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Have a 1/2" hole, what pipe thread size #4610757
12/21/17 11:17 PM
12/21/17 11:17 PM
Joined: Dec 2012
Posts: 1,547
Oregon coast
asand1 Offline OP
asand1  Offline OP
Joined: Dec 2012
Posts: 1,547
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.


2015 V6/6MT 1LT Camaro
Re: Have a 1/2" hole, what pipe thread size [Re: asand1] #4610771
12/21/17 11:38 PM
12/21/17 11:38 PM
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 06:17 AM
12/22/17 06:17 AM
Joined: Jul 2011
Posts: 108
MICHIGAN USA
LEADED Offline
LEADED  Offline
Joined: Jul 2011
Posts: 108
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 06:50 AM
12/22/17 06:50 AM
Joined: Nov 2006
Posts: 20,562
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 20,562
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 11:58 AM
12/22/17 11:58 AM
Joined: Dec 2016
Posts: 7,110
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 7,110
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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