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04-02-2022, 01:14 AM
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#1 |
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Registered User
Join Date: Oct 2015
Location: Spokane, Wa
Posts: 112
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NP 208 Woes
Hi all, i have an 82 k20 with an NP 208, and I just drove from spokane to portland with it. Driving off the freeway (hard braking) it felt like the tcase was popping out of 2hi. I plan on driving back to spokane on sunday, Is there anything I can do to mitigate this? To give some background, the truck is an old 6.2 diesel that has been swapped to a vortec 454 and 4l80e with original tcase (~250k miles). I have taken the truck on many very long trips (2,000 mile and 5,000 miles etc) with no issues. Drive it ~350 miles and it decides to act up now? Any input is much appreciated. Thank you.
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04-02-2022, 01:29 AM
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#2 |
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Senior Member
 Join Date: Mar 2003
Location: Colfax-California
Posts: 8,402
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Re: NP 208 Woes
Could be a couple of things with that many miles on it. First thing comes to mind is the shift fork plastic pads are shot. Could also be the shift linkage has worn out the bushings and is pulling on the fork. Thrust bearings inside. After 250k miles could be just worn out looking for some fresh parts. I assume you checked the oil level.
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04-02-2022, 07:36 AM
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#3 |
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Registered User
Join Date: Jun 2014
Location: upstate sc
Posts: 2,095
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Re: NP 208 Woes
The range fork is worn out...be fore warned they are very hard to find.
I had to pay $365 for the last one I bought. |
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04-02-2022, 08:16 AM
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#4 | |
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Registered User
Join Date: Dec 2012
Location: Temple City
Posts: 3,566
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Re: NP 208 Woes
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04-02-2022, 11:07 AM
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#5 |
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Senior Member
Join Date: Mar 2003
Location: Colfax-California
Posts: 8,402
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Re: NP 208 Woes
I think I've got a complete T400 208 complete under my work bench
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04-02-2022, 04:19 PM
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#6 | |
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Registered User
Join Date: Oct 2015
Location: Spokane, Wa
Posts: 112
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Re: NP 208 Woes
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04-06-2022, 01:56 AM
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#7 |
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Registered User
Join Date: Oct 2015
Location: Spokane, Wa
Posts: 112
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Re: NP 208 Woes
Just wanted to update everyone, tcase took ~3.5 qts. Of ATF. Drove home just fine, drained it when I got to the shop and found a bit of trash stuck to the magnet. It ate something, can’t tell what it is. Synchro maybe? Nevertheless, ordering parts for it now. I refilled it with tractor fluid and it seems to be holding fluids much better than before, it leaked ATF immediately.
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04-06-2022, 11:23 AM
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#8 |
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Senior Member
Join Date: Oct 2014
Location: Bay Area, CA
Posts: 329
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Re: NP 208 Woes
If you need, I may part out my T/Case. The actual case is pretty beat up, but it stays in gear. I will let you know if I do and see if you still need anything.
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04-06-2022, 12:14 PM
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#9 | |
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Registered User
Join Date: Oct 2015
Location: Spokane, Wa
Posts: 112
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Re: NP 208 Woes
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