NP205 vs Dana 20 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

72armyswbtruck · 12-30-2008, 03:48 AM

Ok, So I just got some original literature on the 70 3/4 ton GMC NP 205 and it says that the standard transfer case for a 4 speed manual was the
DANA 20, what gives, How come I have been on this board and around these trucks for years and just now found this out.
What info can everyone provide on the Dana 20 transfer case?
Thanks
Army

jcnalley · 12-30-2008, 06:14 AM

http://www.novak-adapt.com/knowledge/model_20.htm

**special-K** · 12-30-2008, 06:53 AM

That info you saw is inaccurate.Even if the Dana20 may possibly have found it`s way into a few trucks or Suburbans,they were only mated to a 3spd.I`ve seen 3 spd Blazers,but the Dana20 wasn`t used behind 4spds.Jeeps and Brocos never came with 4spds.You`d have to go to Advance Adaptors for a kit to do 4spd/model 20 swap.
I think that info is for Blazers.There was no "option" when it came to transfer cases.That was determined by the transmission.The standard 4wd transmission was the 3spd.So,the standard transfer case in a Blazer was the model 20.There may be an acception,but the 3spd trucks and Suburbans I`ve seen had the NP 205 transfer case.

Blazer1970 · 12-30-2008, 08:16 AM

The Dana 20 was only used in Blazers/Jimmys, and it definitely was used behind the SM465. I have seen pictures of several over the years. That said, I parted out a '72 Blazer that came with a 465/205 so maybe the 465/D20 was '69 - '70 only or something like that.

Old Chevy Mech · 12-30-2008, 08:33 AM

Quote:

Originally Posted by Blazer1970

The Dana 20 was only used in Blazers/Jimmys, and it definitely was used behind the SM465. I have seen pictures of several over the years. That said, I parted out a '72 Blazer that came with a 465/205 so maybe the 465/D20 was '69 - '70 only or something like that.

Could be I know that the 70 Jimmy we had had a 20 and a 3speed in it. When I got mt 70 K-5 it came with the 20 and the SM465 from the factory, bit was spec'd out to have the 4speed tranny.

Frank

**Yukon Jack** · 12-30-2008, 12:36 PM

My 70 K5 was a factory SM465 4 speed with Dana 20 case. It now has the NP205.

1969 GMC · 12-30-2008, 11:01 PM

The dana 20 was actually offered for a few years in the 73+ body style, also. I have seen a few of the full convertibles (73-75?) with it behind the 3 speed or SM465. Interestingly it was also these few years when you could get the factory 465/203 combo, seen a couple of those as well.

72armyswbtruck · 12-30-2008, 11:25 PM

So, what are the real differences between the NP205 and the Dana 20?
The literature that I have is Chevy Service Guide titled "The New Process Transfer Case" it covers the rebuild of the NP transfer case. It says The Chevrolet K/5 Blazer models are equipped with two types of transfer cases-- the Dana or the New Process. The Dana 20 is used with manual transmissions.
So now the question is:
What are the differences and how come not that many Dana 20's are preferred?

72armyswbtruck · 12-30-2008, 11:29 PM

Scratch that, excellent link lots of knoweldge and info.

12-30-2008, 03:48 AM	#1
72armyswbtruck Registered User Join Date: Feb 2004 Location: Idaho Posts: 4,033	NP205 vs Dana 20 Ok, So I just got some original literature on the 70 3/4 ton GMC NP 205 and it says that the standard transfer case for a 4 speed manual was the DANA 20, what gives, How come I have been on this board and around these trucks for years and just now found this out. What info can everyone provide on the Dana 20 transfer case? Thanks Army __________________ "Remember, They can Kill You, but they can't eat You, That's against the law!!!!!!!!!"

12-30-2008, 06:14 AM	#2
jcnalley Registered User Join Date: Jul 2007 Location: Rockingham,NC Posts: 31	Re: NP205 vs Dana 20 http://www.novak-adapt.com/knowledge/model_20.htm

12-30-2008, 06:53 AM	#3
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: NP205 vs Dana 20 That info you saw is inaccurate.Even if the Dana20 may possibly have found it`s way into a few trucks or Suburbans,they were only mated to a 3spd.I`ve seen 3 spd Blazers,but the Dana20 wasn`t used behind 4spds.Jeeps and Brocos never came with 4spds.You`d have to go to Advance Adaptors for a kit to do 4spd/model 20 swap. I think that info is for Blazers.There was no "option" when it came to transfer cases.That was determined by the transmission.The standard 4wd transmission was the 3spd.So,the standard transfer case in a Blazer was the model 20.There may be an acception,but the 3spd trucks and Suburbans I`ve seen had the NP 205 transfer case. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

12-30-2008, 08:16 AM	#4
Blazer1970 Registered User Join Date: Dec 1999 Location: Old Mission, MI, USA Posts: 2,507	Re: NP205 vs Dana 20 The Dana 20 was only used in Blazers/Jimmys, and it definitely was used behind the SM465. I have seen pictures of several over the years. That said, I parted out a '72 Blazer that came with a 465/205 so maybe the 465/D20 was '69 - '70 only or something like that. __________________ Tim

12-30-2008, 12:36 PM	#6
Yukon Jack Post Whore Join Date: Feb 2000 Location: Rose Hill, KS, USA Posts: 12,689	Re: NP205 vs Dana 20 My 70 K5 was a factory SM465 4 speed with Dana 20 case. It now has the NP205. __________________ 1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14

12-30-2008, 11:01 PM	#7
1969 GMC Registered User Join Date: Feb 2003 Location: The Rubber City Posts: 5,498	Re: NP205 vs Dana 20 The dana 20 was actually offered for a few years in the 73+ body style, also. I have seen a few of the full convertibles (73-75?) with it behind the 3 speed or SM465. Interestingly it was also these few years when you could get the factory 465/203 combo, seen a couple of those as well. __________________ 1969 GMC K2500 1996 Honda Accord 2007 Kawasaki KLR 650

12-30-2008, 11:25 PM	#8
72armyswbtruck Registered User Join Date: Feb 2004 Location: Idaho Posts: 4,033	Re: NP205 vs Dana 20 So, what are the real differences between the NP205 and the Dana 20? The literature that I have is Chevy Service Guide titled "The New Process Transfer Case" it covers the rebuild of the NP transfer case. It says The Chevrolet K/5 Blazer models are equipped with two types of transfer cases-- the Dana or the New Process. The Dana 20 is used with manual transmissions. So now the question is: What are the differences and how come not that many Dana 20's are preferred? __________________ "Remember, They can Kill You, but they can't eat You, That's against the law!!!!!!!!!"

12-30-2008, 11:29 PM	#9
72armyswbtruck Registered User Join Date: Feb 2004 Location: Idaho Posts: 4,033	Re: NP205 vs Dana 20 Scratch that, excellent link lots of knoweldge and info. __________________ "Remember, They can Kill You, but they can't eat You, That's against the law!!!!!!!!!"

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