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Discussion Starter · #1 ·
Hello, I'm new to the forum. I'm building a 1934 Chevy and I'm having trouble with the 4L60 transmission, it won't shift. I called the wiring harness folks since I was unable to get any reading from the scanner. They had me check my wiring harness to see if it was a 4 or 5 prong. I left them a message weeks ago that it was a 5 prong.

Is there anything I can be checking to see why it won't shift?
 

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ddjd said:
Hello, I'm new to the forum. I'm building a 1934 Chevy and I'm having trouble with the 4L60 transmission, it won't shift. I called the wiring harness folks since I was unable to get any reading from the scanner. They had me check my wiring harness to see if it was a 4 or 5 prong. I left them a message weeks ago that it was a 5 prong.

Is there anything I can be checking to see why it won't shift?

Since you say 5 prong connector.... this would be on the drivers side? just behind the shifter linkage hookup?

If 'yes' . the wires have nothing to do with shifting on the trans.

Does this trans have a TV cable to the carb?

I'd check the TV cable hookup.... if the minimum setting is not enough the trans could go into a 'fail safe mode' and not up shift till high road speed/RPM

Governor gear could be broken.

What is the histroy on the trans? Fresh rebuild? Known good unit?

Junk yard unit?

:cool:
 

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Discussion Starter · #3 ·
The plug I was talking about was the ALDL plug (scanner).

What I need to know is what keeps the transmission from shifting. It moves under its own power it just don't shift.

The transmission came with the engine and had only 11,000 miles on it.
 

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ddjd said:
The plug I was talking about was the ALDL plug (scanner).

What I need to know is what keeps the transmission from shifting. It moves under its own power it just don't shift.

The transmission came with the engine and had only 11,000 miles on it.
OK.... so is this a 4L60E tranny or what is it?

what year is the power train? What engine size? What vehicle was the power train from?

What is the ECM ( OEM or aftermarket) controlling stuff if it an electronic trans and engine

More info please.
 

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Discussion Starter · #5 · (Edited)
4L60E Transmission won't shift

It is a 1996 LT1 Motor combo that came out of the same car. The transmission is controlled by the computer (ECM). I bought a brand new computer and had Street and Performance program it to my application.

It moves in reverse fine, moves forward fine but won't shift into 2nd.
 

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ddjd said:
It is a 1996 LT1 Motor combo that came out of the same car. The transmission is controlled by the computer (ECM). I bought a brand new computer and had Street and Performance program it to my application.

It moves in reverse fine, moves forward fine but won't shift into 2nd.
OK..... thanks for the update.

there are control boxes that can be plugged into the 4L60E trans to test it's functions. Shaffer Shifter is a brand name of box... there are also other break out type boxes for such tests.

the Shaffer shifter will operate the trans separate from your ECM to verify if the trans is good and follows the electronic commands.

Since your trans does not shift at all...... the ECM must be checked / scanned for what data it is receiving.

Since you posted that a scanner was unable to retrieve the data. I ask :" what type of scanner was used?" A quality scanner with the proper software to link to the ECM must be used.

Since you received no response from the vendor yet, I would start calling till you get a human that can provide answers for your problem.

Do you have a speed sensor on the trans that feeds the ECM? What design? Gear driven or the metal disc ( reluctor) on the out put shaft?

The ECM must have proper data input to operate/shift the trans.

photo below shows parts I am speaking about. Sensors ( 2 designs) and the reluctor wheel/disc.

 

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Are you using the factory harness or aftermarket?

When I installed my lt1 and 4l60e it wouldn't shift either. I finally found that the grey wire from the tps wasn't hooked up. Works now. (I made my own harness) missed 1 wire. Not bad!

Also make sure you have power going to the trans.
 
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