Transfer Case Question...? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**67 cst swb** · 01-27-2006, 04:45 PM

What transfer case do I need? I have a 68 3/4 ton 4x4. It has the 4 speed trans with granny 1st gear. I guess it currently has a Rockwell transfer case in it(???) I am thinking of converting to a Auto Trans (TH350/TH400). I'm supposing I need the NP205C transfer case. Do I need the 27 spline input or 10? fixed or slip rear yoke? I see they used the NP205C from 69-86 what years are all the same as I need?
Also, What is the Rockwell issue? Are there no adapters to use my current transfer case behind a TH350/TH400? Or is it not worth using?
Please enlighten me on some 4X4 info...

P.S. oh, it's the truck in my avatar...

john@thepier · 01-27-2006, 08:44 PM

Have you gone to Advanced Adapters site to see what they may offer. JOHN

CG · 01-27-2006, 09:20 PM

have you asked this question in the 4x4 area? those guys really know their stuff.

Rod · 01-28-2006, 12:14 AM

Your probably better off finding a complete 205 transfer case and trans combo. ..original late 69 to 72 units used the NP205 with 27 spline adapter to the turbo 350 and had fixed yoke.
If you want the 400 trans you need a NP205 with a 32 spline female adapter ..but as mentioned above..advance adapters has modification unit pieces to convert different combinations to work.

01-27-2006, 04:45 PM	#1
67 cst swb Senior Member Join Date: Nov 2001 Location: Rapid City, SD Posts: 2,281	Transfer Case Question...? What transfer case do I need? I have a 68 3/4 ton 4x4. It has the 4 speed trans with granny 1st gear. I guess it currently has a Rockwell transfer case in it(???) I am thinking of converting to a Auto Trans (TH350/TH400). I'm supposing I need the NP205C transfer case. Do I need the 27 spline input or 10? fixed or slip rear yoke? I see they used the NP205C from 69-86 what years are all the same as I need? Also, What is the Rockwell issue? Are there no adapters to use my current transfer case behind a TH350/TH400? Or is it not worth using? Please enlighten me on some 4X4 info... P.S. oh, it's the truck in my avatar... __________________ My Trucks: 1967 Chevrolet Short Wide Box 327 TH350 9" w/3.90 gears paint will be White - Current Project 1967 Chevrolet Custom LWB 283 TH400 3.73 Posi, no-AC, no-PS, no-PB, bench-seat, small-window - mostly orig driver 1967 Chevrolet CST LWB originally a 327 TH400 3.73 Posi AC PS PB, had Buddy Buckets, Small Window - parts truck 1967 Chevrolet CST LWB, 283 MT 3.73 had Buddy Buckets, Panoramic Window - parts truck 2001 Chevrolet 3500 2WD Crew Cab Dually 8.1L Allison White 2002 Chevrolet 1500HD 4x4 Crew Cab 6.0L 4L80E Red

01-27-2006, 08:44 PM	#2
john@thepier Senior Member Join Date: Aug 2004 Location: Lake Geneva, WI 53147 Posts: 970	Re: Transfer Case Question...? Have you gone to Advanced Adapters site to see what they may offer. JOHN

01-27-2006, 09:20 PM	#3
CG BlahBlahBlah Join Date: Feb 2002 Location: Wa. Posts: 19,816	Re: Transfer Case Question...? have you asked this question in the 4x4 area? those guys really know their stuff.

01-28-2006, 12:14 AM	#4
Rod Join Date: Dec 1999 Location: Eastern - Manitoba Canada, Winnipeg Posts: 4,369	Re: Transfer Case Question...? Your probably better off finding a complete 205 transfer case and trans combo. ..original late 69 to 72 units used the NP205 with 27 spline adapter to the turbo 350 and had fixed yoke. If you want the 400 trans you need a NP205 with a 32 spline female adapter ..but as mentioned above..advance adapters has modification unit pieces to convert different combinations to work. __________________ Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife.



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