DIY NP231 to Dana300 HD doubler - Pirate4x4.Com : 4x4 and Off-Road Forum
 
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Old 08-12-2015, 06:22 PM   #1 (permalink)
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DIY NP231 to Dana300 HD doubler


FrogFab is now manufactering HD doubler kit for jeep or buggy.



Will fit with any 231 case and any input 231 shaft.

Come will complete head threated HD output shaft that replace the dana300 input shaft.



Just have to cut your 2.31 and weld the side side on it or use JB weld to fix it.

We have sold more than 20 kit localy since a couple of year and we now sure that every one will like our DIY kit.

Start price for first mount 580$ shipping include to all lower state and canada
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Old 08-20-2015, 06:12 PM   #2 (permalink)
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Old 08-22-2015, 02:08 PM   #3 (permalink)
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How do I get a hold of you
pm sent
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Old 10-13-2015, 04:16 PM   #4 (permalink)
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up... couple of kit ready to ship...

Special for the first one that order it after my post

500$ ship to 48 lower state
Just send a pm with your email and I will send a paypal invoice
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Old 10-13-2015, 08:06 PM   #5 (permalink)
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Got any pics of a complete set up done?
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Old 10-14-2015, 07:07 AM   #6 (permalink)
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Got any pics of a complete set up done?
here one with flip t-case for left front diff



I will try to find more picture of other kit installed
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Old 10-29-2015, 12:53 PM   #7 (permalink)
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How can i get in touch with you.
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Old 10-30-2015, 08:07 AM   #8 (permalink)
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Will this work with a GM NP231?
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Old 10-30-2015, 08:45 AM   #9 (permalink)
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How can i get in touch with you.
Pm sent back
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Old 10-30-2015, 08:45 AM   #10 (permalink)
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Will this work with a GM NP231?
Yes will work with any 231 and any 231 input shaft
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Old 12-02-2015, 05:45 PM   #11 (permalink)
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Other pictures

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Old 12-30-2015, 08:28 AM   #12 (permalink)
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Subscribed to this for the doubler application for my MJ !
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Old 01-07-2016, 06:13 AM   #13 (permalink)
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Are these built to order at do you have them on the shelf?

How much length does it add to the 300?
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Old 01-07-2016, 08:25 AM   #14 (permalink)
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could you pm me please, and does the kit come with all hardware?
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Old 01-07-2016, 10:57 AM   #15 (permalink)
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Are these built to order at do you have them on the shelf?

How much length does it add to the 300?
we normaly have them on shelf...

It add around 8 inch to the 300
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Old 01-07-2016, 10:58 AM   #16 (permalink)
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we normaly have them on shelf...

It add around 8 inch to the 300
Thanks. Trying to decide if I want to go this way or 4:1 my 300.
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Old 01-07-2016, 10:58 AM   #17 (permalink)
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could you pm me please, and does the kit come with all hardware?
yes it coming with all hardware and the plate to close the 231 housing after it have been cut.
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Old 01-07-2016, 11:01 AM   #18 (permalink)
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Thanks. Trying to decide if I want to go this way or 4:1 my 300.
I running the two option in my truggy since a couple of years

231 with 4:1 d300
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Old 01-12-2016, 07:51 AM   #19 (permalink)
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do you guys have a site to order from?
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Old 01-12-2016, 08:34 AM   #20 (permalink)
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do you guys have a site to order from?
no, just pm you email and we will sent you a paypal invoice
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Old 01-14-2016, 02:27 PM   #21 (permalink)
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We currently working on a 231/241 to np205 kit that use a 32spline gm input shaft.
Price will be around 600-650 ship to 48 state.

Please let us know if someguy are interested, planning delivery date around march.
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Old 01-25-2016, 10:51 AM   #22 (permalink)
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Is anyone ordering these have having luck with them?
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Old 02-01-2016, 02:25 PM   #23 (permalink)
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Is anyone ordering these have having luck with them?
I have asked them to send me an invoice via PayPal. I'll be ordering as soon as they invoice me and I'll update.
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Old 02-01-2016, 02:46 PM   #24 (permalink)
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I have asked them to send me an invoice via PayPal. I'll be ordering as soon as they invoice me and I'll update.
Ordered mine from them I think Wednesday. They said they would be sending it out Sunday. Hoping for good news soon
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Old 02-06-2016, 09:26 PM   #25 (permalink)
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Hey FrogFab, I know this is for the 231 to 300. I am really looking for a 231 to 242(231) that a few others were selling over the last few years. I have both cases and block off plates, adapters. I am just looking for the intermediate shaft. Is that something you can provide?
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