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Old 01-23-2019, 07:06 PM   #1 (permalink)
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NWF doubler

I'm looking at doubler kits for my rig with a TH350/205. Northwest Fab is the only company I've found that makes a 203/205 doubler for the small bore 205; everyone else requires the large bore which means you either have to get it machined for the larger bearing or find a TH400 case. I know NWF makes quality stuff, but is there any strength concerns with using the small bore case on a doubler? Anyone here running one of these small bore kits?

Last edited by cozinsky; 01-23-2019 at 07:11 PM.
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Old 01-24-2019, 05:31 AM   #2 (permalink)
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I am not nor do I have any 1st hand....have you called NWF to ask their opinion?
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Old 01-24-2019, 05:50 AM   #3 (permalink)
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i didn't think you could get a 32 spine shaft to fit on a small bore case? it took me about 4 months to find a large bore 205.

if your that concerned i found a couple places on ebay for about 500 bucks sell just the 205 empty case (large bore) and then move everything over and get the proper 32 spine short input.
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Old 01-24-2019, 10:20 AM   #4 (permalink)
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NWF makes their own shafts and has doubler kits for 27 and 10 spline small bore 205s. They're about the same price as the ORD kit and its a bolt in with no boring required. But since the other companies all use the large bore shaft I was concerned with strength and wondered if anyone here has one.
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Old 01-24-2019, 11:11 AM   #5 (permalink)
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We stopped building kits for the smaller shafts in the 90s because every sale included a conversation about the vehicle setup and how hard it was used to figure out if it would be a problem. Along with making it easy to build the kits more compact, getting rid of the small input option also made it no question for anyone that any of our kits would take whatever you wanted to do with it, now or later. So we are kind of forcing you to step up in strength where you may not have to absolutely have it for your application BUT, you also won't have to worry about it. We feel pretty strongly that keeping the drivetrain together from the engine to at least one axle is a big deal since most of the time you can get home that way. Breaking a transmission or transfer case makes for a rough day.

We can machine your case or exchange a small hole case for a big hole case with the only downside being the shipping on a 45# box. It's also a very easy machine job but it can be hard to talk a shop into doing it. Having a nice clean case for them to work on and both bearings in hand can make it as easy as possible. And mark the input hole very clearly.
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Old 01-24-2019, 09:30 PM   #6 (permalink)
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You can run a 31 or 32 spline input in a small bore case. You just have to be crafty.

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Old 01-25-2019, 05:24 AM   #7 (permalink)
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You can run a 31 or 32 spline input in a small bore case. You just have to be crafty.

How?
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Old 01-25-2019, 06:14 AM   #8 (permalink)
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How?

I didn't realize they have this option now, but I made my own version of this: GM NP205 Fig8 Small Bore Conversion to GM 6 Bolt Round Adapter
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FOR SALE 1990 4runner 5.3 Vortec 40" MTR's Dana 60 14 bolt, 241/205 doubler 3 link front
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Old 01-25-2019, 08:08 AM   #9 (permalink)
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The only way I can think of doing that is to re-spline the 27 to 32. Other than that....
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Old 01-25-2019, 06:49 PM   #10 (permalink)
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The only way I can think of doing that is to re-spline the 27 to 32. Other than that....
No, did you click on the link? It's a different bearing
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Old 01-25-2019, 09:39 PM   #11 (permalink)
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Must be a bearing that they had made. Bearing was non-existent years ago
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Old 01-25-2019, 09:45 PM   #12 (permalink)
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It is a common NP241 transfer case input bearing ID for the big inputs OD for the small bore case comes with a spacer on the back side.

NWF sells the bearing and spacer like 75-100ish I have one somewhere for doing a 29 spline in a small bore case.

conversion bearing is 6010NR 50x80x16

small input/small bore 6307nr 35x80x21mm

so you need just 5mm spacer
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Old 01-26-2019, 07:31 AM   #13 (permalink)
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It is a common NP241 transfer case input bearing ID for the big inputs OD for the small bore case comes with a spacer on the back side.

NWF sells the bearing and spacer like 75-100ish I have one somewhere for doing a 29 spline in a small bore case.

conversion bearing is 6010NR 50x80x16

small input/small bore 6307nr 35x80x21mm

so you need just 5mm spacer
yep exactly. It's a bearing for the 95 and newer NP241 (narrow style bearing). I found that out when I happened to have that bearing in the shop and test fit it on the large input and the case Then just made my own adapter plate.

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FOR SALE 1990 4runner 5.3 Vortec 40" MTR's Dana 60 14 bolt, 241/205 doubler 3 link front
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Old 01-27-2019, 05:32 AM   #14 (permalink)
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It's also a very easy machine job but it can be hard to talk a shop into doing it. Having a nice clean case for them to work on and both bearings in hand can make it as easy as possible. And mark the input hole very clearly.
This is the route I took. $50 at a local machine shop and I was on my way.

Ever pull a 205 on the trail? Trust me, use the larger input shaft and let something else that's easier to get at break.
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Last edited by IDScout; 01-27-2019 at 05:32 AM.
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