Transmission not shifting

[mechgo1977]

I have a 93 4L60E that seems to work ok if shifting it manually but to put it in drive it will not shift. Almost seems like it is slipping, but if I shift it from 1st to 2nd and so on it works other than hesitating from 3rd to 4th.

Any ideas would a be great

[MT-2500]

Originally Posted by mechgo1977

I have a 93 4L60E that seems to work ok if shifting it manually but to put it in drive it will not shift. Almost seems like it is slipping, but if I shift it from 1st to 2nd and so on it works other than hesitating from 3rd to 4th.

Any ideas would a be great

First thing how is fluid and fluid level and fluid condition and filter?
Is engine running good with no engine code?
How many miles on transmission?
Has transmission ever been serviced and what kind of fluid used in it?
Give other repair history engine or transmission or computer system may help

93 up automatic transmissions are computer controlled and computer shifted and need to be put on a transmission/engine capable scanner to test and get codes and read out transmission shift data and slippage and do shift testing built into scanner.
Codes and slippage and shift data tells you a lot about transmission condition.

Parts places OBD11 or OBD1 scanners will not do the job on checking or testing transmission.
Best to find a good repair shop that has the good scanners.

Get it tested on a good transmission scanner and post back any transmission or engine codes and out of spec data.
And answer upper questions.
And then we can help

[serge_saati]

Could also be vehicle speed sensor or transmission speed sensor. Does your speedometer and tachometer works?

Cause it doesn't shift automatically from 1 to 2 but it does it manually.

[MT-2500]

Originally Posted by serge_saati

Could also be vehicle speed sensor or transmission speed sensor. Does your speedometer and tachometer works?

Cause it doesn't shift automatically from 1 to 2 but it does it manually.

Another reason to get it on a scanner.

[mechgo1977]

Originally Posted by MT-2500

First thing how is fluid and fluid level and fluid condition and filter?
Is engine running good with no engine code?
How many miles on transmission?
Has transmission ever been serviced and what kind of fluid used in it?
Give other repair history engine or transmission or computer system may help

93 up automatic transmissions are computer controlled and computer shifted and need to be put on a transmission/engine capable scanner to test and get codes and read out transmission shift data and slippage and do shift testing built into scanner.
Codes and slippage and shift data tells you a lot about transmission condition.

Parts places OBD11 or OBD1 scanners will not do the job on checking or testing transmission.
Best to find a good repair shop that has the good scanners.

Get it tested on a good transmission scanner and post back any transmission or engine codes and out of spec data.
And answer upper questions.
And then we can help

Fluid is fine, engine runs fine no codes there, transmission was rebuild about a year ago and has maybe 5000 miles on the rebuild.
I will try and get a scanner hooked up to see what codes are there.

thanks for the info

[mechgo1977]

Originally Posted by serge_saati

Could also be vehicle speed sensor or transmission speed sensor. Does your speedometer and tachometer works?

Cause it doesn't shift automatically from 1 to 2 but it does it manually.

speedometer and tack work, just replaced the speed sensor and another because it was bad.

thanks

[serge_saati]

Ok, but there's another speed sensor that monitor the input shaft speed of the transmission. If this one is not working/mis aligned, the PCM doesn't know when it should shift in D mode.

When you shift in 2 manually, PCM doesn't care of this sensor.

[transman618]

Originally Posted by serge_saati

Ok, but there's another speed sensor that monitor the input shaft speed of the transmission. If this one is not working/mis aligned, the PCM doesn't know when it should shift in D mode.

When you shift in 2 manually, PCM doesn't care of this sensor.

