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Full Spool 12-27-2012 06:21 PM

Got my Jeep back today
Spent most of the summer with the trans on the ground. Went out a couple times with you guys. After each outing my diff gears lost their backlash clearance. Finally they feel good, and I hope they last.

Last Friday my check engine light came on on the VW Taureg, $1,300 in parts to replace all the components on the front of the engine. This weekend, my Great Dane went lethargic, and took 5 days and wouldn't die, so I had to take matters into my own hands on Christmas Day. Today I lost my only set of keys to the Ford Taurus.

So..... who put the mojo on me? :surrender:

Oldguy 12-27-2012 08:05 PM

Not me man, but shit that's a tough run of luck. Haven't lost a dog in a while but it kills a part of me every time.

Just out of curiosity, how are you setting preload on the pinon gear?

Full Spool 12-27-2012 08:43 PM

Them guys at Predator did it. I had them build the axles.. lockers, gears, axles.
The first set of gears were U.S. Alloy, they shredded themselves in 500 miles. They were shipped back to see if the hardening process was messed. The second set was Yukon, they felt good until I got back from Eagle Rock. It felt like the spider gear pins broke. but the backlash was only out at .012 in the rear.
.004 doesn't seem like a lot but it felt like both axles wanted to jump off the jeep.

They replaced the bearings on the rear pinion, as well they should. Told them they are at least responsible for a few thousand miles.

But to answer your question... I don't know how they get 150 -175 ft lbs on that nut with nothing holding the carrier. Maybe they shoved a rag in there. :doh:

The reason I won't work on gears is I don't know how they get the coast side right. That's just too much in and out for me.

If I don't get it right in 3 attempts, I give up.

Oldguy 12-27-2012 09:23 PM

Setting up gears is the most frustrating and time consuming thing I have ever done.

Pinon preload is set with the carrier out, torquing the whole pinon assembly to spec and measuring the torque to turn the pinon gear in inch pounds. If the pinon bearings aren't seated correctly, if the preload isn't correct, under heavy load the pinon gear is driven to the inside of the ring gear where it tears the living shit out of everything. Setting it up correctly is time consuming, time is money, so guess what happens?

And you're doing this while trying to get the correct load on the ring gear and if you have to change shims on the carrier bearings to get the load center deeper into the ring gear you start the pinon preload process all over again. Someone who is really, really good at it might get it in five or six tries. For an amateur it's more like fifteen or twenty and you've blown a couple days tearing it apart and putting it back together again over and over. Problem is you end up very tempted to say "screw it, it's close enough" when it's not.

If you keep having problems I'll point you to a guy up here who will do it right, he's just not real easy to get along with.

Full Spool 12-27-2012 10:11 PM


Originally Posted by Oldguy (Post 3150384)
If you keep having problems I'll point you to a guy up here who will do it right, he's just not real easy to get along with.

His name isn't Leonard Vahsholtz .... is it? lol

It wouldn't be so bad, but those ARB lockers are two piece, and pretty much require a case spreader to set the preload.
I figured they(Predator) was paid to do a job, and should keep at it until they got it right. In a year, they will probably tell me I'm on my own, unless I bring my wallet.

On a side note, My next task is to do this truss. Gotta find someone that is good at welding on cast.

Oldguy 12-27-2012 10:16 PM

Actually, it isn't, I don't know who does his axles ;)

Are the punkins cast iron, or nodular? I've been wondering about that myself?

Full Spool 12-27-2012 10:29 PM


Originally Posted by Oldguy (Post 3150570)
Actually, it isn't, I don't know who does his axles ;)

Are the punkins cast iron, or nodular? I've been wondering about that myself?

Here's the write up on that particular truss, Been a while since I read it, but I think they are using stainless rod. I'll have to re-read it.

D-30 Axle Truss

They are cast steel, not cast iron.

wanderlust 12-28-2012 07:04 AM

if your welder has enough power it is very easy to weld. just have to let the heat build on the cast part first. In regards to your gear issues, on dana axles alot of the carrier preload comes from stretching the case with a special tool. I believe (dont quote me) you stretch the case by .020inches, set the shims for backlash and tooth pattern then when the case is relaxed again the preload is from that. some axles have several turning torque specs. typically one for just the pinion and then one for the pinion and carrier. I would have to dig to find my dana manufacturing axle books to get exact numbers. Axles are not rocket science but they do require you to follow procedure and get it right.

BV Jeep 12-30-2012 10:43 AM

20 Attachment(s)
I know it will be hard to believe but my buddy and I did a F60 front axle last night. We went by the prvious set up for shims. We set it in, painted it and spent the next hour foguring if the perfect paint markings were right. We are still thinking about it too.

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