AstroSafariVans.com

The premier site for Astro and Safari van information
It is currently Sat Nov 18, 2017 11:58 am

All times are UTC




Post new topic Reply to topic  [ 4 posts ] 
Author Message
 Post subject: Wiring the NP236
PostPosted: Fri Feb 05, 2016 3:04 am 
Offline
I am merely driving my van
I am merely driving my van

Joined: Tue Oct 07, 2008 12:30 am
Posts: 17
I have been searching around and reading all day, (needed something to do while recovering from the flu) and I did not come across useful info on the wiring part of a NP236 install, which by all accounts is the hard part. Am I missing something, or has nobody yet had the time/inclination to write it up?

I have been driving awd astro/safaris for the last 10 years or more, and now that my 2nd NP136 transfer case is going out on in my current rig despite being a costly remanufactured unit and frequent AT2 fluid changes, I need to make a quick decision whether to go for the dual-range or try to throw in a used stock case and go back to dreaming about a low range, but at least have my daily driver back. I happen to have a little extra money right now, which is not usually the case, and I have a shop and moderate wrenching skills. I am not afraid of attempting the work, but need guidance to get it done properly and in a timely fashion, like over a long weekend sort of thing.

I live in the mountains of northern California on top of a steep hill deal and my driveway is practically a jeep trail. We get a lot of snow here, and I love the AWD, but also use my van like a farm truck do a lot of back roads exploring and could actually use a low range option as there are many times when I am trying to do something with my van that it simply lacks the power/gearing to accomplish. As far as an electronically controlled x-fer case goes, I would think that everybody would want the 236. Yet few have tried it I presume due the wiring technicalities?

I understand that it is a very time consuming process to document this type of procedure, but maybe it is easier than it seems? Or maybe somebody has been sitting on the info and just needs a little motivation to post it?

Thanks to you all for this great resource.

_________________
Current Rig - 2004 Safari AWD, 200k+, OLV 2" lift blocks, SD Truck Springs S10 rear springs, tortion keys cranked, KYB monomax shocks, 3.73 gears, 235/70/16's, Next project, NP236 X-fer case, I have the case, now I just need the time and the courage to crack open that nut.
My First Safari, gone now - 1993 Safari AWD, 108K, 2" OLV Lift, 235/75R15 Tires, Rancho RS5000, 3.42 gears


Top
 Profile  
 
 Post subject: Re: Wiring the NP236
PostPosted: Fri Feb 05, 2016 9:45 am 
Offline
I sleep in my van

Joined: Wed Feb 01, 2012 8:10 pm
Posts: 392
Location: southeastern ct
First- I'm sorry for the delay. I've been plugging along when I've had the time but I'm still not done so...sorry bout that. And you're right about the wiring being the biggest part of the job. The rest of it is strictly bolt up so no hassles there.
If your changing tc's, throw in the 236 and use your 136 encoder motor. It will work just like a stock unit and when either racrx7 or myself actually get this written up all that will be left for you is the wiring to access low range. That's where I am right now.
Also, there is very little to go wrong inside these things so save your old one, buy a new chain and friction discs and your good to go. There's a thread for rebuilding the clutch pack.
I envy you living in terrain that wears out transfer cases. Here in Ct. I have to really go looking for any kind of offroad. I'm like a kid in a candy store when it snows and I can take my van and go out and play. It's snowing now and I get out of work in an hour!

_________________
Captn. Crunch
"I don't beat my rig-I use it to it's maximum potential"
1994 Safari conversion (sold) and miss'n it!
1999 Safari SLE AWD
np236 transfer case
Torsen rear w/3.73's
2" body lift
S-10 rear leafs
Torsen limited slip cast iron front diff
Coming soon:
Skid plates
Rock rails


Top
 Profile  
 
 Post subject: Re: Wiring the NP236
PostPosted: Fri Feb 05, 2016 5:33 pm 
Offline
I am merely driving my van
I am merely driving my van

Joined: Tue Oct 07, 2008 12:30 am
Posts: 17
Hey Captn.

Thanks for responding so quickly. You do not need to apologize. I say, "When the berry is ripe, it will fall in to your hand."

Your suggestion is super helpful!!! That gives me the best of both worlds, a solution for right now and a sure path to low-range when we collectively can put our heads together to figure it out.

I am going to go back and study all the relevant threads again today to hopefully get the most important details to stick. If I still have questions I hope you don't mind me picking your brain and relying on your experience a bit more.

Cheers.

_________________
Current Rig - 2004 Safari AWD, 200k+, OLV 2" lift blocks, SD Truck Springs S10 rear springs, tortion keys cranked, KYB monomax shocks, 3.73 gears, 235/70/16's, Next project, NP236 X-fer case, I have the case, now I just need the time and the courage to crack open that nut.
My First Safari, gone now - 1993 Safari AWD, 108K, 2" OLV Lift, 235/75R15 Tires, Rancho RS5000, 3.42 gears


Top
 Profile  
 
 Post subject: Re: Wiring the NP236
PostPosted: Sun Feb 07, 2016 1:02 am 
Offline
I finally get the smurf thing

Joined: Sun Jul 26, 2015 8:25 pm
Posts: 127
Location: Charleston SC
Image

Use this switch from a 2000 and earlier Suburban/Tahoe, if you can. Any of the 4 button switches will work, but they will be difficult to mount due to their odd shapes. Dormant makes a replacement switch pictured, http://www.amazon.com/dp/B00A14O8LC/ref=wl_it_dp_o_pd_nS_ttl?_encoding=UTF8&colid=1EFO94C1PCKI&coliid=IGJGTYT4EP6US , that is supposed to be better than the OEM one. You will have to do some re pinning of the wires to it, but you will be re pinning the TCCM also.

Image

The top connector is our factory connector. The lower one is from the 236 donor vehicle. It uses the came wires as the 136, but obviously adds more wires from the encoder, switch and front axle dissconnect circuits. You will transfer these extra wires to your existing 136 connector. You'll notice two black ground wires in the 136 connector, (upper far left pins), and only one used in the 236 connector. I removed the second from the left and taped it up. It's not used in the 236 setup and I have no way to verify if it will or won't damage the TCCM if left in the circuit. It works perfect with the one ground wire.

_________________
O3 Astro 4X4
Image
Dropped front IFS axle
Journeys rear spring hangers and shackles, S-10 leaf springs, 2" body lift
255/70-16 BFG KO2's on 16x8 Fuel Revolvers


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 4 posts ] 

All times are UTC


Who is online

Users browsing this forum: No registered users and 4 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group