1st to 2nd shift issue - TCCoA Forums
 
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post #1 of 11 (permalink) Old 09-01-2014, 12:15 PM Thread Starter
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1st to 2nd shift issue

first its a 95 tbird 4.6 has 4.10 gears , jmod,and exhaust. every once in a while when it goes to shift from 1 to 2 it acts like it hangs up part way between gears. it did this also with the stock 3.08 gears. will do it if in auto or manually shifting at part throttle it usually acts fine. doesnt do it all the time. any ideas what may be causing it???
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post #2 of 11 (permalink) Old 09-01-2014, 02:24 PM
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Is it a pause, or a shudder?

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post #3 of 11 (permalink) Old 09-01-2014, 03:08 PM Thread Starter
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its like you feel it shift but it wont fully engage till you let off
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post #4 of 11 (permalink) Old 09-01-2014, 03:13 PM
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Sounds like an accumulator spring.

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post #5 of 11 (permalink) Old 09-01-2014, 03:35 PM Thread Starter
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when i did the jmod i removed the springs when i replaced the pistons
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post #6 of 11 (permalink) Old 09-03-2014, 11:21 PM Thread Starter
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bump anyone?
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post #7 of 11 (permalink) Old 09-04-2014, 05:49 PM
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Could be a toasted Roller Clutch.

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post #8 of 11 (permalink) Old 09-04-2014, 08:16 PM Thread Starter
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i have started paying more attention to it the last few days doesnt do it when the trans is cold only after it has gotten hot from driving
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post #9 of 11 (permalink) Old 09-04-2014, 10:04 PM
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Did this problem occur before the j mod, and/or accumulator piston change?

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post #10 of 11 (permalink) Old 09-04-2014, 10:07 PM Thread Starter
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after i believe
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post #11 of 11 (permalink) Old 09-04-2014, 10:57 PM
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If after it leads me to believe something went wrong with the j mod procedure.

If you are confident all the holes in the separator plate were drill in the right location, and to the right size. And all the check balls are there, and in the right place, the separator plate(s) may be warping upon temp. increase causing too high throttle pressure.

I'm inclined to suggest re-torquing the valve body with a known calibrated torque wrench in the proper sequence.

Another is a sticking/leaking accumulator piston. IIRC, you may want to try re-installing the bottom spring.

That's a simple thing to do, hence why I make these suggestions first.

Other things that come to mind not j mod related:
Sticking 1-2 shift valve.
Bad pressure regulator valve/bore. Ever hear any buzzing sound when it's hot?
Sticking/stuck/gummed up clutch drum check ball.

Any runaway rpm's during the shift?
CEL off?

Checking transmission pressures with gauges, and duplicating the complaint, might give clues.

1995 Thunderbird LX 4.6l 97 Headlamps/Hood All Red Tails Muffler/Resonator Delete
2004 Tahoe 5.3 4x4
2008 Acadia Limited AWD

...still looking for a clean, low mileage, rust free 96/97 Thunderbird 4.6
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