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Sucess! Thanks for all the help from the forum members, especially @springer1981 @Mogman @Retiredwarhorses @Mullaney I seem to have two minor problems I found on my short test drive. Seems there is a knocking noise that changes with vehicle speed. I thought it might be something on the front...

Looks very muck like the one I just used. The part number @springer1981 kindly provided me was GM TH160 which is now a lot more than when I bought it months ago. I figured out the pinouts based on instructions provided by US Shift.com. The US-Shift.com controller wants .22V minimum to auto...

Thank you! I have a good soldering iron with a tip that is in bad shape so I used that it you are indeed correct - Easy Peeasy! In case this helps someone in the future, here is what the shaft without the cam, with the pin remaining on the shaft. Problems just melt away with the knowledgeable...

I wanted to post another question regarding installing the TPS so I don't make an expensive mistake. I got off the Fan CutOff Switch. There is a black cam for the Fan CutOff switch left on the shaft as shown below. I assume this black plastic cam needs to be removed. Sounds like I need to...

Notice gap at right arrow, and missing bolt hole on left. The holes on the right side of the picture appear to be ok. I guess if I had good fab skills I could make it fit. But I don't!

Two piece

A minor set back that I can use some advice on please. Looks like the flywheel dust cover for the TH400 is different than the 4L80? Now that I tried to mount the original TH400 dust cover the bolt holes seem to be off and it leaves a gap near the bottom of the 4L80. Aside from rummaging...

Just an update in case my experience is helpful to anyone else in the future. Lesson 1: Don't try to use a cheap Chinese tranny jack that is powered by a manually operated 1/2" ratchet to lift one of these beasts! While lowering the old TH400 with the gearbox attached is no problem for one of...

Making more slow progress. Fuel tank is replaced without a lot of drama. Well except for a neighbor that posted the below. And the neighborhood Gestapo that sited me for working on my truck MY driveway. With no transmission sitting in there, I was able to remove to the two bolts for the...

I made some progress and got the 3 speed out without drama. Next I will be replacing the leaking fuel tank with a new one thanks to the good deals that @springer1981 pointed out to me (y) I also have more space now to get the last two remaining bolts from the drinker's side exhaust manifold...

I am not really an tranny expert as you can well tell, but I am curious what this thingy is on the drinker's side of the front? Looks like it is some kind of vacuum diaphram? The 4L80 does not seem to have it so I assume I just plug the hose.

Thank you for your patience with this newbee. One more question is regard to the speedo sensor. Should I use the sensor that came on the 4L80, and just reconnect the speedo cable on the truck? Or use the original speedo sensor assembly that was on the 3 speed tranny? Also, what is this...

Perfect! That was easy! I slightly bent the heat shield a bit and I was able to get a wrench on one of them. The other two are being difficult to get a wrench on. All are loose, but I need to get a wrench on the other end as they keep turning. I am guessing that these two will be the sort of...

Once again I need the wisdom of the collective as I am kind of stuck on a few things doing this 4L80 swap. I am officially retired, as of today. So now I will actually have some time to work on this project. Plus the Florida Inferno has eased a bit so I won't roast while outside. Here is where...

Next question for the experts here. I am almost at the stage where I would remove the old 3 speed tranny. I have the dog house off, exhaust cleared, drive shafts out and just have to disconnect the little things. When you remove the tranny, do you need to support the engine? It looks like the...

I will post this information in case it might be helpful to anyone else. The part number of the bearing they sent as a replacement was 3130-01-203-9870 and that is indeed what I needed. After receiving the correct carrier bearing, I found the instructions at this link were not quite workable...

Ok, I called the people that sent me the kit in the picture. They said I need a different one. They are going to swap out the kit for me. (y)

The one I received has part number 2520-01-356-9189 - was supposed to be for front drive shafts for 92-04 with 4 speed - which I think is the longer front driveshaft that I got with my 4L80. OE/OEM Part Number: 2520-01-189-2135 5-213X 5306-01-190-5760, 5340-01-190-0807 2-70-18X Interchange...

I can really use some help with the installation of the front drive sfat carrier bearing please. The rebuild kit I got looks a bit different over the one that was on the front shaft. I tried looking at the TM's but cannot see what I need - an exploded diagram on the right way to install the...

Well this is turning into quite the adventure. I managed to find a US made carrier bearing rebuilt kit so I managed to avoid all the Chinese crap. The two of us tried pulling the half shafts apart but we are total weaklings and while we could get it to the point to see the splines, but it...