79 Gmc 3500 Srw - Np203? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

crosby · 10-29-2006, 05:26 PM

Hi guys, I am in the process of buying a 79 GMC one ton for parts. It has a dana 60 front, 14 bolt SRW rear. I looked at the xfer case, and it looks like a 203, not a 205 like I would expect. Shouldn't it have a 205? How can I id the tranny? I think it's a TH400, kind of looks like Illinois, right? But TH350s look like a square with one corner cut off, right? Thanks very much for your help.

Jeff

1Ton · 10-30-2006, 09:03 AM

Another good way to ID a T400 is the vacuum modulator is towards the pass front. T350 is to the rear.

Jonboy · 10-30-2006, 10:06 AM

IIRC, all of the 4wd trucks with autos got the 203 case until '79, and all standards got the 205. In 80, all 4wd trucks got the 205 case, and then the half tons (at least) went to the 208 case.

magnethead · 10-30-2006, 06:18 PM

another way to check for the NP 203 is engage the front hubs and try to turn. (plus lack of a 2wd-4wd shifter)

79Silv4x4 · 10-30-2006, 08:54 PM

In '79 the NP205 was only available in manual tranny equipped trucks (I think).

10-29-2006, 05:26 PM	#1
crosby Registered User Join Date: Aug 2004 Location: New Hampshire Posts: 437	79 Gmc 3500 Srw - Np203? Hi guys, I am in the process of buying a 79 GMC one ton for parts. It has a dana 60 front, 14 bolt SRW rear. I looked at the xfer case, and it looks like a 203, not a 205 like I would expect. Shouldn't it have a 205? How can I id the tranny? I think it's a TH400, kind of looks like Illinois, right? But TH350s look like a square with one corner cut off, right? Thanks very much for your help. Jeff __________________ Crosby 1978 Chevrolet K10 stepside NH

10-30-2006, 09:03 AM	#2
1Ton Registered User Join Date: Nov 2004 Location: Jamestown NY Posts: 731	Re: 79 Gmc 3500 Srw - Np203? Another good way to ID a T400 is the vacuum modulator is towards the pass front. T350 is to the rear. __________________ Support your local search and rescue team.... GET LOST! Originally Posted by DURRTY if some is good more is better too much ought to be enough........

10-30-2006, 10:06 AM	#3
Jonboy Slots go on anything! Join Date: May 2003 Location: Richardson, TX Posts: 5,957	Re: 79 Gmc 3500 Srw - Np203? IIRC, all of the 4wd trucks with autos got the 203 case until '79, and all standards got the 205. In 80, all 4wd trucks got the 205 case, and then the half tons (at least) went to the 208 case.

10-30-2006, 06:18 PM	#4
magnethead 7000 #'s of american IRON Join Date: Dec 2004 Location: north tx Posts: 883	Re: 79 Gmc 3500 Srw - Np203? another way to check for the NP 203 is engage the front hubs and try to turn. (plus lack of a 2wd-4wd shifter)

10-30-2006, 08:54 PM	#5
79Silv4x4 Workaholic Join Date: Oct 2002 Location: Katy, TX Posts: 1,589	Re: 79 Gmc 3500 Srw - Np203? In '79 the NP205 was only available in manual tranny equipped trucks (I think).



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