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Have a 1/2" hole, what pipe thread size #4610757
12/22/17 12:17 AM
12/22/17 12:17 AM
Joined: Dec 2012
Posts: 1,553
Oregon coast
asand1 Offline OP
asand1  Offline OP

Joined: Dec 2012
Posts: 1,553
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.


2004 GMC Yukon SLuT
Re: Have a 1/2" hole, what pipe thread size [Re: asand1] #4610771
12/22/17 12:38 AM
12/22/17 12:38 AM
Joined: Jun 2017
Posts: 40
left cose, USA
resist Offline
resist  Offline

Joined: Jun 2017
Posts: 40
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.

Re: Have a 1/2" hole, what pipe thread size [Re: resist] #4610900
12/22/17 07:17 AM
12/22/17 07:17 AM
Joined: Jul 2011
Posts: 114
MICHIGAN USA
LEADED Offline
LEADED  Offline

Joined: Jul 2011
Posts: 114
MICHIGAN USA
9/16 -12 standard thread , drill size .508 hole . If you need fine tread you can upgrade good luck

Re: Have a 1/2" hole, what pipe thread size [Re: asand1] #4610927
12/22/17 07:50 AM
12/22/17 07:50 AM
Joined: Nov 2006
Posts: 21,264
MA, Mittelfranken.de
Trav Offline
Trav  Offline

Joined: Nov 2006
Posts: 21,264
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


ASE L1, Master. Deutsch Meisterbrief.
Re: Have a 1/2" hole, what pipe thread size [Re: Trav] #4611191
12/22/17 12:58 PM
12/22/17 12:58 PM
Joined: Dec 2016
Posts: 8,018
Waco, TX
Linctex Online content
Linctex  Online Content

Joined: Dec 2016
Posts: 8,018
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!


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
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