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4L80 TCM

Chris , I got my books off Ebuy . Not that much in the wiring , see what you can come up with . I'll check from this end .
 
Just checked the 95 G van manual , I think you should try and find a copy . 27 wires but a lot of that you should already have , just need to know which section to put the wires in . The manual shows the 24 and 32 pin connectors , what wires go into the sections and a small wiring diagram that shows the various sensors .
 
Thanks mate
Having a job finding the correct diagram ,found something through auto zone ,one for 95 g van 6.5 with 4l80e it shows tcm connector numbers but the wire colours will be different I'm thinking on my 98
 
Maybe search for military manuals on line also. All hmmwv's have db2 ip. Hummer up to 1995 is db2, at 96 and newer are ds4. I have a nearly complete manual for mine, But unfortunately the wiring diagrams are not readable.
 
It should be the same. Can you post the link for myself and others?

Also then some of the way smart guys on here might look at it and see if they notice anything that would be different.
 
Don't worry about the color of the wires , just follow the circuits . The G van shows both TCM connectors as being purple , don't know if they are on your truck as some of the colors indicate different connectors .
 
No dramas.im hoping to have a win with this.
The only thing iv noticed with the hummer tcm is that there appears to be a tranny mode switch ?? No dought there will be other differences .ill see if I can stick a screen capture up or somthing
 
This is what I found guys
Whether it will make it run is a different question ,but I'm hoping with a fair amount of tenacity and a good splash of desperation I can make it happen
Like I said before there are three mode wires on the tcm,I'm presuming that's a military thing also iv noticed on a few of the other photos I downloaded there is a wire marked Baro sensor ( D14 )
I remember something like this being in the ds4 pump,what is it and what does it do ?
 
Barometer , measures atmospheric air pressure . Right off there is no ALDL connector and the trans relay has 24 volt input . Any numbers on the TCM ? What color are the connector cavities in the TCM . The rest are pretty close to the 95 G van . Still think it would be best to get both manuals and check the wiring .
 
Iv found a g van TCM scematic and I'm hoping to do a overlay that on to my 98 schematic and come up with a diagram that works
Sorry about the whole hummer hummwv thing I do relise there is a difference ☺️
 
Look you can use the 94-2002 GM TCM with a Mechanical Injector pump. There are two different pumps and TCM calibrations to function and shift.
The engine limits the RPM in most to about 3,300. But the "Squeezer" as we termed it in calibration, was offered to save fuel and increase MPG. The Squeezer limited the RPM in the mechanical pump to aprox 2,700 RPM. We released calibrations for each application. I don't remember what the squeezer is really called BUT the GM Calibration listing @ a parts dealer could help you.
You will have to have the TPS in order to have any TCM function.
If you elect an non GM TCM, you can but you have to purchase their harness or try to buy their TCM ends and connectors to convert thiers to the GM harness. I would use the GM TCM and it is farily easy to do so.
If you follow some of these expert opinions, you will be lost, spend allot of cash and have a burned up trans and still not addressing the TCM/Harness, it will burn up again.
Some of the aftermarket modifications will cause LOW LINE PRESSURE and very unstable line pressure. On hole that Gil younger tell you to do will baloon the converter and push excess pressure on your engine crank thrust bearing. The hole is about 0.035" and tell you to do this in the pump body to connect two passages - Line pressure to converter feed.
Another mode some do is to enlarge the Pump cover pressure reg Balance hole. this WILL cause the trans to whine COLD and sound as the converter is about to have a catastrophic failure.
Don't use these non gm TCM's on a 91-93. Read the other post abut the 4L80-E questions.
It's your back and money. I wouldn't follow 90% of the opinions here. These experts speak without knowing and will cause you great pains and money.
 
Yeah I'm not going to be drilling no holes in stuff ,my tranny was good before I swapped pumps ,
I'm half way trough the wire up ,ended up pulling the harness of the tranny and proving each wire just to make sure,the. Diagram I'm using is for a 94 G. Van with. 4l80e ,I'm starting to wonder if the TCM that I have 16196390' is even configured for this diagram,but all I can do is try if it don't run then it's goin to get a optishift
 
