Fitting a front propshaft

[Laderhosen]

Need to fit the front prop shaft back on my 88 Blazer. The previous owner removed it because he said it was noisy and needed the bearings doing.

I'm gonna fit it anyway to see for myself what the problem is, is there anything I need to know about fitting a propshaft. Any specific tips, torque settings etc???

Also, I found in my old bills and receipts that the truck had a new back axle fitted, a CUCV one. There's a bill from an Army surplus place. If the front and rear axles have different gearing ratios can that cause problems?

Thanks.

[Irish_Alley]

Yeah it can cause problems if you don’t just drive it in the mud but even then it aint good I would defiantly pop the coves and check the ratio. The prop shaft I know we would just tighten them down and make sure they have lock washers

[fitz]

That CUCV rear axle should have 3.08 gears with a Gov lock in it.

[Laderhosen]

That CUCV rear axle should have 3.08 gears with a Gov lock in it.

That’s what I’m hoping it is, I’m presuming it’s a CUCV axle as it was bought from an Army Surplus dealer. How can I tell if it’s a CUCV axle???

[fitz]

Thats what I'm hoping it is, Im presuming its a CUCV axle as it was bought from an Army Surplus dealer. How can I tell if its a CUCV axle???
[/quote]

  Theres no markings on it or anything but as far as I know all of the Military Blazers (which are referred to as M1009's) came with 3.08 gears and a Gov Lock posi.
  If you don't want to pull the cover I would jack up the rear axle to confirm it's a posi.
  If you have a receipt from the Army store and it's a posi, I would think it's a safe bet to say it's from a CUCV with 3.08's.
   

[Laderhosen]

Thats what I'm hoping it is, Im presuming its a CUCV axle as it was bought from an Army Surplus dealer. How can I tell if its a CUCV axle???

  Theres no markings on it or anything but as far as I know all of the Military Blazers (which are referred to as M1009's) came with 3.08 gears and a Gov Lock posi.
  If you don't want to pull the cover I would jack up the rear axle to confirm it's a posi.
  If you have a receipt from the Army store and it's a posi, I would think it's a safe bet to say it's from a CUCV with 3.08's.
  
[/quote]

When you jack it up and rotate one wheel the other goes the opposite direction, does that mean it’s a posi???

Next weekend I’m gonna pop the covers of both axles and change the fluid anyway, so I can find out the gearing. I’m hoping they are the same gearing.

[fitz]

 
[/quote]
When you jack it up and rotate one wheel the other goes the opposite direction, does that mean it’s a posi???
[/quote]

Negative, if it has a gov lock (as a Military blazer should) both wheels would turn in the same direction. It's time to pull the cover and see what you have.

[Laderhosen]

When you jack it up and rotate one wheel the other goes the opposite direction, does that mean it’s a posi???
[/quote]

Negative, if it has a gov lock (as a Military blazer should) both wheels would turn in the same direction. It's time to pull the cover and see what you have.
[/quote]

Would the diff be locked up if both both wheels were off the ground though? Surely they'd only spin the same way if the diff was locked???

[Laderhosen]

Popped the cover off today, and this is what I found....


I jacked up just one side and tried to rotate just one wheel also, and it wouldn’t rotate, so I’m thinking this is a Gov Lock??

It has 40 teeth on the crown and 13 teeth on the pinion, dividing the two I get 3.0769... presume that means I have 3.08 gears??

[Irish_Alley]

I wana say it open don’t know the name of it but I think gov lock has more parts like springs and floppy thingies

[Captkaos]

What does the other side look like?
A gov-loc will be "open" until load is added to the actuator.

[Laderhosen]

What does the other side look like?
A gov-loc will be "open" until load is added to the actuator.

Didn't rotate the axle I'm afraid. How can I test for this??? One wheel on the ground, truck in neutral, try and rotate the jacked up wheel???

[Captkaos]

you can't "test a gov-loc.  It needs inertia to make it engage.  That is why I was asking what the other side looked like.

It appears what you have is open.

[Laderhosen]

you can't "test a gov-loc.  It needs inertia to make it engage.  That is why I was asking what the other side looked like.

It appears what you have is open.

Ok, maybe I’ll try the method of flooring it on gravel to see if I leave an ’11’....

[Irish_Alley]

You can have posi on the gravel and on pavement only one wheel