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post #1 of 8 (permalink) Old 10-12-09, 01:37 PM Thread Starter
1993 Grand Marquis owner
 
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1993 GM vibrations/rumbles shifting into 4th

vibrations might not be a strong enough word... as the title says, when i am accelerating and the car shifts into 4th, it feels like i am driving over a rumble strip. you can feel it through the whole car. sometimes it kind of feels like there is also a slight power dip while the rumbling is happening. i also get some similar sensations when it downshifts into 4th.

does anybody have any insights that go any deeper than "your 4th gear is chewed up"? is there anything i can do short of bringing it to a transmission place? though it is a 1993, the car has just under 70k on it, so i'd really like to keep driving it.

thanks everybody.

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post #2 of 8 (permalink) Old 10-12-09, 06:55 PM
Junior Herb
 
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Re: 1993 GM vibrations/rumbles shifting into 4th

Have you ever had the transmission filter changed?
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post #3 of 8 (permalink) Old 10-12-09, 07:31 PM
2002 F150 XLT
 
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Re: 1993 GM vibrations/rumbles shifting into 4th

The 93 had a plug in the torque convertor so with the filter, it uses about 10½ qts of fluid.
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post #4 of 8 (permalink) Old 10-12-09, 09:45 PM
Junior Herb
 
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Re: 1993 GM vibrations/rumbles shifting into 4th

Without draining the torque convertor it would be around 6 quarts?
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post #5 of 8 (permalink) Old 10-12-09, 10:02 PM
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Re: 1993 GM vibrations/rumbles shifting into 4th

About 4½ qts.
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post #6 of 8 (permalink) Old 10-12-09, 10:43 PM
Junior Herb
 
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Re: 1993 GM vibrations/rumbles shifting into 4th

oh, okay. The converter holds that much?! It doesn't look to be that big.
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post #7 of 8 (permalink) Old 10-13-09, 09:05 AM
2002 F150 XLT
 
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Re: 1993 GM vibrations/rumbles shifting into 4th

It definetly does. I've done hundreds of the services. Our fleet didn't have that many cars but we serviced them every 30,000 miles.
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post #8 of 8 (permalink) Old 10-15-09, 08:10 AM Thread Starter
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Re: 1993 GM vibrations/rumbles shifting into 4th

thanks for the responses. i'll look into the transmission filter and i'll report back to let you know how it works out.
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