How to Identify Transfer Case? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

moodyholler · 12-30-2003, 10:18 PM

Guy here in town is trying to sell me a running gear out of a 1970 blazer. Springs, front and rear diff's,(3.73) non-posi,th350 and what he says is a dana 20 transfer. How do I identify it? I remember my 70 had a funny semi circular shift pattern for the 4 wheel drive, but there is no shifter that I am aware of on this rig. ANy help? His old blazer was an 307, th350,ps and pb.moodyholler

earl87gta · 12-31-2003, 02:20 AM

if its a stock blazer case it should be a 205 if you go to advanced adaptors web site they have the best transfer case identification page Ive ever seen.

Davy · 12-31-2003, 12:04 PM

My Dana 20 says "Dana 20" on the back...just to the right of the rear drive shaft.....if I remember correctly.

But like Earl said, if it was factory auto TH350 and true 1970, it should have a NP205

Davy

69k5 · 12-31-2003, 03:02 PM

look on the back side in the middle. if there is a round cover withe 3 bolts in it its a 205. should be about 2" round or so

bouncytruck · 12-31-2003, 03:24 PM

The NP205 sshuld have a plate on it also. They are bigger than the Dana 20 as well. If it was an original TH350, I believe it should be the 205. Dana 20s were put behind the 3 speed column shifts, but Chevy wasn't overy consistant with these trucks so it could be anything.

12-30-2003, 10:18 PM	#1
moodyholler Registered User Join Date: Dec 2003 Location: Roanoke,Virginia Posts: 179	How to Identify Transfer Case? Guy here in town is trying to sell me a running gear out of a 1970 blazer. Springs, front and rear diff's,(3.73) non-posi,th350 and what he says is a dana 20 transfer. How do I identify it? I remember my 70 had a funny semi circular shift pattern for the 4 wheel drive, but there is no shifter that I am aware of on this rig. ANy help? His old blazer was an 307, th350,ps and pb.moodyholler __________________ 1998 WRANGLER I-6 auto 1972 LWB FLEETSIDE 1968 GMC SWB STEPSIDE 1994 C-1500 SWB 4.3 5 SPD

12-31-2003, 02:20 AM	#2
earl87gta Senior Member Join Date: Dec 2003 Location: Kingsport TN Posts: 4,641	if its a stock blazer case it should be a 205 if you go to advanced adaptors web site they have the best transfer case identification page Ive ever seen. __________________ Earl 68 2500 4x4 GMC Burb

12-31-2003, 12:04 PM	#3
Davy Registered User Join Date: Apr 2003 Location: Rice, Minnesota Posts: 370	My Dana 20 says "Dana 20" on the back...just to the right of the rear drive shaft.....if I remember correctly. But like Earl said, if it was factory auto TH350 and true 1970, it should have a NP205 Davy __________________ 1970 Blazer CST Looking for NOS items for my CST restoration. Last edited by Davy; 12-31-2003 at 12:06 PM.

12-31-2003, 03:24 PM	#5
bouncytruck SKINNY TIRES RULE! Join Date: Sep 2001 Location: Bothell, WA Posts: 11,038	The NP205 sshuld have a plate on it also. They are bigger than the Dana 20 as well. If it was an original TH350, I believe it should be the 205. Dana 20s were put behind the 3 speed column shifts, but Chevy wasn't overy consistant with these trucks so it could be anything. __________________ bouncytruck 1972 K5 The Hauler 1994 K1500 Suburban The Daily2010 Kia Soul Wife's Ride2014 Fiat 500L

12-31-2003, 03:02 PM	#4
69k5 Registered User Join Date: Nov 2003 Location: Monroe, La 71202 Posts: 317	look on the back side in the middle. if there is a round cover withe 3 bolts in it its a 205. should be about 2" round or so



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