Identifying P.T.O. housing set up - The 1947 - Present Chevrolet & GMC Truck Message Board Network

tylerdurden · 01-09-2006, 02:59 PM

I have a 76' 3/4 ton automatic GMC long bed with full time 4wd as a donar vehicle. Iam putting the drivetrain into my 88' 1/2 superban. I plan on running a 78' 454 engine with a 99' multiport efi set up. and using the original 700R4 which has been rebuilt
My question is, what is the housing (w/pto option) that is behind the TH350 and in front of the transfer case; np205 (I think)? It looks all oem set up. I have asked several people in my area but nobody knows what it is or they say they have never seen anything like it. I would like to find out what is and its proper name, so as to find a adapator for the 700R4.
I would like to find a P.T.O. for it, and use that as my rear winch set up.
Whats do the letters P.T.O. mean, I know its a device that tranfers mechical power to a pump for a hydraulic system.

Blazer1970 · 01-09-2006, 06:32 PM

That is just the front part of the NP203 transfer case. It is the high/low range section. If the donor truck has a TH350, the same adapter will work with the TH700R4 as was used with the TH350. If the '76 has a TH400, the t-case will not work with your 700R4 since it will have a 32 spline input, and you need the 27 spline version that is used with the TH350. I believe that the output shaft on the 700R4 is longer than the TH350 shaft, so you either have to use a spacer between the trans and t-case, or use an aftermarket output shaft for the 700R4 (from Advanced Adapters), or cut off the end of the shaft. It would be easier to use the tranny from the '76, but no O/D.

rwgregory · 01-10-2006, 03:57 AM

P.T.O. stands for "power take off ", (you are actually taking power from the
engine and using it for another purpose).

us111 · 01-10-2006, 11:49 AM

almost sounds like my np203 without the front drive shaft hooked up??
is it on the passenger side of vehicle and front of transfer case???
just a thought..

tylerdurden · 01-12-2006, 03:30 PM

Thanks gentlemen, for your help. I just wanted to know for a fact what I had, when I start to talk to the folks of Advanced Adapters. us111 the P.T.O cover is on the drivers side and the front output shaft is on the passenger side.

us111 · 01-12-2006, 09:23 PM

ah,ok,,just learning about 203's myself..

01-09-2006, 02:59 PM	#1
tylerdurden Registered User Join Date: Sep 2005 Location: Austin, TX Posts: 20	Identifying P.T.O. housing set up I have a 76' 3/4 ton automatic GMC long bed with full time 4wd as a donar vehicle. Iam putting the drivetrain into my 88' 1/2 superban. I plan on running a 78' 454 engine with a 99' multiport efi set up. and using the original 700R4 which has been rebuilt My question is, what is the housing (w/pto option) that is behind the TH350 and in front of the transfer case; np205 (I think)? It looks all oem set up. I have asked several people in my area but nobody knows what it is or they say they have never seen anything like it. I would like to find out what is and its proper name, so as to find a adapator for the 700R4. I would like to find a P.T.O. for it, and use that as my rear winch set up. Whats do the letters P.T.O. mean, I know its a device that tranfers mechical power to a pump for a hydraulic system.

01-09-2006, 06:32 PM	#2
Blazer1970 Registered User Join Date: Dec 1999 Location: Old Mission, MI, USA Posts: 2,510	Re: Identifying P.T.O. housing set up That is just the front part of the NP203 transfer case. It is the high/low range section. If the donor truck has a TH350, the same adapter will work with the TH700R4 as was used with the TH350. If the '76 has a TH400, the t-case will not work with your 700R4 since it will have a 32 spline input, and you need the 27 spline version that is used with the TH350. I believe that the output shaft on the 700R4 is longer than the TH350 shaft, so you either have to use a spacer between the trans and t-case, or use an aftermarket output shaft for the 700R4 (from Advanced Adapters), or cut off the end of the shaft. It would be easier to use the tranny from the '76, but no O/D. __________________ Tim

01-10-2006, 03:57 AM	#3
rwgregory Registered User Join Date: Apr 2005 Location: Chula Vista, California Posts: 495	Re: Identifying P.T.O. housing set up P.T.O. stands for "power take off ", (you are actually taking power from the engine and using it for another purpose). __________________ rwgregory 67 GMC 2500 ,2w/d wide box 305 V-6, 4-speed

01-10-2006, 11:49 AM	#4
us111 Registered User Join Date: Jul 2004 Location: ashland oh Posts: 660	Re: Identifying P.T.O. housing set up almost sounds like my np203 without the front drive shaft hooked up?? is it on the passenger side of vehicle and front of transfer case??? just a thought..

01-12-2006, 03:30 PM	#5
tylerdurden Registered User Join Date: Sep 2005 Location: Austin, TX Posts: 20	Re: Identifying P.T.O. housing set up Thanks gentlemen, for your help. I just wanted to know for a fact what I had, when I start to talk to the folks of Advanced Adapters. us111 the P.T.O cover is on the drivers side and the front output shaft is on the passenger side.

01-12-2006, 09:23 PM	#6
us111 Registered User Join Date: Jul 2004 Location: ashland oh Posts: 660	Re: Identifying P.T.O. housing set up ah,ok,,just learning about 203's myself..



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