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05-15-2012, 11:11 PM
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#1 |
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Registered User
Join Date: May 2005
Location: Bowling Green, Mo
Posts: 204
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78 k25
I just acquired a 78 gmc k25. It has the 44front, sf 14 bolt, 400 tranny, and I haven't crawled under it to check if 203, or 205. What's your thoughts on transfer. I plan on lifting and running 33-35 in tires. As far as motor, I am thinking 355 or 383, this depends on what components I can buy off my uncle, he builds dirt track racecars. My question is what is needed to be upgraded in my drivetrain to be able to be used but not break on me?
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1978 GMC K25 2002 Dodge Dakota R/T rc swb In need of some more goodies. |
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05-15-2012, 11:20 PM
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#2 |
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Join Date: Apr 2012
Location: A Sunny Place For Shady People
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Re: 78 k25
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Chris '69 C-20 '04 Jeep TJ |
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05-15-2012, 11:26 PM
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#3 |
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Registered User
Join Date: May 2005
Location: Bowling Green, Mo
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Re: 78 k25
I will stop by my friends tomorrow and get some pics for you guys, in text, its green, rusty, has homemade grilled guard, and headache rack. And the best part, paid for and still didnt empty the wallet. Forgot to add, its ugly.
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1978 GMC K25 2002 Dodge Dakota R/T rc swb In need of some more goodies. |
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05-16-2012, 07:49 PM
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#4 |
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Re: 78 k25
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1978 GMC K25 2002 Dodge Dakota R/T rc swb In need of some more goodies. |
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05-16-2012, 08:39 PM
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#5 |
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Join Date: Apr 2012
Location: A Sunny Place For Shady People
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Re: 78 k25
Awe yea !
Get it running an drive the shatt out of it !
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Chris '69 C-20 '04 Jeep TJ |
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05-16-2012, 09:15 PM
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#6 |
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Location: Bowling Green, Mo
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Re: 78 k25
It runs and drives and is currently licensed, got about $400 in it as it sits.
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1978 GMC K25 2002 Dodge Dakota R/T rc swb In need of some more goodies. |
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05-20-2012, 08:38 PM
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#7 |
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Registered User
 
Join Date: Mar 2007
Location: Camino, CA
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Re: 78 k25
From what I can see from the picture it looks like your truck has no locking hubs on the front, so without seeing the t-case I'd say you have an NP203.
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1978 Chevy C10, 1986 Chevy K20 'Burb, 1970 Chevelle, 1996 K2500 'Burb, 1977 Chevy K10, 1970 Ford F-250, 72 Ford F100 4x4, 1979 Chevy C30, 1982 Chevy C30, 1996 Chevy Dually 4x4 SAS, 1997 Chevy Tahoe, 1991 Ford F-350 cclb dually 4x4 |
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05-23-2012, 08:59 PM
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#8 |
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Join Date: May 2005
Location: Bowling Green, Mo
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Re: 78 k25
It does have the 203, I would like to figure out the gears this weekend. Hoping 3.73.
Posted via Mobile Device
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1978 GMC K25 2002 Dodge Dakota R/T rc swb In need of some more goodies. |
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05-24-2012, 12:34 AM
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Chevys Kick A$$
Join Date: Jan 2005
Location: Zootown, MT
Posts: 12,699
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Re: 78 k25
Get rid of the 203 transfer case first of all. the rest of it don't sound to bad should be able to stand up to some abuse with the lift and tires you want to run. Not to bad a looking truck lift it and go out and beat on it. At least you wont have to worry about messing it up haha
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*HOODS is what I answer too* -'79, '77, '88 Pickup Sold, '85 Camaro, '83 T/A, '81,'83,'90 K5 Blazer All Sold  -'79 3/4 ton "Big Yellow Bananna" Lifted 4spd. 39.5 TSL Swampers, The money Pit   -'86 K5 Blazer Silverado 6.2 4" lift 35"s -'95 Ext. Cab Shorty 4" Tuff Country rolling 35" M/T's -'83 Monte Carlo T-Tops. 126,500 Original Miles -LATER  I would rather push a Chevy then drive a ford!!
