727 229 reverse bang

[xGROMx]

Ok, I've searched and searched with out finding the information I am looking for. The results I have found is symptoms of the 400-QT setup.

85 Wagon with a 727 and 229, when putting it in reverse it bangs bad, and seems to be getting worse. I crawled under it the other day with the rear off the ground, while twisting the drive shaft you can head a bang (metal to metal) or clank and it seems to be coming from the front of the 229 right at the connection to the tail shaft. Now I see that the coupler on the 400 and QT is a common thing to wear and go. What about the 727 and 229? Coupler? Something inside of the 229?

Drove it 15 miles on the beach today with no problems other than the reverse bang. Does not do it from reverse to drive, only when going into reverse from any gear.

I want to fix it, but don't know where to start. I have never dropped a trans or xfer.

[BillyWagoneer]

mine does the same thing, chain slack probably. drive it till it breaks!

[xGROMx]

Chain slack, am I thinking diffrently on how the transfer case works or doesn't the chain turn the front drive shaft, I have the problem in 2 wheel and 4.

[aktrapper]

U-joints

Mine was doing the same thing and it turned out to be the axle u-joints. Check and replace and see what happens...

[BillyWagoneer]

IM no deliberating expert but IM pretty sure your chain is always going and there is another part that disengages the front end

[Dumpy]

Mine was doing the same thing and it turned out to be the axle u-joints. Check and replace and see what happens...

This

[Billygoat]

Mine 727/229 bangs when you put it in reverse in 2wd, but not when in 4wd
so pretty sure it is not the axle U joints - and my rear shaft joints are good too.

The chain is the front drive, the rear is thru splines

http://oljeep.com/edge_229_exploded.html

However the coupler that allows full time drive is in the thru section of the case (basically a limited slip differential) so I suspect there are issues with it that is creating the bang???

I am in the run it until it breaks camp.

[BillyWagoneer]

If you read the original post, he jacked up the rear and turned the shaft. If you had a u joint on it's way out I think he would have noticed that.

[Miraphone186]

I've been having the same problem, it's weird...

[xGROMx]

If you read the original post, he jacked up the rear and turned the shaft. If you had a u joint on it's way out I think he would have noticed that.

Thanks Billy, and yes its not u joints like ever other person posts on ths question and its not the rear end. As I say it seems to be coming from the front of the 229. Befor. Took it down I was hoping somen one else that had already would chime in. Im nt that fami lar with the 229 and 727 connection but it seems to sound just like the 400 and QT issue.

I hope not, that would m an. Would have to replace both. As for the chain, unless tye chain is driving the rear axl its not the problem.

[The Colonel]

In 2WD mode the NP229 chain isn't under any load. I'd look more at u-joints or diff backlash.

[xGROMx]

In 2WD mode the NP229 chain isn't under any load. I'd look more at u-joints or diff backlash.

Again already ruled out u joints a diff.

[BillyWagoneer]

[addicted]

Take the drive shaft off and eliminate it and the rear diff from the equation. Sounds transfer and you'd be surprised when a diff has issues and it transfers through the hollow drive shaft.

[Carnuck]

^What he said^ It's either Ujoint (likely front) or the tcase yoke is cracked (I've killed 4)
I think (someone else can confirm) the front yoke is the same as rear so you could drop the front shaft out and "borrow" that yoke if the rear is cracked until you get another for the front (put the old rear yoke on the front to keep the oil in but leave the front driveshaft out till you get it)
Another possibility is the output bearing of the tcase is going bad.