73-87chevytrucks.com

73-87 Chevy _ GMC Trucks => 4 Wheel Drives => Transfer Cases and Front Drivelines => Topic started by: elijahcollins688 on April 29, 2018, 09:25:10 PM

Title: 4wd
Post by: elijahcollins688 on April 29, 2018, 09:25:10 PM

Hi, my truck has a 4wd shifter that looks like this (https://uploads.tapatalk-cdn.com/20180430/624e6d0562648e619cd305599e5670b2.jpg) I’m not sure if I can drive it in 2wd or if it is full time 4wd


Sent from my iPhone using Tapatalk

Title: Re: 4wd
Post by: 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.

Sent from my SM-S920L using Tapatalk

Title: Re: 4wd
Post by: VileZambonie 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

Title: Re: 4wd
Post by: 75gmck25 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

Title: Re: 4wd
Post by: ehjorten 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.

Title: Re: 4wd
Post by: 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.

Title: Re: 4wd
Post by: 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! ;)

Title: Re: 4wd
Post by: Irish_Alley 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

Title: Re: 4wd
Post by: elijahcollins688 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.

Sent from my SM-S920L using Tapatalk

Okay, thanks for the info.


Sent from my iPhone using Tapatalk