67-72-----4x4 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**tjc** · 03-23-2015, 03:59 PM

when it comes to running gear (transfer case ) were they all the same or was one year better than the other?

Thanks Tom from Iowa.

71swb4x4 · 03-23-2015, 04:06 PM

I believe the np205 transfer case was in most 1969's and all 1970-1972's.
The transfer case before that was the Rockwell t221.
In a lot of people opinions the 205 is the superior transfer case.

SS Tim · 03-23-2015, 04:41 PM

71-72 with the NP205 transfer case and disc brake, open knuckle front axle is probably the best choice.

truckster · 03-23-2015, 05:02 PM

Quote:

Originally Posted by SS Tim

71-72 with the NP205 transfer case and disc brake, open knuckle front axle is probably the best choice.

I agree. The NP205 is as heavy as a tank, but it's as solid as one too.

And the open knuckles are great. My 72 Blazer turns tighter circles than my 95 Z28.

**68350** · 03-23-2015, 05:52 PM

The 205 in my opinion is the best transfer case they have made. Its basically rock solid and indestructible for most applications.

57taskforce · 03-23-2015, 07:32 PM

Quote:

Originally Posted by 68350

The 205 in my opinion is the best transfer case they have made. Its basically rock solid and indestructible for most applications.

+1 best oe supplied case ever made. Cast iron gear drive bliss

I guess the only complaint some have is the not so low, low range but you can't break them.

**tjc** · 03-23-2015, 08:00 PM

can you put the 205 in a 68

**CUSTOM/10** · 03-23-2015, 08:35 PM

Absolutely, but there are different versions. Auto, standard, 1/2 ton, one ton in later model trucks, slip yoke rear in later blazers. You just need to know what you plan on doing and get the correct version for your application ! Also the correct adapter, and 205 crossmember !

Gary

Vintage Windmills · 03-23-2015, 08:46 PM

The all gear rockwell T221 used through 69 is probably just as strong as the np205 but its harder to get parts for.

Vintage Windmills · 03-23-2015, 08:47 PM

Quote:

Originally Posted by 57taskforce

+1 best oe supplied case ever made. Cast iron gear drive bliss

I guess the only complaint some have is the not so low, low range but you can't break them.

Just need a SM465 or SM 420 and it will go slower than you can walk!

57taskforce · 03-23-2015, 10:54 PM

Quote:

Originally Posted by Vintage Windmills

Just need a SM465 or SM 420 and it will go slower than you can walk!

Yes sir that is exactly right. I personally don't have complaints on the 205 low range but know some do, thus the 205/203 doubler. It's low enough for everything I need it to do in stock form.

**special-K** · 03-24-2015, 10:19 AM

Quote:

Originally Posted by Vintage Windmills

Just need a SM465 or SM 420 and it will go slower than you can walk!

Absolutely correct. Every year was available with a bulletproof transfer case. Very few had the inferior Dana20, and only in some 3spds, which is also a lame transmission for 4wd application. if you swap, do yourself a favor and get the whole ball of wax. as far as I know only '69 Blazers got the NP205 and '70 was the first year for the full line. All '70s had open knuckle front axle,too. When the axle changed to open knuckle, so did the steering. all this interchanges as well. You can also just as easily swap front end, steering, and transfer case/transmission combos from any later solid axle GM 4wd. 2:1 is as low of gearing I have evr needed. I don't drive on boulders. That's what legs are made for

**tjc** · 03-24-2015, 01:47 PM

I found a 72 1/2 ton with auto and cast iron transfer case, would that be original to 72

**CUSTOM/10** · 03-24-2015, 02:40 PM

If it's original it would be a TH350 & NP205. If nothing has been changed, and it's a 72 !

Gary

swamp rat · 03-25-2015, 02:23 AM

Quote:

Originally Posted by tjc

I found a 72 1/2 ton with auto and cast iron transfer case, would that be original to 72

Just google NP205 (New Process 205) and hit images, you should find plenty of pic's to help you identify. Be aware there is subtle differences in an NP205 and an NP203 on the case.

My 72 is a 350/350 with a NP205, standard equipment.

burnin oil · 03-25-2015, 07:34 AM

The 205 is a beast but it is not the strongest. The bearing supports are aluminum so it will flex under a lot of torque. Sled pullers blow the crap out of them. The newer NP271/273 case is a lot stronger than the 205. The 205 is very adequate for most applications though.

johnw893 · 03-25-2015, 11:58 AM

The rockwell is about the toughest you can get but loud loud (straight cut gears) just don't run them low on oil

03-23-2015, 03:59 PM	#1
tjc Senior Member Join Date: Jun 2011 Location: burlington,iowa Posts: 439	67-72-----4x4 when it comes to running gear (transfer case ) were they all the same or was one year better than the other? Thanks Tom from Iowa.

03-23-2015, 04:06 PM	#2
71swb4x4 Senior Member Join Date: Nov 2003 Location: Brookings, SD Posts: 10,497	Re: 67-72-----4x4 I believe the np205 transfer case was in most 1969's and all 1970-1972's. The transfer case before that was the Rockwell t221. In a lot of people opinions the 205 is the superior transfer case. __________________ Some people are like slinkies, they aren't good for anything, but you can't help but smile when you see one tumble down the stairs.

