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post #1 of 10 (permalink) Old 10-12-07, 09:12 PM Thread Starter
rvguy
 
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Trans jerking at 40mph?

Seems to be searching for OD or 3rd, and like a picky biotch, can't make up her mind!

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post #2 of 10 (permalink) Old 10-13-07, 07:23 AM
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Re: Trans jerking at 40mph?

Rvguy,

Does it do it all the time or just when you first start out (cold?) My transmission is slightly jerky when cold but when it warms up a bit it goes away.
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post #3 of 10 (permalink) Old 10-13-07, 08:22 AM
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Re: Trans jerking at 40mph?

have you changed your trans fluid lately? my GM was shuddering when going into overdrive. had the fluid changed and shudder was gone.
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post #4 of 10 (permalink) Old 10-13-07, 09:35 AM Thread Starter
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Re: Trans jerking at 40mph?

Happens all the time, it is about 30,000 miles since the trans fluid was changed. Will change it, but this has been a problem since I've owned the car. Bought at 40,000 miles, 71,000 now.
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post #5 of 10 (permalink) Old 10-15-07, 08:06 PM
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Re: Trans jerking at 40mph?

I'm gonna guess it's related to the torque converter locking and unlocking for some reason...not sure what would cause that, but that's kinda what it sounds like.


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post #6 of 10 (permalink) Old 12-04-07, 08:05 PM
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Re: Trans jerking at 40mph?

replace all trans fluid including torque converter. A lube-gard product called Dr. Tranny fixed my 95 mgm. get it ai napa.
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post #7 of 10 (permalink) Old 12-05-07, 06:00 AM
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Re: Trans jerking at 40mph?

It's torque converter shudder....notorious on these cars. Tranny flush, including draining the torque converter. Fill to spec with MERCON V only.

My Fords:
'98 Crown Vic LX
-167k miles and counting. Still used as daily driver.

'99 Crown Vic Police Interceptor
-Completed full PI swap
-Marauder Airbox & 80mm MAF
-'04 CVPI Ziptube
-ADTR ported plenum
-Steeda Intake Spacer
-BOC tune
-J-Mod tranny
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post #8 of 10 (permalink) Old 12-10-07, 06:09 PM
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Re: Trans jerking at 40mph?

You can also do a flush & fill with synthetic transmission fluid. It flows better in all weather. I run Amsoil ATF in my '99 Taurus and it shifts like its brand new. Installed it at 65 000miles. Amsoil is Mercon V compatible and is warranted for 50 000miles of severe service.

'11 Ram Quad Cab 4x4 SXT 5.7L HEMI (stock); 48,500m
'06 Pontiac G6 GT 3.5L 220hp; 64,000m
'12 Chrysler 200 Limited 3.6L 283hp; 28,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!
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post #9 of 10 (permalink) Old 12-20-07, 05:47 PM
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Re: Trans jerking at 40mph?

Sometimes this is caused by the modulator valve failing to seat properly. Friends CV had the same problem and he took it to a tranny shop. They replaced the modulator assembly and all the problems are adios muchachos!
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post #10 of 10 (permalink) Old 12-20-07, 06:16 PM
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Re: Trans jerking at 40mph?

Quote:
Originally Posted by dryelf327
It's torque converter shudder....notorious on these cars. Tranny flush, including draining the torque converter. Fill to spec with MERCON V only.

This is the easiest and most common fix for this problem. As Dry said, use only spec Mercon, that is critical.
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