77 chevy cast iron transfer case - The 1947 - Present Chevrolet & GMC Truck Message Board Network

J Williams · 02-12-2015, 04:00 PM

Can anyone tell me what is so special about this transmission. I have been told it is worth a chunk of change to rock crawlers. I have one that everyone keeps telling me there is a market for it but I have yet to find anyone that wants to buy it. This is not a post to sell it. It is just an information inquiry to see what is so special about it. Thanks for your time.

enaberif · 02-12-2015, 06:20 PM

Uhm... NP203 or NP205? The NP203 can be doubled to the NP205 but other than that eh nothing special.

whiskeydented · 02-12-2015, 08:04 PM

If it's a 203 that's behind a turbo 400 it could be worth something. I've sold some of those for a few bills.

andrewmp6 · 02-13-2015, 09:50 AM

If its a np205 that is the one everyone wants,If if its the np203 its only good to build a doubler out of really.Look on the t case for a tag or post a picture of it from the rear we can id it.

Damien · 02-14-2015, 07:11 PM

The NP205 is a gear drive unit that off road guys like for it's strength. The NP203 is a chain drive unit and as stated above can be used to make a "doubler" for further gear reduction. The NP203 and NP205 have low range gear ratios of about 2:1. A double will have a low range of about 4:1. The spline count for the TH350 and TH400 versions of the NP203 are different and I think it is the TH400 version that is used for the doubler.

02-12-2015, 04:00 PM	#1
J Williams Registered User Join Date: Jun 2014 Location: Paul idaho Posts: 263	77 chevy cast iron transfer case Can anyone tell me what is so special about this transmission. I have been told it is worth a chunk of change to rock crawlers. I have one that everyone keeps telling me there is a market for it but I have yet to find anyone that wants to buy it. This is not a post to sell it. It is just an information inquiry to see what is so special about it. Thanks for your time. __________________ 63 C10

02-12-2015, 06:20 PM	#2
enaberif Registered User Join Date: Jan 2009 Location: Calgary, AB Posts: 1,181	Re: 77 chevy cast iron transfer case Uhm... NP203 or NP205? The NP203 can be doubled to the NP205 but other than that eh nothing special.

02-12-2015, 08:04 PM	#3
whiskeydented Registered User Join Date: Dec 2006 Location: connecticut Posts: 261	Re: 77 chevy cast iron transfer case If it's a 203 that's behind a turbo 400 it could be worth something. I've sold some of those for a few bills.

02-13-2015, 09:50 AM	#4
andrewmp6 Registered User Join Date: Jan 2009 Location: Louisville,Ky Posts: 5,811	Re: 77 chevy cast iron transfer case If its a np205 that is the one everyone wants,If if its the np203 its only good to build a doubler out of really.Look on the t case for a tag or post a picture of it from the rear we can id it.

02-14-2015, 07:11 PM	#5
Damien Registered User Join Date: Mar 2007 Location: Farmington, MN Posts: 928	Re: 77 chevy cast iron transfer case The NP205 is a gear drive unit that off road guys like for it's strength. The NP203 is a chain drive unit and as stated above can be used to make a "doubler" for further gear reduction. The NP203 and NP205 have low range gear ratios of about 2:1. A double will have a low range of about 4:1. The spline count for the TH350 and TH400 versions of the NP203 are different and I think it is the TH400 version that is used for the doubler. __________________ I can still count my vehicles on two... wait three hands.



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