03-23-2015, 04:41 PM	#3
SS Tim Registered User Join Date: Aug 2010 Location: Edwards, CA Posts: 7,503	Re: 67-72-----4x4 71-72 with the NP205 transfer case and disc brake, open knuckle front axle is probably the best choice. __________________ Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID Blazer SPID Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders Do you have a 1972 Plaid Pickup? Plaid Blazer ** Plaid Suburban

03-23-2015, 05:52 PM	#5
68350 Senior Member Join Date: Jan 2002 Location: Williston, ND Posts: 2,999	Re: 67-72-----4x4 The 205 in my opinion is the best transfer case they have made. Its basically rock solid and indestructible for most applications. __________________ 68 Chevy CST/10, 50th Anniversary, 327/th400, 373 posi, buckets 68 GMC Shortbox Stepside, 402/th400, Tilt, Tach, Bucket Seats, 3.08 Positraction 69 Chevy Camaro SS, 383, 4 speed, positraction 70 Chevy El Camino SS396, Triple Black, 454/th400, Tach 70 Chevy Shortbox Stepside 4x4, 350/th350, Tilt, Tach, Cab Lights, Bumper Guards, Tow Hooks 70 Chevy 3/4 Longbox, 350/auto, 70k, SURVIVOR 71 Chevy Blazer, CST, 350/auto 71 GMC Sierra K2500, 454, 4 speed, 4.10 posi, 37s 71 Custom/30, Open Road, 350/th400, tilt 72 Chevy Shortbox Fleetside, 496 Stroker/th400, Tilt, Tach, Bucket Seats, 3.42 Posi 72 GMC Sierra Grande 2500. 427/th400, tilt, a/c, tool and stowage, buckets/console, 3.54 posi

03-23-2015, 08:00 PM	#7
tjc Senior Member Join Date: Jun 2011 Location: burlington,iowa Posts: 439	Re: 67-72-----4x4 can you put the 205 in a 68

03-23-2015, 08:35 PM	#8
CUSTOM/10 Senior Member Join Date: May 2003 Location: Sandown, NH Posts: 2,851	Re: 67-72-----4x4 Absolutely, but there are different versions. Auto, standard, 1/2 ton, one ton in later model trucks, slip yoke rear in later blazers. You just need to know what you plan on doing and get the correct version for your application ! Also the correct adapter, and 205 crossmember ! Gary __________________ Gary 72 SWB 4x4 My 72 SWB Build http://67-72chevytrucks.com/vboard/s...d.php?t=259859

03-23-2015, 08:46 PM	#9
Vintage Windmills Vintage 4x4s Join Date: Sep 2010 Location: Prior Lake, MN Posts: 4,305	Re: 67-72-----4x4 The all gear rockwell T221 used through 69 is probably just as strong as the np205 but its harder to get parts for. __________________ 67 GMC K1500 Custom- 305V6 SM420, PTO, Ram Assist, yellow (the outcast) (project period correct upgrades) 67 GMC C2500 351V6 TH400, AC, PS, PB (can't decide what to do with. Update, decided to keep and will restore ) 86 CHV K30 502 th400, apple red NEW 71 CHV K20 350 SM465, ochre (saved work truck) 71 CHV K20 292 SM465, white, tach, PTO, (future project) 72 CHV K20 350 350th, medium blue (project stocker) 01 CHV K2500hd crew, indigo blue ^3 dont run and the others don't see winter either '86 K30 Cummins "Fireside" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=649649 '71 K20 "get driveable" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=590642 '72 K20 Build Thread: http://67-72chevytrucks.com/vboard/s...=493477&page=6

03-24-2015, 01:47 PM	#13
tjc Senior Member Join Date: Jun 2011 Location: burlington,iowa Posts: 439	Re: 67-72-----4x4 I found a 72 1/2 ton with auto and cast iron transfer case, would that be original to 72

03-24-2015, 02:40 PM	#14
CUSTOM/10 Senior Member Join Date: May 2003 Location: Sandown, NH Posts: 2,851	Re: 67-72-----4x4 If it's original it would be a TH350 & NP205. If nothing has been changed, and it's a 72 ! Gary __________________ Gary 72 SWB 4x4 My 72 SWB Build http://67-72chevytrucks.com/vboard/s...d.php?t=259859

03-25-2015, 07:34 AM	#16
burnin oil Registered User Join Date: Jan 2013 Location: Eastern TN Posts: 1,921	Re: 67-72-----4x4 The 205 is a beast but it is not the strongest. The bearing supports are aluminum so it will flex under a lot of torque. Sled pullers blow the crap out of them. The newer NP271/273 case is a lot stronger than the 205. The 205 is very adequate for most applications though.

03-25-2015, 11:58 AM	#17
johnw893 Registered User Join Date: Nov 2014 Location: tollhouse, ca Posts: 28	Re: 67-72-----4x4 The rockwell is about the toughest you can get but loud loud (straight cut gears) just don't run them low on oil



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