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can someone tell me what this hole is & some wires

blazin_blazer

blazin_blazer

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well poo, it came out of an 84 k30, iirc...i was hoping it was a 32spline output w/the t-case input being a 32 spline female t-case input...i thought all the 1 tons had the 32 spline shafts...so the 32 spline front & rear output shafts i've bought are just shifting my weak spot to the t-case input shaft?

1st what is this hole?...is it a vent hole and just missing the little plastic 1-way vent valve?here is the pic again, i used paint to point out the hole i'm talking about.

DSC00702a-1.jpg


and these wires, they are 1 white & 1 black:

DSC00709a.jpg


and this green wire:

DSC00711a.jpg


and heres an overall pic showing their exact position:


DSC00710a-1.jpg

thanks ahead of time.
 
Easy. Hole is the breather, it's missing.

Wires on t-case are for 4WD indicator.

Two on trans are for reverse.
 
dyeager535 said:
Easy. Hole is the breather, it's missing.

Wires on t-case are for 4WD indicator.

Two on trans are for reverse.
Click to expand...

He is correct. That is a 10 spline output SM465 with a female coupler in the adapter housing. Pretty common. The one tons didn't get the 32 spline output until around 1985. With the slip yoke rear output, I'd guess that is out of a 1980 something.

Martin
 
82355 said:
He is correct. That is a 10 spline output SM465 with a female coupler in the adapter housing. Pretty common. The one tons didn't get the 32 spline output until around 1985. With the slip yoke rear output, I'd guess that is out of a 1980 something.

Martin
Click to expand...

Well, this combo does have a slip yoke on the 205 but it is a 10 spline input.

Dorian is correct about everything.
 
4X4HIGH said:
Well, this combo does have a slip yoke on the 205 but it is a 10 spline input.

Dorian is correct about everything.
Click to expand...

That is what I said. Maybe I should of worded it differently. I meant that the guy who answered him in the second post was right about the hole for the breather and the purpose of the two wires.

The rest of what I wrote was in response to this:

blazin_blazer said:
well poo, it came out of an 84 k30, iirc...i was hoping it was a 32spline output w/the t-case input being a 32 spline female t-case input...i thought all the 1 tons had the 32 spline shafts...so the 32 spline front & rear output shafts i've bought are just shifting my weak spot to the t-case input shaft?
Click to expand...

Not all K30's got 32 spline output SM465's. K30's came out in 1977, and 32 spline output SM465's came out in K30's in 1985 I believe.

The 10 spline input shaft on the NP205 won't be the weak point, the female coupler between the SM465 and the NP205 will be.

This is the ten spline output shaft of the SM465.
sm465D.jpg


Here is the 10 spline input of the NP205.
np205d.jpg


Here is the adapter.
sm465l.jpg


Here is the weak point of that combo. The female splined coupler in the adapter.
np205a.jpg


sm465F.jpg


SM465G.jpg


SM465H.jpg


sm465i.jpg


Then I noticed that he had a slip yoke rear output shaft. He thought he got the tranny from a 1984 K30.

All 1980 Chevrolet 4x4's had the NP205 transfer case. Most of them were slip yoke rear output's though. So I would assume that that SM465/NP205 combo came out of a 1980, whether it was a K5, K10, or K20. I could be wrong, but I think all K30's used a fixed yoke rear out put. At least my 1980 K30, and my 1982 K30 both did.

Martin
 
Fixed vs. slip was based on something different. Not really sure what, but slip was used in '85-88 on the one tons, while the fixed was as well.

Someone may have answered this in previous posts, I just can't remember what the determining factor was.
 
I seem to remember all crew cabs and and maybe duallies? I'm not for sure on that one.
 
I got a D60 and TH400 version 205 with the adapter from an early 80s 1 ton, has the slip yoke. Also got an 86 that was a 4-speed, that has the bolt on yoke. Looking at an 84 crew, IIRC that has a bolt on yoke also.
 
BadBob said:
I seem to remember all crew cabs and and maybe duallies? I'm not for sure on that one.
Click to expand...
All regular cab trucks got the slip yokes beginning in '80.

All the crew cabs and cab-and-chassis's got the fixed yoke.

I've torn down and worked on quite a few along with inspecting hundreds of others rigs and figured all that out.
 
thatK30guy said:
All regular cab trucks got the slip yokes beginning in '80.

All the crew cabs and cab-and-chassis's got the fixed yoke.
Click to expand...

Would that be due to the longer wheelbase with the 2 piece shaft, or were there some C&C's that had a 1 piece shaft?
 
USSkoval said:
Would that be due to the longer wheelbase with the 2 piece shaft, or were there some C&C's that had a 1 piece shaft?
Click to expand...
Yep, 2-piece.

A cab-and-chassis is only 4" longer than a standard LWB truck and it still utilized the 2-piece.
 
thatK30guy said:
All regular cab trucks got the slip yokes beginning in '80.

All the crew cabs and cab-and-chassis's got the fixed yoke.
Click to expand...

That is a handy bit of information. It makes sense, because both of my K30's have been 3+3's. I just assumed all K30's would have been built with a fixed yoke. I was wrong on that part, but I stand by the rest of my post.

Martin
 
To make it even easier, crews and cab-chassis trucks were the ONLY rigs to get the fixed yokes from '80 on up.

ALL the other rigs got slip yokes. Blazers, Subs, reg. cab trucks of both LWB and SWB.

'79 and older trucks are a crapshoot. Those had fixed yokes mainly with some very few late, late 70's rigs running slip yokes.
I've seen slip yokes on 203 t-cases before, too!

Even reg. cab LWB trucks in the 70's used 2-piece rear shafts also.

GM engineers at their finest. They should have just made ALL trucks a fixed yoke and be done with it.
 
Have you ever seen an SM465/NP205 combo with a slip joint, prior to 1980 though?

Martin
 
Trying to remember but most of me wants to say "no".

Its not the slip yokes on 205's that concern me. Its how many have you seen on a 203?
 
I don't care for NP203's but I do have a couple back home. I am trying to remember if they were slip yokes or fixed. One is out of a '76 K10 400/TH350/NP203 and one is out of a '75 K20 350/TH350/NP203. As for SM465/NP205's, I have never seen a 1973-'79 with a slip yoke.

Martin
 
I didn't mean for some '73 - '79 trucks to have slip yokes but rather the 2nd design series trucks which is '77 on up.

2nd design is when GM made a few changes in drivetrain related stuff. Such is the 10 bolt front axle.

I know there was never any slip yoke of any kind on the 1st design stuff.
 
none of the 203 stuff Ive dealt with has had the slip yoke, I guess short of using the rangebox for a doubler, thats the only good thing about the 203 is you are pretty sure to have a fixed yoke.
 
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