47-55.1 Speed sensor 700R4 transmission - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**hogfarm** · 12-28-2022, 07:24 PM

During the upgrade to my 54 pick-up I'm installing a 700R4 transmission. The transmission I took out was a 700R4 as well. The problem I have is the old trans had a speed sensor that screwed in replacing the speedo cable, it has worked great for years. The new trans has a electrical/ magnetic speed sensor. the old trans had 3 wires going to the trans, the new trans only takes 2 wires. How do I hook up the old to the new, do I need all 3 wires?

12-28-2022, 07:24 PM	#1
hogfarm Senior Member Join Date: Jan 2016 Location: Appleton Washington Posts: 592	Speed sensor 700R4 transmission During the upgrade to my 54 pick-up I'm installing a 700R4 transmission. The transmission I took out was a 700R4 as well. The problem I have is the old trans had a speed sensor that screwed in replacing the speedo cable, it has worked great for years. The new trans has a electrical/ magnetic speed sensor. the old trans had 3 wires going to the trans, the new trans only takes 2 wires. How do I hook up the old to the new, do I need all 3 wires?

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