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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: Mike Phillips on January 28, 2008, 11:17:06 am

Title: Will a 350 from a 203 transfer case bolt up to a NP205 Transfercase
Post by: Mike Phillips on January 28, 2008, 11:17:06 am

Will a 350 from a 203 transfer case bolt up to a NP205 Transfercase

Title: Re: Will a 350 from a 203 transfer case bolt up to a NP205 Transfercase
Post by: Captkaos on January 28, 2008, 11:46:51 am

Are you talking about a TH350?  Was the NP205 behind a TH350?  If so it will work.  If it was behind a TH400 or manual, the spline count is different.

Title: Re: Will a 350 from a 203 transfer case bolt up to a NP205 Transfercase
Post by: Mike Phillips on January 28, 2008, 12:39:41 pm

Yes.

I gentleman in my home town has a TH350 Automatic Transmission out of a 4 wheel Drive Blazer that was connected to a 203 Transfercase.

He has the transmission and the adapter component that attached the transmission to the transfercase but he no longer has the transfercase.

I picked up my 1975 Blazer yesterday and a friend drove it home for me.  It runs and drives great but I can't drive a manual shifting transmission, so until I replace the 4-speed with an automatic transmission I can't drive it.

So I'm hoping this transmission and adapter plate will bolt up to my NP205 transmission.

So yes, this is a TH350 Automatic Transmission, will it, with the adapter component/plate bolt up to my NP205 transfercase?

Thank you for your help, I'm dying to drive this truck!

Title: Re: Will a 350 from a 203 transfer case bolt up to a NP205 Transfercase
Post by: Mike Phillips on January 28, 2008, 12:47:17 pm

Just out of curiosity, what is the NP203 transfercase?

I know the NP205 is a gear driven transfercase, is there a thread on this forum that outlines the available transfercases and their differences?

Title: Re: Will a 350 from a 203 transfer case bolt up to a NP205 Transfercase
Post by: Captkaos on January 28, 2008, 01:12:13 pm

If your current Transfercase is behind a manual, then the t-case won't bolt up.  Manuals had 10 spline inputs, TH350 has 27 spline and TH400 had 32 spline..
NP203's are fulltime cases.  As in they are always in 4x4...

Title: Re: Will a 350 from a 203 transfer case bolt up to a NP205 Transfercase
Post by: Blazin on January 28, 2008, 01:17:24 pm

Just my 2 cents, but wouldn't it be easier to learn to drive a stick than go to all the work of swapping it out for an automatic?

Title: Re: Will a 350 from a 203 transfer case bolt up to a NP205 Transfercase
Post by: Mike Phillips on January 28, 2008, 01:24:41 pm

Quote from: Blazin on January 28, 2008, 01:17:24 pm

Just my 2 cents, but wouldn't it be easier to learn to drive a stick than go to all the work of swapping it out for an automatic?

I lost my right leg just above the knee in a Drag Boat accident and now have an artificial leg, besides that I prefer an automatic because it makes it easier to let others drive when pulling a boat or Quad trailer.

Title: Re: Will a 350 from a 203 transfer case bolt up to a NP205 Transfercase
Post by: Mike Phillips on January 28, 2008, 01:26:05 pm

Quote from: Captkaos on January 28, 2008, 01:12:13 pm

If your current Transfercase is behind a manual, then the t-case won't bolt up. 

Rats...

Thanks...

Title: Re: Will a 350 from a 203 transfer case bolt up to a NP205 Transfercase
Post by: Mike Phillips on January 28, 2008, 02:27:56 pm

Quote from: Captkaos on January 28, 2008, 01:12:13 pm

If your current Transfercase is behind a manual, then the t-case won't bolt up.  Manuals had 10 spline inputs, TH350 has 27 spline

Can a tranny shop install the correct spline?

Title: Re: Will a 350 from a 203 transfer case bolt up to a NP205 Transfercase
Post by: Blazin on January 28, 2008, 02:56:22 pm

Nothing like sticking your foot in your mouth, all the way up to the knee. Sorry about that!

Title: Re: Will a 350 from a 203 transfer case bolt up to a NP205 Transfercase
Post by: Captkaos on January 28, 2008, 03:07:59 pm

Yes, you can get the stuff from here:
https://eshop.advanceadapters.com/commerce/ccc1222-np205-10-spline-input-281971-8529.htm
Call these guys they can tell you what you need for sure.

Title: Re: Will a 350 from a 203 transfer case bolt up to a NP205 Transfercase
Post by: locdogg on January 28, 2008, 08:41:13 pm

Quote from: Blazin on January 28, 2008, 02:56:22 pm

Nothing like sticking your foot in your mouth, all the way up to the knee. Sorry about that!

LOL, that gave me a good chuckle