differences between t-cases - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Kybol · 08-05-2003, 12:04 AM

What are the differences between the 203 205 and 208 cases? which ones are better then others, when were they used, I am asking about the 73-87 trucks. Thanks for the help.

1969 GMC · 08-05-2003, 01:26 AM

the 205 is considered the "king" of t cases, it is strong all gear drive, but its low range isnt as good as some others. the 203 is full time, weighs like 75 pounds more than the 205, and is chain drive, but pretty beefy. i am not familiar with the 208.

**JIMs70GMC** · 08-05-2003, 05:33 AM

The 208 has a chain also, but is not full time. It has an aluminum case some what considered inferior but has a 2.61 low range while the 205 is 1.96 and the 203 is 2.0. The 208 also has a slip joint output for the rear driveshaft also considered a problem since the TC fluid will leak out if you remove the driveshaft and try to drive w/ the front axle only. All three were found behind autos and manual trannies. While lower gears are not available for the 205 the thing to do is to take the gear unit from a 203 and mate it inbetween a SM465/205 combo with an adapter from ORD and have some seriously low gears.

08-05-2003, 12:04 AM	#1
Kybol Registered User Join Date: Mar 2003 Location: Alberta, Canada Posts: 205	differences between t-cases What are the differences between the 203 205 and 208 cases? which ones are better then others, when were they used, I am asking about the 73-87 trucks. Thanks for the help. __________________ -90 454ss http://www.imagestation.com/album/?id=4289115843 -04 TRX450R -77 c-10 http://www.imagestation.com/album/?id=4290506213 SOLD -82 c-10 SOLD -02 CRF450 SOLD

08-05-2003, 01:26 AM	#2
1969 GMC Registered User Join Date: Feb 2003 Location: The Rubber City Posts: 5,498	the 205 is considered the "king" of t cases, it is strong all gear drive, but its low range isnt as good as some others. the 203 is full time, weighs like 75 pounds more than the 205, and is chain drive, but pretty beefy. i am not familiar with the 208. __________________ 1969 GMC K2500 1996 Honda Accord 2007 Kawasaki KLR 650

08-05-2003, 05:33 AM	#3
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	The 208 has a chain also, but is not full time. It has an aluminum case some what considered inferior but has a 2.61 low range while the 205 is 1.96 and the 203 is 2.0. The 208 also has a slip joint output for the rear driveshaft also considered a problem since the TC fluid will leak out if you remove the driveshaft and try to drive w/ the front axle only. All three were found behind autos and manual trannies. While lower gears are not available for the 205 the thing to do is to take the gear unit from a 203 and mate it inbetween a SM465/205 combo with an adapter from ORD and have some seriously low gears. __________________ 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



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