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05-24-2012, 11:05 PM
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#10 |
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Location: Bowling Green, Mo
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Re: 78 k25
What's wrong with the 203? I probably won't have over 3-350 HP, and 35 inch tires. I doubt I break it, but i never had a truck with one, but I also never broke the 208's I've had.
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1978 GMC K25 2002 Dodge Dakota R/T rc swb In need of some more goodies. |
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05-27-2012, 10:08 AM
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Canadian Trucker
Join Date: Nov 2010
Location: Sarnia, ont canada
Posts: 648
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Re: 78 k25
The 203 is an awd transfer case, if you can take it out of 4wd, then it's been modified. It's a very weak transfer case, hard on your steering components because it's always engaged and you don't even need 200hp to break it.
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05-27-2012, 11:01 AM
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#12 |
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Re: 78 k25
I always heard the 203 were strong, but needed more care to be reliable. And I can't take it out of 4wd, so it hasn't been modified.
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1978 GMC K25 2002 Dodge Dakota R/T rc swb In need of some more goodies. |
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05-27-2012, 11:25 AM
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#13 |
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Canadian Trucker
Join Date: Nov 2010
Location: Sarnia, ont canada
Posts: 648
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Re: 78 k25
The 208 is a good chain driven transfer case, but the 203, which is also chain driven, is a good boat anchor. I had a 203 behind a 4.3, in an s10 I build, and it didn't last the first time wheeling, the chain snapped. I swapped it for a 208, and never had a problem. My friend owns that truck now and he still wheels it hard 10 years later with no problems.
If you want a good transfer case look at a 208 or even better a 205. If you find a 205 keep the front hi-lo section of the 203 and build a doubler.
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05-27-2012, 12:01 PM
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#14 |
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Location: Bowling Green, Mo
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Re: 78 k25
I'm not gonna swap at this time, to much involved. Might find 205 for a doubler.
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1978 GMC K25 2002 Dodge Dakota R/T rc swb In need of some more goodies. |
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05-27-2012, 12:46 PM
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#15 |
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Re: 78 k25
The ft 4wd part doesn't bother me, but the chain strectch kind of does. Which trucks came with the 205 that will bolt up.
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1978 GMC K25 2002 Dodge Dakota R/T rc swb In need of some more goodies. |
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05-27-2012, 01:08 PM
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#16 | |
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Re: 78 k25
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05-27-2012, 01:49 PM
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#17 |
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Canadian Trucker
Join Date: Nov 2010
Location: Sarnia, ont canada
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Re: 78 k25
My 84 K25 had a 205, many other trucks had them, they were options for a lot of years. You just have to find a truck with part time 4x4 and had a th400. Just look online for a NP205 off of a th400. Which I think is the only trans the 205 came on, I could be wrong. Once you go to the 205 you'll want to put manual hubs on the front axle.
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05-27-2012, 04:57 PM
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#18 | |
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Re: 78 k25
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05-27-2012, 05:19 PM
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Canadian Trucker
Join Date: Nov 2010
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Re: 78 k25
Quote:
Best to find one for a th400.
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05-28-2012, 02:26 AM
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#20 | |
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Location: Lewis County, WA
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Re: 78 k25
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05-28-2012, 08:48 PM
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#21 |
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Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
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Re: 78 k25
Some later SM465 had fine spline for a 205, and in '91 only you could get a 4L80E with a 205 behind it.
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06-09-2012, 05:19 PM
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#22 |
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Join Date: Sep 2009
Location: Phoenix AZ
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Re: 78 k25
Also correct. And when/if switching to 205, it MUST be from a T-400, you cant use a 205 from either T-350 or M465 even with a 400 adapter. Or did someone already say that?
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