Transfer case swap questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

cooldickwallace · 09-18-2013, 04:33 AM

Im putting a 6.0 and 4l80 out of a 99 2500 into my 68 GMC and Im having trouble finding info on what the best transfer case option is. I have the 261 from the donor truck and was wondering if anyone has used it. Ive also seen the adapter kit from Advanced Adapters to go from a 4l80 to a 205. Wondering what the best option is. Thanks!

**special-K** · 09-18-2013, 06:56 AM

The NP241 came behind 4L80Es in the '91 V series Suburbans and Crewcabs. I was thinking the later NP205 from behind a TH400 should work. Am I wrong?

**special-K** · 09-18-2013, 07:59 PM

Let me suggest you ask this question in the Off Road section,since the set-up isn't specific to 67-72 and over there this is the language they talk

Bigdav160 · 09-18-2013, 09:09 PM

Isn't the drop to the drivers side on all the independent suspension year models?

**special-K** · 09-19-2013, 06:55 AM

To use any '88+ K-model transfer case changing front axle to Ford or Dodge w/passenger side drop is required. The '89-91 V-model 241s are the easiest way to go,with '89-cable driven speedo being the easiest,while keeping front axle stock...or any pre-88 GM. Adapting to an original 205 requires aftermarket adapter. Not real clear on whether some later round pattern t-case set-ups bolt-in. Gotta look at the spline count,length,and factory adapter for compatibility

09-18-2013, 04:33 AM	#1
cooldickwallace Registered User Join Date: Sep 2013 Location: Benton City WA Posts: 1	Transfer case swap questions Im putting a 6.0 and 4l80 out of a 99 2500 into my 68 GMC and Im having trouble finding info on what the best transfer case option is. I have the 261 from the donor truck and was wondering if anyone has used it. Ive also seen the adapter kit from Advanced Adapters to go from a 4l80 to a 205. Wondering what the best option is. Thanks!

09-18-2013, 06:56 AM	#2
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,852	Re: Transfer case swap questions The NP241 came behind 4L80Es in the '91 V series Suburbans and Crewcabs. I was thinking the later NP205 from behind a TH400 should work. Am I wrong? __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

09-18-2013, 07:59 PM	#3
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,852	Re: Transfer case swap questions Let me suggest you ask this question in the Off Road section,since the set-up isn't specific to 67-72 and over there this is the language they talk __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

09-18-2013, 09:09 PM	#4
Bigdav160 Registered User Join Date: Apr 2011 Location: Klein Texas Posts: 3,852	Re: Transfer case swap questions Isn't the drop to the drivers side on all the independent suspension year models? __________________ My Classics: '72 K20 Suburban + '65 Dodge Town Wagon '72 Corvette Roadster +'67 Corvette Roadster '73 Z-28 Camaro '63 Ford SWB Uni Pickup '50 Ford Coupe

09-19-2013, 06:55 AM	#5
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,852	Re: Transfer case swap questions To use any '88+ K-model transfer case changing front axle to Ford or Dodge w/passenger side drop is required. The '89-91 V-model 241s are the easiest way to go,with '89-cable driven speedo being the easiest,while keeping front axle stock...or any pre-88 GM. Adapting to an original 205 requires aftermarket adapter. Not real clear on whether some later round pattern t-case set-ups bolt-in. Gotta look at the spline count,length,and factory adapter for compatibility __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~



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