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post #1 of 15 (permalink) Old 05-05-2004, 06:05 PM Thread Starter
 
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Trans Jolt

I've got about 95k on my engine/trans and this just started happening... when the car is in low-rpm's (under 1500) in 3rd or OD and I give it some gas the car jolts as if it wants to shift but it doesn't. If I lean into the pedal a bit more it finally shifts and it's on its way. I plan on doing the full-boat J-Mod sometime soon. Will that help? All the fluids are fine. Also with the J-mod can you shift like a "manumatic" without breaking other things?
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post #2 of 15 (permalink) Old 05-05-2004, 09:46 PM
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looks like transmission shudder to me....mine does the same thing. even after jmod and mercon v. will replace my torque converter soon.

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post #3 of 15 (permalink) Old 05-06-2004, 12:21 PM
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That's your torque converter clutch shuddering.
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post #4 of 15 (permalink) Old 05-06-2004, 12:25 PM Thread Starter
 
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So if I go through the trouble of replacing the TC, I should be able to put one with a higher stall with the J-mod and a mostly stock motor?

~edit~ it's kind of hard to describe, like an err um jolt. Almost powerful enough to throw you back in the chair as if you floored it and then jammed on the brakes. But not quite that bad. Like the tranny is struggling to upshift but can't quite catch the gear.

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post #5 of 15 (permalink) Old 05-06-2004, 12:57 PM
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I'm not sure what your are describing is shudder or not. It could be at the RPM level and gear you are talking about but shudder feels like you are driving over a rumble strip or washboard for a few seconds. Is that what your jolt is? A merc V swap will usually stop shudder without the need to replace the TC

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post #6 of 15 (permalink) Old 05-06-2004, 10:03 PM
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Quote:
Originally posted by timb
I'm not sure what your are describing is shudder or not. It could be at the RPM level and gear you are talking about but shudder feels like you are driving over a rumble strip or washboard for a few seconds. Is that what your jolt is? A merc V swap will usually stop shudder without the need to replace the TC
mine didn't.....

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post #7 of 15 (permalink) Old 05-07-2004, 12:35 PM
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TCC shudder feels like a misfire, like a cylinder is cutting out for a second or so. the Merc V swap will cure if for a little while, but the ultimate solution is to replace the torque converter.
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post #8 of 15 (permalink) Old 05-07-2004, 01:33 PM
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I'm not trying to stir up trouble but replacing the torque converter is not always the ultimate solution. The reason I say this is because a brand new torque converter will still shudder if your fluid is burnt. I do agree that converters were redesigned in 96 to overcome some design issues with the 94-95's but if the converter was the only issue Ford would have never invented MercV and issued a TSB for it's use.

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post #9 of 15 (permalink) Old 05-08-2004, 12:57 AM
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isn't changing new tc always required new fluid as well?

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post #10 of 15 (permalink) Old 05-08-2004, 12:08 PM
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Yes of course it does. My point was that the torque converter isn't the ultimate solution for curring shudder it is just one of the things that can cause it. When the fluid breaks down the lockup plates slip on each other causing the shudder during lock up. You can have good plates but bad fluid and have shudder so to say to someone who may only need to change his fluid that the converter is the only REAL fix is false and could cost someone money they don't need to spend

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post #11 of 15 (permalink) Old 05-09-2004, 10:33 AM Thread Starter
 
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So you can just add this mercon stuff to your tranny without draining the old stuff? I'm guessing you can get it at an auto parts store.
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post #12 of 15 (permalink) Old 05-10-2004, 02:49 PM
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Mine does something similar, ever since I put in my chip. I think its because it locks the TC while cruising. I have brand new mercon V fluid and im hella pissed that there is no drain plug on my Mark VIII TC.
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post #13 of 15 (permalink) Old 05-10-2004, 03:30 PM
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Quote:
Originally posted by SVT Sleeper
So you can just add this mercon stuff to your tranny without draining the old stuff? I'm guessing you can get it at an auto parts store.
No you need to drain the trans fluid and refil with Mercon V (mercV is a kind of trans fluid)

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post #14 of 15 (permalink) Old 05-10-2004, 09:14 PM
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I've seen some Mercon V additive for regular Mercon fluid that's supposed to make it behave like Mercon V. You wouldn't have to drain for that stuff. However, I don't know how well that stuff works and I'm reluctant to trust such additives, so I would recommend actual Mercon V oil over it.

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post #15 of 15 (permalink) Old 05-10-2004, 09:16 PM
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By the way, when my fluid got old, my torque converter started cutting out terribly, about like you're talking about. I planned on putting in a new valve body in a week or two, so I just replaced about half the Mercon with regular Mercon and it reverted back to the subtle shudder. So it can definately start jerking.

1994 Thunderbird LX 232
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1989 Thunderbird SC 5-speed
ESM ported supercharger. Performance exhaust.

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