203, 205 208 whats the difference - The 1947 - Present Chevrolet & GMC Truck Message Board Network

72dually · 03-01-2005, 09:31 PM

I just got a 68 K10, it has a 4sp I want to change to auto, whats my options??? which is better etc.
any help apreciated
Thanks

**JIMs70GMC** · 03-01-2005, 10:03 PM

203- full time 4wd has a chain and differential inside. Found behind 4spds and TH350s maybe TH400s?
205- part time gear driven, considered one of the best. Found behind all sorts of autos and manuals. Available in 1969?
208- part time chain driven, aluminum case, good but needs a lot of TLC. Has a tailshaft w/ slip joint. Will allow fluid to come out if rear driveshaft removed. Found behind TH700R4s for sure and others. Showed up in the 80s.

1969 GMC · 03-01-2005, 10:25 PM

you basically have 4 options...the TH350, TH400, 700R4(4L60E), and 4L80E. Depends on what you are gonna use it for and if you want OD or not.

The NP208 came behind the first 3. The NP241, which is similar to the NP208, came behind the last 3. The NP203 came behind the first two. The NP205 came behind the first two, and it also came behind the 4L80E in '91 one ton 4x4s. However due to the increase in popularity, adapters can be had to match just about any transfer case up to any transmission, but custom stuff is always expensive. Out of these 4 listed, I am partial to the overall strength of the NP205, but again it depends on what you want from the truck.

Good luck with your choice.

*1FaastC10* · 03-01-2005, 10:44 PM

Quote:

Originally Posted by 1969 GMC

you basically have 4 options...the TH350, TH400, 700R4(4L60E), and 4L80E. Depends on what you are gonna use it for and if you want OD or not.

the 4L60E and the 700R4 are two different transmisions. the 700R4 (later the 4L60) can be run without a controller, the only non-hydraulic function of the trans is the TCC lockup. in late 1992 the 4L60E was nixed in favor of the 4L60E, which uses the same base trans as the 700R4/4L60 but incorporates a new valve body, which is entirely electronically controlled. this trans CANNOT be used without an ECM or a an aftermarket stand alone controller.

1976Scottsdale · 03-01-2005, 11:25 PM

It depends if you have lockouts on the front end or not. If you want to use a 203, you need to be sure it has been converted to use lockouts. I along with the others prefer the 205, but also like the 208's as well. I think they are easier to work with because they are lighter.

72dually · 03-01-2005, 11:45 PM

Thanks guys, I'll look for a 205 and tranny

72 CustomCamper · 03-02-2005, 12:11 AM

The 208 also came behind sm465 4 spd...

*1FaastC10* · 03-02-2005, 01:23 AM

SM465 was available with all transfer cases 203, 205, 208, and 241

1969 GMC · 03-02-2005, 01:25 AM

Quote:

Originally Posted by 72dually

I just got a 68 K10, it has a 4sp I want to change to auto, whats my options??? which is better etc.
any help apreciated
Thanks

..

*1FaastC10* · 03-02-2005, 01:29 AM

just passing along information... god knows you can never have too much of that. i am sorry that i disgraced your forum oh mighty 4x4 god.

03-01-2005, 09:31 PM	#1
72dually Senior Member Join Date: Apr 2004 Location: Northern Arizona Posts: 687	203, 205 208 whats the difference I just got a 68 K10, it has a 4sp I want to change to auto, whats my options??? which is better etc. any help apreciated Thanks

03-01-2005, 10:03 PM	#2
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	203- full time 4wd has a chain and differential inside. Found behind 4spds and TH350s maybe TH400s? 205- part time gear driven, considered one of the best. Found behind all sorts of autos and manuals. Available in 1969? 208- part time chain driven, aluminum case, good but needs a lot of TLC. Has a tailshaft w/ slip joint. Will allow fluid to come out if rear driveshaft removed. Found behind TH700R4s for sure and others. Showed up in the 80s. __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

03-01-2005, 10:25 PM	#3
1969 GMC Registered User Join Date: Feb 2003 Location: The Rubber City Posts: 5,498	you basically have 4 options...the TH350, TH400, 700R4(4L60E), and 4L80E. Depends on what you are gonna use it for and if you want OD or not. The NP208 came behind the first 3. The NP241, which is similar to the NP208, came behind the last 3. The NP203 came behind the first two. The NP205 came behind the first two, and it also came behind the 4L80E in '91 one ton 4x4s. However due to the increase in popularity, adapters can be had to match just about any transfer case up to any transmission, but custom stuff is always expensive. Out of these 4 listed, I am partial to the overall strength of the NP205, but again it depends on what you want from the truck. Good luck with your choice. __________________ 1969 GMC K2500 1996 Honda Accord 2007 Kawasaki KLR 650 Last edited by 1969 GMC; 03-01-2005 at 10:27 PM. Reason: oops

03-01-2005, 11:25 PM	#5
1976Scottsdale Registered User Join Date: Aug 2004 Posts: 76	It depends if you have lockouts on the front end or not. If you want to use a 203, you need to be sure it has been converted to use lockouts. I along with the others prefer the 205, but also like the 208's as well. I think they are easier to work with because they are lighter. __________________ When she starts to knock, bury the pedal and give it a proper death.

03-02-2005, 12:11 AM	#7
72 CustomCamper huh ??? Join Date: Nov 2002 Location: Fredericksburg,Va. Posts: 3,368	The 208 also came behind sm465 4 spd... __________________ 90 Blazer Silverado 350w/ 700R4 and 32" Kelly's "I am a bomb technician. If you see me running try to keep up!"

03-01-2005, 11:45 PM	#6
72dually Senior Member Join Date: Apr 2004 Location: Northern Arizona Posts: 687	Thanks guys, I'll look for a 205 and tranny

03-02-2005, 01:23 AM	#8
1FaastC10 Account Suspended Join Date: Oct 2002 Location: Elkhart, IN Posts: 6,399	SM465 was available with all transfer cases 203, 205, 208, and 241

03-02-2005, 01:29 AM	#10
1FaastC10 Account Suspended Join Date: Oct 2002 Location: Elkhart, IN Posts: 6,399	just passing along information... god knows you can never have too much of that. i am sorry that i disgraced your forum oh mighty 4x4 god.

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