can someone tell me what this hole is & some wires

[blazin_blazer]

Easy. Hole is the breather, it's missing.

Wires on t-case are for 4WD indicator.

Two on trans are for reverse.

from what i can see, there is only 1 wire on the trans & its green.

 

[dieselponyexpress]

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.

So there's no factory 2-piece rear shaft on the 80's cab trucks and all who converted their NP205 to fixed yokes have to use a custom shaft?

Walter

 

[thatK30guy]

So there's no factory 2-piece rear shaft on the 80's cab trucks and all who converted their NP205 to fixed yokes have to use a custom shaft?

Walter

Never seen a 1-piece shaft on any converted-fixed yoke truck from '81 on up.

That doesn't mean you have to get a custom shaft. You could find one from any 70's truck that ran the 1-piece shaft on a 205 truck. Just gotta make sure its got the correct sized u-joints to fit your setup.