Hasn’t moved under its own power in about 18 years so I can’t tell you for sure on that. However, with a np231 when in 4wd on hardball it would buck a little on turns but otherwise Ok, I’d imagine pinning the viscous coupler would result in a similar function… I’ll let y’all know when she moves, I can post the steps to pin it, it’s pretty straightforward.devildog80 wrote:I get the rear axle being open, but is the front axle open as well?
Or do they buck when turning?
Can you drop the rear shaft and still get home with just the front axle working?
If I find my NP229 is not good (when I get it road worthy), thinking of dropping the TC, and replacing the 727 tail shaft with a longer one like a 2 wheel drive would use, and run my truck as a 2 wd until funds can find a 228 and manual front hubs!
Would keep me rolling
dodgerammit wrote: ↑Sun Aug 07, 2022 4:50 pm A 228 has an open differential. The 229 has a limited slip differential. Pinning the coupler will lock it. So, it'll be a part time setup, not to be driven on pavement in 4wd unless there is snow and tires can slip a bit.
If the VC is completely toast, it will act as an open differential while in 4WD High Range (it locks in low range). So yes, you could get stuck with one tire spinning up front. But you still have the advantage of being able to drive in AWD on the roads in rainy or snowy weather.Anvil-3 wrote: ↑Sun Aug 07, 2022 9:24 amSo I could turn it by hand, couldn’t register on my tq wrench. I just pinned it which is reversible.Stuka wrote:While the spec is 25, if you are seeing ten that means it still functions. And you can drive around in AWD without any real issues.
If the VC totally fails, it just acts as an open differential, like the 228 or 242. You won’t hurt anything by driving it.
Could you clarify that a little? Like would any free spinning wheel cause me to lose power? From my understanding with the pinned coupling it would be like a 231 and I’m locked in at 50/50 power between front and rear, while still having my open differentials for slippage between wheels on the same axle
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I was testing it disassembled according to the manual, so it was the input with the coupling and output shaft of a vice and testing with a torque wrench. I guess at this point I’m unsure which way I want it… but it’s good to know I have the option of either way.Stuka wrote:If the VC is completely toast, it will act as an open differential while in 4WD High Range (it locks in low range). So yes, you could get stuck with one tire spinning up front. But you still have the advantage of being able to drive in AWD on the roads in rainy or snowy weather.Anvil-3 wrote: ↑Sun Aug 07, 2022 9:24 amSo I could turn it by hand, couldn’t register on my tq wrench. I just pinned it which is reversible.Stuka wrote:While the spec is 25, if you are seeing ten that means it still functions. And you can drive around in AWD without any real issues.
If the VC totally fails, it just acts as an open differential, like the 228 or 242. You won’t hurt anything by driving it.
Could you clarify that a little? Like would any free spinning wheel cause me to lose power? From my understanding with the pinned coupling it would be like a 231 and I’m locked in at 50/50 power between front and rear, while still having my open differentials for slippage between wheels on the same axle
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If you pin it, then yes, it will act like an NP208. Where 4WD High Range locks the front and rear axles to the same speed. This means you cannot use high range on dry or wet pavement. Its only usable in snow or in dirt.
On a side note, how were you testing it? The NP229 shifts from 2wd to 4wd using a vacuum motor. Just want to make sure your test was valid, and that it truly was in 4WD.
Ah, ok. So you already have it apart. If you do decide to pin it, you should consider installing manual locking hubs up front. They are not a requirement, but they will stop everything from spinning up front in 2wd, and prevent accidentally having 4wd on pavement.Anvil-3 wrote: ↑Sun Aug 07, 2022 6:17 pm I was testing it disassembled according to the manual, so it was the input with the coupling and output shaft of a vice and testing with a torque wrench. I guess at this point I’m unsure which way I want it… but it’s good to know I have the option of either way.
Devildog, thanks for that, I hadn’t found anything since the old post I found. I’ll have to think it through but options are good and I’m glad it holds up pinned. My fear was turning the case into a grenade.
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Anvil-3 wrote: ↑Sun Aug 07, 2022 6:17 pmI was testing it disassembled according to the manual, so it was the input with the coupling and output shaft of a vice and testing with a torque wrench. I guess at this point I’m unsure which way I want it… but it’s good to know I have the option of either way.Stuka wrote:If the VC is completely toast, it will act as an open differential while in 4WD High Range (it locks in low range). So yes, you could get stuck with one tire spinning up front. But you still have the advantage of being able to drive in AWD on the roads in rainy or snowy weather.Anvil-3 wrote: ↑Sun Aug 07, 2022 9:24 am
So I could turn it by hand, couldn’t register on my tq wrench. I just pinned it which is reversible.
Could you clarify that a little? Like would any free spinning wheel cause me to lose power? From my understanding with the pinned coupling it would be like a 231 and I’m locked in at 50/50 power between front and rear, while still having my open differentials for slippage between wheels on the same axle
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If you pin it, then yes, it will act like an NP208. Where 4WD High Range locks the front and rear axles to the same speed. This means you cannot use high range on dry or wet pavement. Its only usable in snow or in dirt.
On a side note, how were you testing it? The NP229 shifts from 2wd to 4wd using a vacuum motor. Just want to make sure your test was valid, and that it truly was in 4WD.
Devildog, thanks for that, I hadn’t found anything since the old post I found. I’ll have to think it through but options are good and I’m glad it holds up pinned. My fear was turning the case into a grenade.
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