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Author Topic: 4wd  (Read 5377 times)

Offline elijahcollins688

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4wd
« on: April 29, 2018, 09:25:10 PM »
Hi, my truck has a 4wd shifter that looks like this I’m not sure if I can drive it in 2wd or if it is full time 4wd


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Offline 1967KaiserM715

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Re: 4wd
« Reply #1 on: April 30, 2018, 04:40:07 AM »
Np203, run it in H, Hloc will be full time 4wd, H is essentially part time 4wd, and will be easier to turn on pavement.

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Current Vehicles:1985 GMC K10(Daily) 1991 GMC K2500(Daily) 1975 Beetle(not running) 1985 Mercedes 300D(not running) 1952 M35    1967 M715(not running)
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Offline VileZambonie

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Re: 4wd
« Reply #2 on: April 30, 2018, 07:18:05 AM »
If you want true 2WD mode you need to buy this kit https://www.summitracing.com/parts/mmk-502/overview/ and convert it
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Offline 75gmck25

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Re: 4wd
« Reply #3 on: May 01, 2018, 04:46:24 PM »
If it already has front locking hubs (switchable), it may have already been converted to part time with the kit mentioned.  If it still has the stock full-time front hubs (no switch), its probably still a stock NP203.

The stock NP203 is very durable, but if its been converted to part time it  may suffer rom insufficient oiling.  There is an internal oil pump that only runs in 4WD, and if you leave it in the 2WD position it does not circulate oil properly.  The part time conversion kit directions suggest running it in 4WD at least once a week, but most folks don't read and keep directions.

Bruce

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Offline ehjorten

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Re: 4wd
« Reply #4 on: May 03, 2018, 08:36:11 AM »
If you have selectable front hubs, when they are unlocked and you can still drive, then it has been converted to part time.  Additionally...if they are unlocked and you are in High, you should be able to freely rotate your front driveshaft, if it has been converted.
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-Erik-
1991 V3500 - Gen V TBI 454, 4L80E, NP205, 14 bolt FF, D60, 8" Lift on 35s
1977 K20 Silverado - 350, THM350, NP203, 14 bolt FF, D44, Stock Lift on 31s
1969 Chevelle Malibu Sport Coupe - EFI350, THM350
1968 Chevrolet Step-side Pickup - 300HP L6

Offline Irish_Alley

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Re: 4wd
« Reply #5 on: May 04, 2018, 07:16:24 AM »
Quote from: ehjorten on May 03, 2018, 08:36:11 AM
If you have selectable front hubs, when they are unlocked (and if youre in 4 HI not "4 loc") and you can still drive, then it has been converted to part time.  Additionally...if they are unlocked and you are in High, you should be able to freely rotate your front driveshaft, if it has been converted.

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If you can’t tell yourself the truth, who can you tell it to?~Irish_Alley

When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes

Offline ehjorten

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Re: 4wd
« Reply #6 on: May 04, 2018, 01:53:59 PM »
Quote from: Irish_Alley on May 04, 2018, 07:16:24 AM
Quote from: ehjorten on May 03, 2018, 08:36:11 AM
If you have selectable front hubs, when they are unlocked (and if youre in 4 HI not "4 loc") and you can still drive, then it has been converted to part time.  Additionally...if they are unlocked and you are in High, you should be able to freely rotate your front driveshaft, if it has been converted.
Irish...you mean...and you are in H or L and not H-loc or L-loc! ;)
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-Erik-
1991 V3500 - Gen V TBI 454, 4L80E, NP205, 14 bolt FF, D60, 8" Lift on 35s
1977 K20 Silverado - 350, THM350, NP203, 14 bolt FF, D44, Stock Lift on 31s
1969 Chevelle Malibu Sport Coupe - EFI350, THM350
1968 Chevrolet Step-side Pickup - 300HP L6

Offline Irish_Alley

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Re: 4wd
« Reply #7 on: May 04, 2018, 02:06:25 PM »
Quote from: ehjorten on May 04, 2018, 01:53:59 PM
Quote from: Irish_Alley on May 04, 2018, 07:16:24 AM
Quote from: ehjorten on May 03, 2018, 08:36:11 AM
If you have selectable front hubs, when they are unlocked (and if youre in 4 HI not "4 loc") and you can still drive, then it has been converted to part time.  Additionally...if they are unlocked and you are in High, you should be able to freely rotate your front driveshaft, if it has been converted.
Irish...you mean...and you are in H or L and not H-loc or L-loc! ;)

big 10-4
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If you can’t tell yourself the truth, who can you tell it to?~Irish_Alley

When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes

Offline elijahcollins688

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Re: 4wd
« Reply #8 on: May 05, 2018, 09:53:25 AM »
Quote from: 1967KaiserM715 on April 30, 2018, 04:40:07 AM
Np203, run it in H, Hloc will be full time 4wd, H is essentially part time 4wd, and will be easier to turn on pavement.

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Okay, thanks for the info.


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