TH400 to 4L80E swap and 1227747 to 16197427 swap

[MxRace75]

I'm going to convert my 87 Chevy 4x4 - 350tbi/t400/np208 over to a 4l80e/np208

I'm swapping in a 16197427 controller and I believe there was a cal for that ecu and the 4l80e

My first question would be what year 4l80e transmissions should I be looking at?

Second question is if I get a 4x4 4l80e do I need to install a speed sensor in the transmission for the ecu and use the current sensor in the t case for the speedo? Or is there better options?

Thanks for any help you guys can offer

[fastacton]

When using the 7427, you'll need a '94 or later 4L80. The '91-93 have a force motor that isn't compatible and would need the '7060 ECM instead. The 4L80 uses two speed sensors (Input Speed & Output Speed). The forward sensor on the transmission is the input speed and the aft one is output. I'm not an expert on them, but I believe you could use either the one on the transmission (assuming it has one, could be blanked off on a 4x4) or the one on the T-case for output speed.

The speedo output will come off of the VSSB (Vehicle Speed Sensor Buffer). Your '87 probably has a DRAC(instead of VSSB) built into the gauge cluster, I don't recall if that year has a cable drive speedo, but if it does, you'll want to swap it with an electronic speedo. If it's already electronic, there might be a way to use it with the signal from the VSSB, but I'm not sure.

[billygraves]

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[MxRace75]

Thanks for the info.

Does a 98 4l80e have the same wiring connector as say a 95??

[fastacton]

Yep, same connector for a '98.

[MxRace75]

K I'll look for a 98-99 core. Should be a good place to start.

[billygraves]

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[1project2many]

Watch the aftermarket fittings... they're junk. Local GM dealer is selling someone else's fittings in little baggies with GM number on them. :(

There's a tool to make the trans quick connect fittings using a hydraulic flaring tool. This means you might be able to find a guy that can form ends for you. My local trans guy found 3/8" inverted flare adapter fittings in someone else's application, iow not GM. Possibly AM General for "real" Humvee?? I may have part numbers around. We were using them in buses until tool became available for quick connect ends. BTW, billygraves, do you know a "real" name for those fittings? We also know to use steel lines here. When high temp paint burns off of cooler lines you know things are hot.

Old school bus is a great source for 4L80E trans.

[MxRace75]

I have access to a hydraulic flaring tool for 1/4 thru 1/2 stainless line. We use Parker fittings on the Trans side. I'll probably going the custom steel line all the way to the cooler. Not sure what cooler I'll put on it yet.

[billygraves]

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[EDZIP]

FYI only..had this site bookmarked:

How to Control a 4l80E with a GM 16197427 ECM

http://mattw.dyndns.org/4L80E/

[MxRace75]

Friend of mine has a 06 he said he'll give me. Is this something I can use or is there a cut off on the years I can control with the 7427 ecu

[MxRace75]

I picked up a 2004 4l80e with convertor last night.

Would I be better running a 16196395 ecu since that's what came in the 94-95 350tbi trucks with a 4l80e or will the 16197427 work just fine. I have a 7427 ecu I just need the Eprom for it. Already have the moates adapter and a apu1

[brian617]

No difference in those PCMs, either one will run $OD $OE $E6 or $31.

[MxRace75]

Cool. Does it matter what eprom I buy to work with the adapter? Like does it have to be of the same base bin I plan on using??

[billygraves]

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[1project2many]

TPS I used a alum plate mounted the TPS sensor and an extension arm to the paddle

I have a diesel throttle pedal / APP sensor and TCM here. I thought it would be easy enough to weld an extension on the pedal to attach a cable but I haven't yet done a stand alone 4L80E install.

[billygraves]

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[1project2many]

That sounds like a neat setup.

I've never seen TP files for the TCM, either. Options are Tunercat or one of the TC resellers.

Years ago I helped a guy building a custom efi system. We used an electronic Q-jet for the throttle body. Machined the venturis out and used the TPS to a 165. The engine had vacuum hoses and wires all over and a quick glance left you thinking it was a carbed engine in full emissions gear.

XDF files are user made and we've only got so much information available to make them.

[billygraves]

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[1project2many]

TC author was involved with GM engineer early on to make custom cals, branched out into his own software. Early work involved disassembling but not sure where OBDII info came from. I don't know what's present or missing in TCM files but I've never had trouble getting anything added if it really exists in the cal. What's wrong with the OBDII files?

[MxRace75]

Should I use a BJDR eprom/bin from a 16196395 pcm for this build?? Since it will be a 350tbi / 4L80E / NP208?

I wasnt sure if that bin was 2wd or 4wd or if it even mattered.

The Trans I got is from a 2004 Hummer 6.5/4l80e. It has both the input and output sensors in the Trans so my plan is to use those for the Trans and keep the cable drive on the t case. I believe this software/Bin has a conversion in it for the t case when in low range.

[MxRace75]

I guess I should have asked the question

When using the G1 adapter do I need the original eprom on it for this swap ?? Or does it just use what's on the chip in the adapter?

[MxRace75]

I'm cruising right along getting parts and what not.

I've got a couple v8 memcals, vssb and connector, all the wiring for the Trans, and 3 ecu's (can never have to many laying around).

Ive been doing a ton of reading and I apreciate everyone's help. I'm hoping to start actually swapping the trans out in the next few weeks.

One thing I think I understand but I'm not sure on is vss output on the trans. I've read problems with people having 4lo shifting problems. My plan was to keep the cable driven speedo from the t case and use the output speed sensor in the transmission wired thru the vssb to the ecu. Will this work ?? Or will I have 4lo issues??

[MxRace75]

Where did all my helpers go?? :-)

[billygraves]

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[MxRace75]

Thanks Billy. I'm pretty glad this Trans has the output sensor still at the rear of the Trans.

Since I have a vssb with the 2 dip switches I should be able to set it up for the correct mph signal to the ecm

[MxRace75]

I'm pretty excited to say that I finally got the truck done. It drives a lot different now that's for sure. I'll have to post up some pictures and a few tips on how to solve a couple of problems I ran into.

[EDZIP]

I'm pretty excited to say that I finally got the truck done. It drives a lot different now that's for sure. I'll have to post up some pictures and a few tips on how to solve a couple of problems I ran into.


Congrats! I know the feeling...and hope to get another conversion fired up this week.