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Author Topic: NP203 Theory  (Read 7231 times)

Offline Cabcorner

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NP203 Theory
« on: November 04, 2013, 08:51:09 pm »
          Riddle me this - Would I be able to flat tow a 70's chevy  unconverted full time 4x4 that has locking hubs and a twin sticked transfer case by unlocking the hubs, shifting the transmission and transfer case into neutral and then locking the diff in the transfer with the second stick ?
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Offline Irish_Alley

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Re: NP203 Theory
« Reply #1 on: November 06, 2013, 01:35:58 am »
well i think one stick would be H or L. and the other stick would be your lock- unlock. so if you unlocked the hubs your good there then you just put the tcase in N your good there. but i have heard and seen a lift crane being towed. they just put it in N but the rear shaft still turned the transmission, but the pump wasnt turning so it burnt up the trans. thats not a cheap trans to replace
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Offline Cabcorner

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Re: NP203 Theory
« Reply #2 on: November 06, 2013, 06:19:35 am »
                        Well I could put the tranny in park , the transfer in neutral ,unlock the hubs and lock the diff in the transfer case .
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Offline Irish_Alley

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Re: NP203 Theory
« Reply #3 on: November 06, 2013, 11:02:47 pm »
the thing they had to do with the lift crane was remove the drive shaft
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Offline 75gmck25

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  • 1975 GMC K25 Camper Special, 350/TH350/NP203
Re: NP203 Theory
« Reply #4 on: December 25, 2013, 09:17:40 pm »
The owner's manual for my '75 GMC K25 with NP203 says it can be flat-towed with the transfer case in neutral and the transmission in park. It does not mention any speed or distance limits.

Bruce
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Offline scorpion

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Re: NP203 Theory
« Reply #5 on: December 30, 2013, 09:23:09 am »
Quote from: 75gmck25 on December 25, 2013, 09:17:40 pm
The owner's manual for my '75 GMC K25 with NP203 says it can be flat-towed with the transfer case in neutral and the transmission in park. It does not mention any speed or distance limits.

Bruce

What are you attempting to do/solve?  The front diff wouldn't spin (lockouts allow free spin of the hub assembly) but the transmission would still be spinning because the rear end would be spinning the rear yolk on the tcase.  When flat towing the ideal setup would allow all drivetrain components to not rotate which would be accomplished with rear lockouts like warn made for jeeps for that specific reason.  Any drivetrain component that spins during flat towing realizes the miles as if driven itself (though less load).
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Offline Irish_Alley

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Re: NP203 Theory
« Reply #6 on: December 31, 2013, 10:06:19 pm »
if i understand the autos right your not lubricating the parts and manuals idk
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When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes
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