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#4610757 - 12/21/17 11:17 PM Have a 1/2" hole, what pipe thread size
asand1 Offline


Registered: 12/16/12
Posts: 1542
Loc: Oregon coast
Helping a friend rebuild an NV3500 in his 5.2L Dakota. We want to replace the shift rail detent plug with a tapered pipe plug rather than the interference fit one. The bore is 1/2" and I would like to know what size pipe tap would work without any more drilling/reaming?

This is the second time the trans has been apart and we are worried about it popping out on the road or the difficulty of future removals.
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#4610771 - 12/21/17 11:38 PM Re: Have a 1/2" hole, what pipe thread size [Re: asand1]
resist Offline


Registered: 06/08/17
Posts: 40
Loc: left cose, USA
Originally Posted By: asand1
Helping a friend rebuild an NV3500 in his 5.2L Dakota. We want to replace the shift rail detent plug with a tapered pipe plug rather than the interference fit one. The bore is 1/2" and I would like to know what size pipe tap would work without any more drilling/reaming?

This is the second time the trans has been apart and we are worried about it popping out on the road or the difficulty of future removals.


Oh that is a great upgrade. Those darned things are always falling out or getting stuck.

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#4610900 - 12/22/17 06:17 AM Re: Have a 1/2" hole, what pipe thread size [Re: resist]
LEADED Offline


Registered: 07/13/11
Posts: 93
Loc: MICHIGAN USA
9/16 -12 standard thread , drill size .508 hole . If you need fine tread you can upgrade good luck

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#4610927 - 12/22/17 06:50 AM Re: Have a 1/2" hole, what pipe thread size [Re: asand1]
Trav Offline


Registered: 11/20/06
Posts: 18861
Loc: MA, Mittelfranken.de
This will do the job, they sell it with the drill bit below. The hole needs to be opened up slightly to 37/64 so its not a large increase from 1/2". This will give you 3/8 tapered NPT threads for a 3/8 tapered pipe plug.
Not top shelf quality but for a couple of holes its good enough.


https://www.amazon.com/Hanson-1904-HANSON-Tap/dp/B000UE1VCM/ref=sr_1_3?ie=UTF8&qid=1513946764&sr=8-3&keywords=3%2F8+tap+npt
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#4611191 - 12/22/17 11:58 AM Re: Have a 1/2" hole, what pipe thread size [Re: Trav]
Linctex Offline


Registered: 12/31/16
Posts: 6148
Loc: Waco, TX
Originally Posted By: Trav
The hole needs to be opened up slightly to 37/64 so its not a large increase from 1/2". This will give you 3/8 tapered NPT threads for a 3/8 tapered pipe plug.


Yes, exactly what is needed!
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