dana 20 vs. np205 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

shelby987 · 02-14-2006, 11:58 AM

looking at a possible transmission upgrade, and I wanted to see if the dana 20 and np205 have any dimensional or spline count differences that would mean that switching to a 4 spd from a 3 spd would mean I have to swap my current transfer case out. (looking to go from a 3 spd saginaw to a 4 spd saginaw)
Also, if it appears I have to swap my dana 20 for an NP205, will I have driveshaft length issues?
What is the input spline count for these two transfer cases?

**Yukon Jack** · 02-14-2006, 12:36 PM

I do know that your transfer case crossmember will need to be dropped down about 1 inch to give the NP205 clearance. If you don't it will hit the bottom of the floor. Can't speak to the rest of your questions.

Americanrider · 02-14-2006, 01:41 PM

205 Spline input counts for:
th350 = 27
SM465 = 10
Th400 = 32

JAKES 68GMC · 02-14-2006, 05:08 PM

I think you'd be happier with a granny-gear 4-speed rather than a Saginaw. SM-420, SM-465 and NP-435 are common in old Chevys. I dont think they make transfer case adapters for a Sagina, anyway.

1969 GMC · 02-14-2006, 07:02 PM

the D20 uses a 10 spline input and a crappy sleeve, just like the 465/205.

02-14-2006, 11:58 AM	#1
shelby987 Registered User Join Date: Mar 2005 Location: Just outside Durham, NC Posts: 894	dana 20 vs. np205 looking at a possible transmission upgrade, and I wanted to see if the dana 20 and np205 have any dimensional or spline count differences that would mean that switching to a 4 spd from a 3 spd would mean I have to swap my current transfer case out. (looking to go from a 3 spd saginaw to a 4 spd saginaw) Also, if it appears I have to swap my dana 20 for an NP205, will I have driveshaft length issues? What is the input spline count for these two transfer cases? __________________ 1969 SS 350 Camaro Sold 2008 1970 3/4T K20, stock height with 33's, 250 I6, 3 on the tree, and locked front and rear 4.10's 1980 Chevy Malibu 2 dr Sold 2007 1993 Olds. Cutlass Ciera Wagon Traded 2006 2003 Saturn L200 w/5pd. D/D My list spans 5 decades with One common thread.....GM!

02-14-2006, 12:36 PM	#2
Yukon Jack Post Whore Join Date: Feb 2000 Location: Rose Hill, KS, USA Posts: 12,683	Re: dana 20 vs. np205 I do know that your transfer case crossmember will need to be dropped down about 1 inch to give the NP205 clearance. If you don't it will hit the bottom of the floor. Can't speak to the rest of your questions. __________________ 1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14

02-14-2006, 01:41 PM	#3
Americanrider Registered User Join Date: Dec 2004 Location: NW, WA. Posts: 1,421	Re: dana 20 vs. np205 205 Spline input counts for: th350 = 27 SM465 = 10 Th400 = 32

02-14-2006, 05:08 PM	#4
JAKES 68GMC Aluminum slot wheels rule... Join Date: Jan 2006 Location: Maine Posts: 6,212	Re: dana 20 vs. np205 I think you'd be happier with a granny-gear 4-speed rather than a Saginaw. SM-420, SM-465 and NP-435 are common in old Chevys. I dont think they make transfer case adapters for a Sagina, anyway.

02-14-2006, 07:02 PM	#5
1969 GMC Registered User Join Date: Feb 2003 Location: The Rubber City Posts: 5,498	Re: dana 20 vs. np205 the D20 uses a 10 spline input and a crappy sleeve, just like the 465/205. __________________ 1969 GMC K2500 1996 Honda Accord 2007 Kawasaki KLR 650



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