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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