though shifting at higher RPMs than usual? Or if she puts it into manual 2nd from a stop, or manually downshifts to 2nd from auto-3rd at 45 mph or so (assuming it gets to that speed), will it hold 2nd then? From auto-3rd will it kickdown to 2nd when given WOT, or overrev?

I ask because this spring my car would infrequently do the 1-2 at abnormally high RPMs, and hit the rev limiter or even go over when it should have kicked down from 3-2. Manual 2nd always held. Recently something failed in my trans with the result of me losing automatic 2nd though manual 2 works. I'm 90% sure it's the intermediate-one-way roller clutch that let go on my car.

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post #3 of 7 (permalink) Old 07-05-2005, 06:45 PM
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Broken accumulator spring?

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post #4 of 7 (permalink) Old 07-05-2005, 07:22 PM Thread Starter
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I think she said it would not upshift period. I hope it'll do it after I get back to NY while I'm in the car so I can have a better idea if what it's doing.

'95 Cougar - 2002 Explorer engine, 2004 Mustang PTP2 PCM

Best times:
PI 4.6L 95 XR7 Cougar: [email protected]
2004.5 Silverado Crew Cab/Long Bed/4x4 6.6L Duramax: [email protected] (Weighing in at over 7200#) on 10/19/2007
Dyno - 446.4RWHP/820.2RWTq on 6/13/2008
Pulling - 300.9' 3rd place finish 8/2011
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post #5 of 7 (permalink) Old 07-07-2005, 09:01 AM
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I could be wrong Alan, but wouldn't a broken accumulator spring not effect the shift with exception of the harshness? If the accumulator body was cracked it would effect the shift yes - but if the spring is gone or broke it should only give harsh shifts not effect shift timming? Am i wrong?

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post #6 of 7 (permalink) Old 07-07-2005, 10:34 AM
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Quote:
Originally Posted by SilverFox
I could be wrong Alan, but wouldn't a broken accumulator spring not effect the shift with exception of the harshness? If the accumulator body was cracked it would effect the shift yes - but if the spring is gone or broke it should only give harsh shifts not effect shift timming? Am i wrong?
When the springs break they can jam in the bore. Usually when this happens the case becomes junk.

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post #7 of 7 (permalink) Old 07-07-2005, 10:44 AM
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Oh...so then it creates a leak because it is jammed cokeyed in there? That would make sense, but just missing or brloken spring should not cause drivability issues right?

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