wilber said:
Look you can use the 94-2002 GM TCM with a Mechanical Injector pump. There are two different pumps and TCM calibrations to function and shift.
The engine limits the RPM in most to about 3,300. But the "Squeezer" as we termed it in calibration, was offered to save fuel and increase MPG. The Squeezer limited the RPM in the mechanical pump to aprox 2,700 RPM. We released calibrations for each application. I don't remember what the squeezer is really called BUT the GM Calibration listing @ a parts dealer could help you.
You will have to have the TPS in order to have any TCM function.
If you elect an non GM TCM, you can but you have to purchase their harness or try to buy their TCM ends and connectors to convert thiers to the GM harness. I would use the GM TCM and it is farily easy to do so.
If you follow some of these expert opinions, you will be lost, spend allot of cash and have a burned up trans and still not addressing the TCM/Harness, it will burn up again.
Some of the aftermarket modifications will cause LOW LINE PRESSURE and very unstable line pressure. On hole that Gil younger tell you to do will baloon the converter and push excess pressure on your engine crank thrust bearing. The hole is about 0.035" and tell you to do this in the pump body to connect two passages - Line pressure to converter feed.
Another mode some do is to enlarge the Pump cover pressure reg Balance hole. this WILL cause the trans to whine COLD and sound as the converter is about to have a catastrophic failure.
Don't use these non gm TCM's on a 91-93. Read the other post abut the 4L80-E questions.
It's your back and money. I wouldn't follow 90% of the opinions here. These experts speak without knowing and will cause you great pains and money.
Click to expand...
I'm going to go out on a limb and guess you were a GM enginner?
 
wilber said:
Look you can use the 94-2002 GM TCM with a Mechanical Injector pump. There are two different pumps and TCM calibrations to function and shift.
The engine limits the RPM in most to about 3,300. But the "Squeezer" as we termed it in calibration, was offered to save fuel and increase MPG. The Squeezer limited the RPM in the mechanical pump to aprox 2,700 RPM. We released calibrations for each application. I don't remember what the squeezer is really called BUT the GM Calibration listing @ a parts dealer could help you.
You will have to have the TPS in order to have any TCM function.
If you elect an non GM TCM, you can but you have to purchase their harness or try to buy their TCM ends and connectors to convert thiers to the GM harness. I would use the GM TCM and it is farily easy to do so.
If you follow some of these expert opinions, you will be lost, spend allot of cash and have a burned up trans and still not addressing the TCM/Harness, it will burn up again.
Some of the aftermarket modifications will cause LOW LINE PRESSURE and very unstable line pressure. On hole that Gil younger tell you to do will baloon the converter and push excess pressure on your engine crank thrust bearing. The hole is about 0.035" and tell you to do this in the pump body to connect two passages - Line pressure to converter feed.
Another mode some do is to enlarge the Pump cover pressure reg Balance hole. this WILL cause the trans to whine COLD and sound as the converter is about to have a catastrophic failure.
Don't use these non gm TCM's on a 91-93. Read the other post abut the 4L80-E questions.
It's your back and money. I wouldn't follow 90% of the opinions here. These experts speak without knowing and will cause you great pains and money.
Click to expand...

I've been there many times and will say it again. You are going to be time and money ahead to purchase an aftermarket TCM.
If you use a 94-2000 TCM there will always be some little problem your dealing with. He's going to have many more hours invested before he succeeds or not trying to use a TCM. Point is Vintex could have be done by now.
OptiShift/US Shift is a very good TCM I'd even say better than a stock 92-93 TCM. It is fully adjustable blah blah.....
US Shift Quick1 complete kit is only $550, Quick4 is $750 an excellent value IMO.
How much time and money will you have buying a stock TCM and related parts to make a stock 92-93 TCM work? It may or may not be much, but if your buying from scratch maybe $200-300? + time to get it working. So just not going to be worth it IMO and in the end have less TCM capabilities than a US Shift.
 
Burning oil said:
I've been there many times and will say it again. You are going to be time and money ahead to purchase an aftermarket TCM.
If you use a 94-2000 TCM there will always be some little problem your dealing with. He's going to have many more hours invested before he succeeds or not trying to use a TCM. Point is Vintex could have be done by now.
OptiShift/US Shift is a very good TCM I'd even say better than a stock 92-93 TCM. It is fully adjustable blah blah.....
US Shift Quick1 complete kit is only $550, Quick4 is $750 an excellent value IMO.
How much time and money will you have buying a stock TCM and related parts to make a stock 92-93 TCM work? It may or may not be much, but if your buying from scratch maybe $200-300? + time to get it working. So just not going to be worth it IMO and in the end have less TCM capabilities than a US Shift.
Click to expand...
I have a feeling he is a retired enginner, or associated with design in some fashion. From my personal experience, those who were involved in that fashion feel that only they can design something to work with it. I don't see a problem with the OPTISHIFT or several other aftermarket controllers(I'm not a fan of the JAKES setup that runs full line pressure and shifts at the turn of a switch). When I worked at a dealer as a technician, we all HATED engineers because they always took the only we can do it approach, so just do as I say. We REALLY hated it when we would have to find fixes for there mistakes in the field with them telling us to do it like they did it which has proven to not work, and we were tired of fixing the same problem over and over again.
 
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