NP 205 to 350 THM - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 06-11-2000, 12:24 PM
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NP 205 to 350 THM

Could someone help me with #'s, distinguishing characteristics, etc, that will help me locate a NP205 that will couple to a 4X4 350 THM?

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post #2 of (permalink) Old 06-11-2000, 01:11 PM
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Re: NP 205 to 350 THM

I have a '72 K5 blazer that came stock with a NP205 and TH350 (69-72 4x4 used the NP205). there seem to be many of these trucks around, you could probably find one at a junk yard. also the later '70s model 1-ton trucks used the 205 (the '70s 1/2 ton trucks used the NP 203 and NP 208)

post #3 of (permalink) Old 06-11-2000, 01:21 PM
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Re: NP 205 to 350 THM

1980 year will have a 205 with turbo 350 too.

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post #4 of (permalink) Old 06-11-2000, 02:32 PM
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Re: NP 205 to 350 THM

I just converted my 1979 Jimmy from 203 to 205. I wanted to and needed to because the front drive shaft didn't clear the crossmember with a 8" lift and the 203. I found a 1980 with a 350 at a junkyard. It is easiest if you can find a complete vehicle or tranny and transfer case combo to make sure it will fit. The other way is to count the splines on the input shaft. The 350 uses a 27 spline output shaft and the 400 uses a 32 spline shaft. The manual 205's used a 10 spline shaft. You also need to get the adapter and coupling sleeve with the trasnsfer case. The driveshafts will also have to be modified since the 205 is shorter than the 203. The shifter will fit in the same place and the indicator lights for 4WD from the 203 can be used on the 205. The mounting pattern for the adapter and transfer case changed in the 80's from a figure 8 to a circle so make sure tou get the right adapter. The manual 10 spline 205 can be adapted to fit the 350 but the kit is about $400. The 205 from a 400 has the same problems plus it needs to be machined for a larger input bearing. If you find a 205 and 400 together forget the 350 and use them.

post #5 of (permalink) Old 06-12-2000, 09:46 PM
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Re: NP 205 to 350 THM

Hey, I just happen to have a NP205 lieing around with the correct TH350 adapter plate and all. I will let it go for $2800 and I will even throw in a 1976 Chevy short bed along with it!

Seriously though, I went home to Colorado and bought the 1976 truck to pirate the SM465 for my 1978 K10 and swapped in the TH350/NP205 combo from my 1978 K10. The truck is a stock solid Colorado truck and has never seen salt! I am located in the southeast Michigan area.

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