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Trans lock up

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Old 03-12-2010, 10:05 PM
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Trans lock up

I know this has been discussed before but I can't find the thread. My torque converter wants to lock and unlock between 40-50 mph. Someone said they bought a resistor and it fixed it. I was wondering if anyone had a part number so I could get it installed. Funny part is it didn't start until after Edge J/A was installed, but I hope its a quincidence.
Old 03-13-2010, 08:01 AM
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Originally Posted by diggerfan99
I know this has been discussed before but I can't find the thread. My torque converter wants to lock and unlock between 40-50 mph. Someone said they bought a resistor and it fixed it. I was wondering if anyone had a part number so I could get it installed. Funny part is it didn't start until after Edge J/A was installed, but I hope its a quincidence.
I have always herd that this can be caused by a poor ground off the battery, also I have herd people rapping the alternator line with foil to prevent some sort of feed back, DTT sell a filter to prevent this problem that is what is on my truck, did experience the problem you mention when I test drove a truck that I was looking to purchase. My wife even noticed the problem right away and I was driving. ED
Old 03-13-2010, 10:48 AM
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Start by checking ans cleaning ALL of the ground connections. Then do an APPS reset. Doing those solved my simular problems.
Old 03-13-2010, 12:09 PM
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Funny this should come up again now. I just had a new finding regarding this problem.

I have tried everything - the Sun Coast extra ground, apps reset, cable cleaning and replacing ends on all battery cables. The problem always recurred shortly.

Last week my alternator brush was worn out and sticking and the alternator has been a bit low charging intermittently for a while. Tapping the alternator with a hammer would jar the brush and restore the charging but that was just a temporary fix.

I replaced the alternator - now getting a steady 14.2 or so volt charge and the transmission problem went away - no more constant hunting for lockup in high. Apparently the erratic voltage from the alternator was causing spikes and lack of voltage and shift problems.
Old 03-13-2010, 02:15 PM
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So, having just cleaned both batteries and connections when J/A was installed two weeks ago, should I buy an altenator or the resistor from DTT?
Old 03-13-2010, 09:36 PM
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Also clean the ground cables where there mount to the block and the chassis. And I'd suggest doing the APPS reset. Oh, don't rush out so fast for an alternator. Do all the simple cheap fix's first.
Old 03-13-2010, 10:01 PM
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Could you tell me how to do the APPS reset, I always forget.
Old 03-14-2010, 04:31 PM
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Originally Posted by diggerfan99
Could you tell me how to do the APPS reset, I always forget.
CLICK HERE FOR APPS RESET INSTRUCTIONS



Hope this helps.
Old 03-14-2010, 08:22 PM
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Just check your alternator output - watch the gauge to see that it is consistently at 14.2 or so volts. If intermittent then it may be the cause. Voltage will drop in the mornings when the engine is cold and the heaters come on.
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