The 4L60E does not have an input shaft speed sensor. Going to need some more info from the OP. For instance:

When you place the gear selector in "D" and hit the gas, what happens??
When in "D" does the transmission start off in 1st gear and just stay in 1st?? Be totally sure that the transmission is starting in 1st. Is it possible that the transmission is trying to start off in 3rd gear?? That would mean that there could be a problem of 12v getting to the transmission. You can confirm this by checking for 12vdc at the "Pink" wire on the transmission connector. If you have no power to the transmission it wont shift at all, it will stay in 3rd gear (Both shift solenoids off) you will still be able to manually shift by use of the gear selector.


transman

[mechgo1977]

Originally Posted by transman618

The 4L60E does not have an input shaft speed sensor. Going to need some more info from the OP. For instance:

When you place the gear selector in "D" and hit the gas, what happens??
When in "D" does the transmission start off in 1st gear and just stay in 1st?? Be totally sure that the transmission is starting in 1st. Is it possible that the transmission is trying to start off in 3rd gear?? That would mean that there could be a problem of 12v getting to the transmission. You can confirm this by checking for 12vdc at the "Pink" wire on the transmission connector. If you have no power to the transmission it wont shift at all, it will stay in 3rd gear (Both shift solenoids off) you will still be able to manually shift by use of the gear selector.


transman

When it is in "D" it does nothing like it is in neutral. But it will go into reverse and individual gears manually.

[serge_saati]

Ohh, maybe it's just a bad contact in TRS (transmission range sensor). Test this part to see if it's that the problem. Or try moving the shifter up and down a little bit when you're in D. Does the shifter is hard to move?

[mechgo1977]

Originally Posted by serge_saati

Ohh, maybe it's just a bad contact in TRS (transmission range sensor). Test this part to see if it's that the problem. Or try moving the shifter up and down a little bit when you're in D. Does the shifter is hard to move?

that would be a easy fix, where is the TRS at, on the tranny or in the column??

[serge_saati]

Originally Posted by mechgo1977

that would be a easy fix, where is the TRS at, on the tranny or in the column??

In my car, it's above the top of the transmission.
Behind the air filter at driver side. Close to the firewall.

Try also to spray spray contact to the switch to verify that it's the problem.

[transman618]

Originally Posted by mechgo1977

that would be a easy fix, where is the TRS at, on the tranny or in the column??

The range sensor on a 4L60E is bolted to the side of the transmission where the linkages attach to the manual shaft. DO NOT take it apart, they can be checked with a scanner. Your problem sounds more internal like leaking past the sealing rings on the input drum. I would take it back to the builder and see what he says.


transman

[mechgo1977]

Originally Posted by transman618

The range sensor on a 4L60E is bolted to the side of the transmission where the linkages attach to the manual shaft. DO NOT take it apart, they can be checked with a scanner. Your problem sounds more internal like leaking past the sealing rings on the input drum. I would take it back to the builder and see what he says.


transman

This 4L60E does not have a range sensor then, it has the normal linkage at that location. I was going to pull the valve body and double check to make sure that none of the valves were stuck. I would enjoy taking this back to the builder, since I had told them I needed this one completely rebuilt so it would last but they are 800 miles away.

Thanks for the info, would the input drum leaking be the only problem or would the clutches also be bad.

[MT-2500]

Originally Posted by mechgo1977

This 4L60E does not have a range sensor then, it has the normal linkage at that location. I was going to pull the valve body and double check to make sure that none of the valves were stuck. I would enjoy taking this back to the builder, since I had told them I needed this one completely rebuilt so it would last but they are 800 miles away.

Thanks for the info, would the input drum leaking be the only problem or would the clutches also be bad.

It may have normal linkage but if a 4L60E the will be a range sensor on the side where the shift linkage goes in.


But as said in no 2 post.

First thing how is fluid and fluid level and fluid condition and filter?
Is engine running good with no engine code?
How many miles on transmission?
Has transmission ever been serviced and what kind of fluid used in it?
Give other repair history engine or transmission or computer system may help

93 up automatic transmissions are computer controlled and computer shifted and need to be put on a transmission/engine capable scanner to test and get codes and read out transmission shift data and slippage and do shift testing built into scanner.
Codes and slippage and shift data tells you a lot about transmission condition.

Parts places OBD11 or OBD1 scanners will not do the job on checking or testing transmission.
Best to find a good repair shop that has the good scanners.

Get it tested on a good transmission scanner and post back any transmission or engine codes and out of spec data.
And answer upper questions.