NP205 Speedo leak - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Accelo** · 10-27-2021, 10:39 AM

Go ahead and us sealant. I use Permatex 82180 Ultra Black Maximum Oil Resistance for this application. However, I would use what I had. Pipe sealant would also work.
I don't believe GM used a gasket, and the surface would be very small if they did.
The speedometers on the 205's were built before GM put a serious effort into oil leaks.
The early sleeve nuts didn't even had a seal installed in them. Look carefully for wear on the gear seal surface and for excessive play of the gear in the nut bore.

10-27-2021, 10:39 AM	#14
Accelo Senior Member Join Date: Mar 2015 Location: washington Posts: 2,196	Re: NP205 Speedo leak Go ahead and us sealant. I use Permatex 82180 Ultra Black Maximum Oil Resistance for this application. However, I would use what I had. Pipe sealant would also work. I don't believe GM used a gasket, and the surface would be very small if they did. The speedometers on the 205's were built before GM put a serious effort into oil leaks. The early sleeve nuts didn't even had a seal installed in them. Look carefully for wear on the gear seal surface and for excessive play of the gear in the nut bore.



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