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Old 11-02-2003, 10:42 PM   #1
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Default Please read. Tranny problems with a newer tranny?

I have a few questions within this post so please bear with me.

I never really payed too much attention to it, but today I decided to. On my transmission there is a sticker that says: "*ervice Replacement Transmission Assembly" and "Remanufactured for General Motors Corp"

This obviously sounds to me like it has been rebuilt, or at least is not 100% original, right? Don't ask me why I didn't pay attention to this before but I bought the car 8/31/01 with 95K miles. Isn't that generally a little low miles for these trannies to go bad and have to replace/rebuild it? I would think so.

So assuming, (hypothetically) it has been rebuilt within the past 3 years lets say (roughly 32,000 miles ago...22,800 from me) I shouldn't have to worry about tranny problems (I'd hope). Here comes the questions:

1.) On the highway the past few times I've been on long trips, I'd be holding at 70-72mph, sometimes with cruise on, sometimes not, I'd get this feeling that it was shifting AS I was holding a steady speed. I'd feel the power kind of cut out, then immediately I'd hear and feel it hit hard into gear.

When it did this I was only at 70-72, and it ONLY happened when I was pretty low on gas as well. Does anyone think this is a tranny problem or something else? I'd be surprised I was having tranny problems with a newer tranny.

2. Also, if the tranny was rebuilt or replaced, would the lower tranny lines be new too? I was reading the post on the recall notice about the tranny lines blowing apart and causing fires. I looked at my tranny lines today and didn't see any rubber crimps in them that were the cause of that problem.

3. Assuming it'* a rebuilt tranny, is it common for things to go wrong with rebuilt trannies at 30,000 miles or so? Well if they were rebuilt wrong I suppose so but has anyone experienced problems with rebuilt trannies?

Thanks for reading. Any and all help is appreciated. Thanks doods.
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Old 11-03-2003, 02:00 AM   #2
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You need to try to duplicate that again. And watch your rpm'* when or if it does it. GM rebuilt tranny'* are the safest route to go. Much better than a locally rebuilt or repaired trans. These are sortof black magic, so a gm rebuild to factory specs is the best.

Another great thing to do if you're worried, is to get a scantool and see how much slip you have in TC lockup. My scantool told me I was having a prob in this area....so I got a flush. Fixed the prob.

So basically, try to duplicate it, get a scantool on it while driving, and maybe get a flush if you see any indications.......wait....didn't you just get a flush? How long since the pan filter was changed?
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Old 11-03-2003, 02:02 AM   #3
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Could it just be the TC kicking in and out? Adjusting his speed (since he mentioned cruise) for road grades?

Just my guess, as I know nothing about trannies.
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Old 11-03-2003, 02:07 AM   #4
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Trannies are people who dress......oh, never mind.

I'm betting he knows when to expect the TC to lockup, so I'm once again assuming that this is an extra 'bump'. The trick is to get it to do it again. Might not do it cold though, so get it good and warmed up first.
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Old 11-03-2003, 02:17 AM   #5
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Well I noticed a while back at 40-45mph it would do something similar, and I figured THAT was TC lockup...but the first time I've noticed it happening at 70-72 was on my way home from the Aug. 30th Bonne meet...I was painfully low on gas and had the cruise set at 70. It would seem to cut out and then hit pretty hard back into gear.

When I was at 40-45 it wouldn't hit hard into gear, it would just kind if surge and make a weird noise if I didn't hit the gas an shift up. The weird thing is I've only noticed this happening at 70-72 when my gas gauge was right around the orange "Check Gauges" level.

On my way home from Binghamton this past Saturday I actually tried to duplicate this. But I filled my tank 1/2 way to see if it was related to gas being low. I set cruise at 73mph, occasionally it would drop to 71, 70, but it NEVER happened again for the whole 80 mile trip. I couldn't explain it. I'll try to duplicate it when I run low on gas again.

Will, I haven't gotten a flush yet. This month I will get it done, hopefully when I get my oil changed within a couple weeks. I have no idea when it was done last, but I KNOW it hasn't been done since I've had the car which has been about 23,000 miles now (the fluid is a nice reddish color though)

I just wish I knew when the tranny was rebuilt. I wonder why it went before 100K miles. I know the previous owner'* name. I'll give him a call.
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Old 11-03-2003, 02:26 AM   #6
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Will, I'll get a flush anyway, since it'* cheaper than a scantool and I'm broke but do you think it could be a problem with the cruise control itself? It'* probably a stretch, and hard to know without a scantool what it is, but my cruise control hasn't been working properly for a while now. I can never get it to work at speeds below 70-75 roughly. Hard to explain, but if I try to set it at 65 it will never hold there. I was surprised I got it to set at 73 Saturday.

Actually the more I think about it I doubt it'* a cruise control problem that'* another topic.


EDIT: Ya, hold on, it can't be the cruise control since at 70-72 this thing happens even when NOT in cruise control. I just remembered that. You can forget I mentioned it
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Old 11-03-2003, 02:33 AM   #7
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Your prob sounds like it MIGHT be fuel related, but just keep an eye on it. Your cruise sounds like it may be a vacuum related prob.....a leak somewhere. It'* not producing enough manifold vacuum to hold cruise at the lower rpm'*, but when you're gettin' it at the higher speeds, it does. I'd replace some vacuum lines in the vicinity of the cruise modulator if I were you. Just a guess. That'* where I'd start.
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Old 11-03-2003, 02:44 AM   #8
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Where would the cruise modulator be/the vacuum lines I mean? (It'* late and I'm lazy )

Also, I forgot to mention, cruise DOES work at 30-40mph too. When I go 60-65 I can never get it to hold. I can get it to hold above 75 and above 85 virtually all the time though. Could the 15 AMP fuse for the cruise control be bad too?

I'll keep an eye on it. In the meantime I'll get a flush ASAP and try to duplicate it tomorrow and at the end of this week when I'm low on gas again.
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