Transmission Questions

[happydog500]

I had to replace my motor, when I got a new one, I found my transmission was slipping. I could go slow, but if I really push it, it would slip.
After months of not driving (went out almost completely), I replaced the trans with a "Good" "low mile" "101,000" one.

I payed a lot to have it put in, only to find it also slipped. The person at the trans shop told me these trans are not very good. He's had then come in shot, with 50,000, and one with 40,000. (I know there are lots out there with hundreds of thousands, so you don't need to respond with your mileage).

He said something about second gear clutch being a weak point in these (I think that's what he said).
He told me that to get a trans and, fix whats the weak point, it's about $2,600.
How hard is it to replace a clutch, or whatever it is that makes it slip? What is it that needs to be done?
Is there anyway to know, or have any idea if a trans is good if you get a used one?

Thank you,
Chris.

[enslow]

I would first try dropping the pan, change the filter, refill. Then put a tube of Dr Tranny Instant shudder fix, then go from there. I personally haven't heard of the clutch being a common problem, although I've heard of issues with the lockup torque converter.

[MagicRat]

Good advice.
Over many years and many cars, I have found a fluid and filter change fixes auto trans problems about half the time. Don't substitute a flush. You need to drop the pan, clean it out and change that filter.

[happydog500]

Originally Posted by MagicRat

Good advice.
Over many years and many cars, I have found a fluid and filter change fixes auto trans problems about half the time. Don't substitute a flush. You need to drop the pan, clean it out and change that filter.

I did a fluid and filter change, with a flush, and dropped the pan and that's when it started slipping.

Thank you for the reply,
Chris.

[enslow]

The flush part may have been your problem. I've heard that doing a flush on older transmissions causes problems. Simple pan drops with a filter change seem ok.

[happydog500]

Originally Posted by enslow

The flush part may have been your problem. I've heard that doing a flush on older transmissions causes problems. Simple pan drops with a filter change seem ok.

Or the transmission was bad, and nothing I would of done would hurt it.
Chris.

[happydog500]

Just got back from the store where the College automotive class was having a fundraiser. They will read the codes and check everything else they can with there big electronics stuff.
I had them read for the transmission codes. They said there is no codes stored.
If the car misfires, it leaves a misfire code. If it runs lean, it leaves a lean code. I was wondering, how can a car transmission slip so much, but yet leave no code?

Chris..

[Tech II]

First of all, If I am putting a used tranny in a vehicle, before it goes in, it is going to be checked.....new axle seals and converter seal is put in....converter will be emptied and after the tranny is in, replace the filter and fluid....

Before the tranny is put in the vehicle, that side cover is going to be pulled(now is the time to do it), and I am going to have all the valves in the valve body checked for movement, and I am going to replace the TCC solenoid and the pressure control solenoid....that's minimum....have seen guys put complete new valve bodies.....

If that tranny is slipping as much as you say it is, there should be a code set....need to drive the vehicle with a scan tool attached and watch tranny data.....check input and output rpms....check transmission slippage....should be under 30 rpms in fourth gear, under a load(like up a grade)...

[happydog500]

Originally Posted by Tech II

Before the tranny is put in the vehicle, that side cover is going to be pulled(now is the time to do it), and I am going to have all the valves in the valve body checked for movement, and I am going to replace the TCC solenoid and the pressure control solenoid....that's minimum....have seen guys put complete new valve bodies.....

Thanks for the reply, If I would of done this, it still would slip because the clutches would not be replaced. Would of been more of a wast then it was.

Chris.

[enslow]

Originally Posted by happydog500

Just got back from the store where the College automotive class was having a fundraiser. They will read the codes and check everything else they can with there big electronics stuff.
I had them read for the transmission codes. They said there is no codes stored.
If the car misfires, it leaves a misfire code. If it runs lean, it leaves a lean code. I was wondering, how can a car transmission slip so much, but yet leave no code?

Chris..

I had a bad misfire a few years ago with no codes set. To set a missfire code, the plug has to miss consecutively a number of times. I had random miss fires. The way I caught them was to hook up a scantool to monitor misses in real time. Not a single code was set, and I could hardly make it up a hill. At the same time, the scantool reported misses at multiple plugs in real time. all I'm saying is it could be plugs, and if it were, you wouldn't be the first to be fooled by an engine miss. I 've heard of pros making the same mistake too. Then again, it could be tranny slip too. Try a scantool with real time data logging or viewing and confirm its not missing.

[Tech II]

Thanks for the reply, If I would of done this, it still would slip because the clutches would not be replaced. Would of been more of a wast then it was.

Of course that is true......that's the chance you take by putting a used tranny in......but by doing what I suggested, it would have eliminated the potential problems with a PCS solenoid and a TCC solenoid, which are known causes for slippage.....can you imagine putting a used tranny in , and then finding out the converter seal is leaking after the fact?

Just trying to alert others about things they should do before installling a used tranny....

[happydog500]

Originally Posted by Tech II

Thanks for the reply, If I would of done this, it still would slip because the clutches would not be replaced. Would of been more of a wast then it was.

Of course that is true......that's the chance you take by putting a used tranny in......but by doing what I suggested, it would have eliminated the potential problems with a PCS solenoid and a TCC solenoid, which are known causes for slippage.....can you imagine putting a used tranny in , and then finding out the converter seal is leaking after the fact?

Just trying to alert others about things they should do before installling a used tranny....

OK, thank you. We did put in the converter seal.
How hard is it to put in the clutches?

[maxwedge]

Replacing the clutches requires a complete disassembly of the trans.

[happydog500]

Originally Posted by maxwedge

Replacing the clutches requires a complete disassembly of the trans.

How come I don't get a trans slip code when my trans slips?

[enslow]

Instead of telling us your transmission is slipping, describe your symptoms. You may not have transmission slip codes if the cause of your symptoms is not from the transmission.

Refer to my previous post. Many transmission slip symptoms are caused by other components that can include ignition, MAF sensors, even engine /transmission mounts.