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#2553377 - 07/03/12 04:16 PM Car slows down rapidly/worn transmission?
maxknox Offline
Always thinking about Donald Duck Dunn
Over the Hill

Registered: 09/24/08
Posts: 3460
Loc: Euclid, Ohio
Couldn't turn up any results trying to find a similar issue so here's a question.
Anyone out there ever notice their car slowing down, most noticeably at freeway speeds, faster than it should?
I've noticed that since I had a j-mod(but not a full transmission flush) the car seems to slow down a bit too quickly when cruising at highway(55-70mph) speeds.
Immediately after my j-mod I noticed some transmission flutter when coasting at near cruising speeds. It felt like the car was try to slow itself way down. This has completely gone away. Still, I notice the car seems like it's dragging when I take my foot off the gas at higher speeds. I'm not carrying around extreme weight and I haven't used the car to tow anything ever.

My thought is that it's my torque converter but I don't even know if that would cause this. Any suggestions?
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#2553417 - 07/03/12 06:08 PM Re: Car slows down rapidly/worn transmission? [Re: maxknox]
P71Ham Offline
Climber

Registered: 11/18/08
Posts: 650
Loc: Parkersburg, WV
Have you checked your bearings? A buddy of mine's truck did that before we replaced the bearings.
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#2553437 - 07/03/12 06:53 PM Re: Car slows down rapidly/worn transmission? [Re: maxknox]
Dan04Merc Offline
Member

Registered: 11/15/09
Posts: 374
Loc: CT
Are you sure it is in overdrive when you are driving at highway speeds?
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#2553450 - 07/03/12 07:14 PM Re: Car slows down rapidly/worn transmission? [Re: maxknox]
Jeff_from_jeffco Offline
Climber

Registered: 08/11/11
Posts: 538
Loc: Mo, jefferson country
mine does the same thing and has with 3 different torque converters i stopped chasing the problem and just kept my foot on the pedal :/ im sure it has something to do with clearances etc but i cba to find it when working 13 hour days lol and im rebuilding a trans from the ground up and j-modding before install so i'll let you know if i feel a difference.
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#2553543 - 07/03/12 10:20 PM Re: Car slows down rapidly/worn transmission? [Re: maxknox]
TechnoWeenie Offline
Banned
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Registered: 10/02/04
Posts: 22857
Loc: The perimeter
calipers not releasing, axle bearing, and rear end, in that order.
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#2553553 - 07/03/12 10:30 PM Re: Car slows down rapidly/worn transmission? [Re: maxknox]
thedanned Offline
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Registered: 05/30/09
Posts: 2833
Loc: Albuquerque New Mexico
Jeff might be on to something. If your torque convertor clutch is not releasing when you let off the gas it would do this. To check for this tap the brake pedal when it is slowing to release the clutch.
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#2553557 - 07/03/12 10:37 PM Re: Car slows down rapidly/worn transmission? [Re: maxknox]
Crown2Victorious Offline
Member

Registered: 05/24/11
Posts: 343
Loc: La La land
Next time you go to slow down and you want to eliminate the trans as the "culprit" just pop it in neutral. See if still does it.
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#2553919 - 07/04/12 04:23 PM Re: Car slows down rapidly/worn transmission? [Re: maxknox]
maxknox Offline
Always thinking about Donald Duck Dunn
Over the Hill

Registered: 09/24/08
Posts: 3460
Loc: Euclid, Ohio
I'll probably start by popping it into neutral. I assume that if the car stops slowing down in neutral that it's probably the trans?
I'll try tapping the brake too, I didn't realize that would do anything. Hopefully this doesn't get too deep.
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Originally Posted By Moby_Vic
It's not my fault you're all a bunch of soft pansies.

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#2553921 - 07/04/12 04:24 PM Re: Car slows down rapidly/worn transmission? [Re: maxknox]
maxknox Offline
Always thinking about Donald Duck Dunn
Over the Hill

Registered: 09/24/08
Posts: 3460
Loc: Euclid, Ohio
And just to be clear, it doesn't feel like I'm jabbing the brake as soon as I let off the gas, but it's noticeable enough that I do feel myself go forward for sitting in my seat.
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Originally Posted By Moby_Vic
It's not my fault you're all a bunch of soft pansies.

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#2553924 - 07/04/12 04:26 PM Re: Car slows down rapidly/worn transmission? [Re: maxknox]
maxknox Offline
Always thinking about Donald Duck Dunn
Over the Hill

Registered: 09/24/08
Posts: 3460
Loc: Euclid, Ohio
And the main reason I ask is because I drive over 95% highway and still only squeeze 21-22mpg avg.
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Originally Posted By Moby_Vic
It's not my fault you're all a bunch of soft pansies.

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#2553932 - 07/04/12 04:49 PM Re: Car slows down rapidly/worn transmission? [Re: maxknox]
GrandMarq9807 Offline
Over the Hill

Registered: 05/10/10
Posts: 4420
Loc: Virginia
With that MPG and symptom, are you sure it's shifting into O/D??

If acceleration is normal, I doubt there is a issue other than maybe no O/D...
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#2554002 - 07/04/12 07:29 PM Re: Car slows down rapidly/worn transmission? [Re: maxknox]
TechnoWeenie Offline
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Registered: 10/02/04
Posts: 22857
Loc: The perimeter
count the shifts.


On a GS with 2.73, should be in OD right around 40... With those gears, I could be going 60, let off the gas, and it'd take me a good 10-15 seconds to drop to 50....

If you had a ridiculously high gear, then I could see it... But 2.73s ARE 'highway cruising gears'.
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#2554455 - 07/05/12 04:32 PM Re: Car slows down rapidly/worn transmission? [Re: maxknox]
D-Fenz Offline

Poobah

Registered: 10/23/03
Posts: 6686
Loc: Free America (WV)
I'd be suspicious of the axles/bearings personally. 03-early 05 were apparently troublesome.
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#2555544 - 07/07/12 07:15 PM Re: Car slows down rapidly/worn transmission? [Re: maxknox]
maxknox Offline
Always thinking about Donald Duck Dunn
Over the Hill

Registered: 09/24/08
Posts: 3460
Loc: Euclid, Ohio
Definitely shifts into O/D(assuming that an indicator is if I hit the O/D button and it shifts down, but I'll count to be sure). And I definitely have a shift at 40.(car does have 2.73s)
Tried tapping the brakes, no difference there.
If I'm at 70, it's ten seconds on a good day to coast down to 50 on flat pavement.
60-50 is probably 6-7 seconds.
I'll add axles and bearings to my to-do list.
Recently with this hot weather I haven't wanted to do much of anything, plus the heat is making the car idle pretty rough when it gets up to operating temp(which doesn't take long when it's 90 plus out).

Thanks for all the suggestions.
_________________________
Originally Posted By Moby_Vic
It's not my fault you're all a bunch of soft pansies.

_________________________________________________

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#2555547 - 07/07/12 07:18 PM Re: Car slows down rapidly/worn transmission? [Re: maxknox]
maxknox Offline
Always thinking about Donald Duck Dunn
Over the Hill

Registered: 09/24/08
Posts: 3460
Loc: Euclid, Ohio
The FIRST thing I've done is probably the easiest which has been to change my driving habits(I'm sure I'm not the first to admit just how hard that is). Basically no more green light launches(I don't chirp the tires or anything to begin with) and no more flooring it on the freeway unless completely necessary... also less hard-braking, and I've always ALWAYS tried to avoid hitting my brakes above 55 mph and just let the car slow itself down when I need to.
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Originally Posted By Moby_Vic
It's not my fault you're all a bunch of soft pansies.

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