revving during 3-4 shift 4r70w - TCCoA Forums
 
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post #1 of 11 (permalink) Old 06-09-2005, 08:29 PM Thread Starter
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revving during 3-4 shift 4r70w

hi, i have a 3500rpm stall edge converter, with a PA valve body.
when i'm driving, the 3-4 shift always revs a little, about 500rpm. this is barely on the throttle. if i turn OD off and on, sometimes it will rev, sometimes it wont.
is this a major problem, or should can the chip fix this?
btw, never WOT'd the car yet, hasn't been on the dyno yet.

also, a little off topic, should the line pressure be raised even though i have the valve body?
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post #2 of 11 (permalink) Old 06-09-2005, 10:52 PM
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I suggest you make sure you have the large OD servo and it would be a good idea to change the OD band. They are always fried. If that doesn't fix it put the stock converter back in because it has a better clutch.
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post #3 of 11 (permalink) Old 06-10-2005, 12:24 PM Thread Starter
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hm.. well.. it drove completely fine when i didn't have the converter or the valve body. it's too bad i put them in at the same time.
i'll probably do the OD servo, j-mod springs and accumulators while i'm at it, as i think PA only supplied the 1-2 and 2-3 servo springs.
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post #4 of 11 (permalink) Old 06-10-2005, 12:30 PM
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I suggest you read A-train's articles on the J-mod if you're replacing the OD servo - they are tricky to get in place right. If you get it wrong, you'll have to do it all over again.

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post #5 of 11 (permalink) Old 06-10-2005, 12:42 PM Thread Starter
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ok, thanks!
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post #6 of 11 (permalink) Old 06-10-2005, 01:32 PM
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Try this. After the 3-4 shift completes, keep the throttle steady and just tap the brake pedal enough to activate the brake lights, the converter will unlock then relock. If this feels exactly like what you are already feeling, then it's your calibration and/or the inability of that converter clutch to lock, you're feeling the converter clutch modulation for the upshift. If it feels different, then yes your OD band is slipping.
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post #7 of 11 (permalink) Old 06-10-2005, 02:22 PM Thread Starter
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so basically, holding it in OD at constant throttle, then tapping the brake should cause the engine to rev slightly (-IF- the OD band is good)?
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post #8 of 11 (permalink) Old 06-10-2005, 03:26 PM
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Quote:
Originally Posted by xomp
so basically, holding it in OD at constant throttle, then tapping the brake should cause the engine to rev slightly (-IF- the OD band is good)?
Tapping the brakes unlocks the torque converter, and allows the RPMs to jump a little. Kdanner is saying that when you do this, does it feel the same as on the 3-4 shift? If so, it might not be the OD band; it might be the program or the converter clutch. If it feels different, it's probably the OD band.
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post #9 of 11 (permalink) Old 06-10-2005, 04:44 PM
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Quote:
Originally Posted by Tobey
Tapping the brakes unlocks the torque converter, and allows the RPMs to jump a little. Kdanner is saying that when you do this, does it feel the same as on the 3-4 shift? If so, it might not be the OD band; it might be the program or the converter clutch. If it feels different, it's probably the OD band.
That's exactly what he said.
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post #10 of 11 (permalink) Old 06-10-2005, 04:53 PM Thread Starter
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ok, just wanted to clarify.
damn, you guy's are all over this.

thanks a lot for the help, i'll give it a try when i get back from work.
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post #11 of 11 (permalink) Old 06-11-2005, 07:56 PM Thread Starter
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hm.. well tried it like 10 times.
I'm not sure if i'm doing it right, but when i pushed the brake while in OD, I don't feel anything, seems to drive normally.

could it be the valve body and would it be a good idea to do the jmod/servo? i don't wanna waste my time if the band is probably dead.
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