Speed sensor leaking

kenh · Apr 17, 2021

1990 C1500 5.7 with a 4L60 700R4)

I have an oil leak from the speed sensor on the tail case of the trans. It leaks enough the case is clean under the sensor. It almost appears like the electrical plug is leaking??? It is a plastic part that presses into the trans, I assume with an O-ring seal.

Is it common for the plug to leak? If not, does anybody know the ID and section of the O-ring. It would be nice to only pull the sensor one time to replace the o-ring.

Thanks!

Ken

PlayingWithTBI · Apr 17, 2021

kenh said:
Is it common for the plug to leak? If not, does anybody know the ID and section of the O-ring. It would be nice to only pull the sensor one time to replace the o-ring.

It looks like it's somewhere around 2" ID and 2-3/8" OD? You may have another issue.
https://www.ebay.com/itm/700R4-4L60...eal-2-Inch-Diameter-Speedometer-/290509338480

IIRC the slip yoke and O-ring goes in before the VSS reluctor gear to keep any fluid from migrating back on the shaft.
https://www.ebay.com/itm/Drive-Shaf...L60E-4L65E-Transmission-1985-UP-/142397291061

When I bought my last trans it didn't come with the reluctor or the slip yoke tube. I wound up getting them somewhere on line (I don't remember where), jacked up the rear of the truck, removed the tail shaft, and installed them. It didn't hardly leak any at all. This is how it came from the trans builder (after I removed the tail housing), pissed me off! :321:

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kenh · Apr 17, 2021

90% sure it's the speed sensor. The case is dry enough forward of the sensor. The sensor itself is dripping wet.

Ken

GoToGuy · Apr 17, 2021

The GM parts diagram calls for a GM or ACDELCO #10054241. It is .687 I.D. by .1 thick. Which is 11/16 id by 3/32 thick also Standard AS 568 O Ring size " A0115" thats from your description of whar you need. Good luck.

kenh · Apr 18, 2021

GoToGuy said:
The GM parts diagram calls for a GM or ACDELCO #10054241. It is .687 I.D. by .1 thick. Which is 11/16 id by 3/32 thick also Standard AS 568 O Ring size " A0115" thats from your description of whar you need. Good luck.

Thanks!

Speed sensor leaking

kenh

I see nothing I hear nothing

PlayingWithTBI

2022 Truck of the Year

kenh

I see nothing I hear nothing

GoToGuy

I'm Awesome

kenh

I see nothing I hear nothing

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