strotter13

I am curious if anyone knows whether the ecu connection on my 1992 Corvette 4L60 (not 4L60E) is a 5 pin or 4 pin? I am getting ready to swap it with a rebuilt 4L60, and I want to make sure before I pull the old one, that the connection is the same.

Also, if it is a 5 pin and the new transmission is a 4 pin, or vice versa, is there a work around for this?

Thanks for any help.

WVZR-1

A '92 would be a 5-pin connector and if you've received a transmission with a 4-pin there's substantial probable differences in the valve body likely.

Here's a pin-out of a 5-pin 4L60

http://www.eficonnection.com/eficonn...spx?ItemId=562

Here's a 4-pin from a 700R4

http://www.eficonnection.com/eficonn...spx?ItemId=543

This was the "ship from Florida" buy? You'll need to pull the pan and check. Maybe the connector was used as strictly a "shipping" plug, I would doubt that but anything is possible. You need to check for switches and of course the proper internal wiring.

strotter13

Ok I thought mine was a five pin. I haven't received the new transmission yet. It was delivered to the terminal yesterday, but I am out of town for work, and probably can't pick it up until Friday. I'm hoping it is the 5 pin connector.

So tell me if I have this correct:
4 pin - 3 wires, one to ecm for 4th gear lockup, one to ground and one to brake switch.

5 pin - 3 wires to ecm for 2nd 3rd and 4th gear lockup, one to ground and 1 to brake switch
Is this correct?

Is the only solution to swap out the valve body and plug from my old transmission to the new one, if it is a 4 pin on the new one?

WVZR-1

NO! That is not correct.

4L60 is ECM driver driven for TCC with no similarities to the 700R4 configuration. You need to hope you receive correct product. I believe I'd pull the pan anyway and confirm that the wiring is correct.

strotter13

Can I get some confirmation on this? I thought that the 4 pin connector still had an electronic 4th gear lockup. Thank you for the help.

arbee

This is incorrect information! Around 1986, the 700R4 became ECM controlled for the TCC. 700R4 and 4L60 are one in the same. The difference is in name only, and this change was done around 1990.

WVZR-1

I was using the OP's comment for the 4-pin in his post. I wasn't referencing any particular application specifically.

The OP's comment:

There's still no similarities to the 4-pin & the 5-pin usage, none. I wasn't debating the 700R4 vs. the 4L60 terminology BUT it should have made it much easier for the OP to understand.

strotter13

Ok this information coincides more with what I have been researching. However I believe that 92-93 4l60 has ecm lockup control for 2nd and 3rd gear, rather than just 4th. Hence the 5 pin connector instead of 4 pin. So my question is, if I wire it so that the ecm can lockup 4th gear, and not 2nd or 3rd, how is this going to affect overall operation of the vehicle? Thanks for any help.

arbee

My mistake then. I was only going by your statement :

"4L60 is ECM driver driven for TCC with no similarities to the 700R4 configuration." I am also looking at my 1992 FSM and there six different diagrams showing the valve body wiring - none of them showing a five pin hookup. This may be an error and if so, I would like it pointed out for future use.

strotter13

Ok it looks like I am going to have to pull the transmission and just visually look at the connector to see if it is a round 5 pin or square 4 pin, and go from there. I will keep everyone posted, thank you for all of the help.

arbee

Very simple. Put your car on a hoist or block it up and crawl under it and disconnect the connector. Will answer you question immediately.

strotter13

I tried doing this before I ordered but the linkage was in the way. I sent the guy a picture and he researched, so I'm hoping he got it right. Keeping my fingers crossed. Will at a minimum get the car up and plug unplugged tomorrow. Will post more when I find more. Thanks for all the help.

arbee

If you can't get at the connector, are you able to open the loom and count how many wires there are?

strotter13

That was my exact thought/plan. I will try that.

WVZR-1

I believe that all or most of the '92 transmissions are either YCM or YDM codes. The wiring for those codes are on 7A-20 in the FSM I believe. I've seen the ones that you mention and those are for referencing the entire production run for various years, models etc. The only service connector for a '92 is a 5 pin GM# 8682294 and then later there was a pig-tail part #'d 12102612, earlier ones are considered actually 3 terminal connectors because "one" is actually "plugged" but appears as a four place connector. A, B & D are populated and C is plugged. That's the way I remember it.

OP - In '92 ASR was introduced, unless the vehicle is modified in some unusual fashion I can't understand even thinking about doing it any way other than the "right way" with OE configuration.

strotter13

I agree, why jimmy rig it, and have engine codes and the automobile not working correctly. So it looks like if the transmission that I purchased is a 4 pin/3 wire connector, then I am going to have to figure out what to do next. As soon as I know either way, I will post for suggestions on how to follow.... Thanks again for all of the help.

arbee

I see the schematic now. Thanks. I have never had a 5 pin 4L60 apart - only 4(3) pin units.

strotter13

Bum Bum Bum The verdict is in...

The new tranny has a 4 pin connector (one is blocked out), and i got up under my car and counted the wires and there are 5 (FIVE) wires going to the connection....

So where do I go from here?? I will post a new thread posing the question, and if any has performed the valve body swap and what it entails. I have a call in to the guy that sold me the transsmission, I am first going to see what he offers as a solution, and then go from there. I am wondering if it is possible for him to send me the correct valve body, with the correct wiring, and then I install it.

Has anyone done this? How bad can I screw things up? Thanks again everyone for the input.

RF1

Remove the plug, harness, valve body and separator plate from your trans, noting all of the checkball locations.
Swap it onto the new trans.
If the o-ring on the plug is damaged, swap it out.
Valve body bolts torque to 85 inch pounds.
With a shop manual, a few photos, and patience, it isn't as scary as it seems.

WVZR-1

This of course is the only option the OP should consider regarding the install and I'd probably consider swapping the known Corvette governor while I was doing it. If the OP had any qualms regarding the work I believe I'd just absorb the fees and hire out the swap. The OP also has the ASR adjustments to consider and those need to be done correctly or the entire task is very susceptible to failure anyway.

It's difficult to understand that the OP entered into a ship "across the country" and hints that the electrical was discussed beforehand but didn't confirm all of this before "the buy".

Depending on what the OP finds after removing the pan it's very likely the valve body needs serviced anyway.