OP
zmotorsports
ALLIANCE MEMBER
You have no idea how timely this post is. I’m in the process of freshening up the dynatrac axles in the JK and I wanted to have the rotors turned as part of the process. Resetting the spindle nuts has always been that one thing I’ve never been comfortable doing. On the net I’ve only been able to find the “50 ft/lbs, back it off no more than 1/4 turn” advice for the Dana 60 front which actually did exist in the original service manuals. When I look, the most common post saying so is the one in the Dana 60 bible on pirate. That said, the advise as I understand it applies to brand new packed bearings with the intent if setting initial preload and not for follow-on reassembly. Friends I knew at the dealership (back in my 20’s) said the toque recommendation was too tight and you “just had to have a feel for it”. Knew that was ********. They’d more or less back it off until the bearings felt tight but the resistance/drag was only a little. As you can imagine, I’ve always hated doing it because it’s subjective guessing so I tend to put the step off (drag my feet)...
With a dial indicator, this now becomes a very, very, very easy task. .001 - .004 is a mile so the task becomes a breeze. Huge thanks Mike. Seriously, HUGE.
Matt
Glad to help Matt.
I can honestly say that a front axle, or axle adjustment, was the turning point for me in high school and why I went down the path of becoming a mechanic.
My first vehicle was a 1979 GMC Jimmy (same as Blazer) that I purchased wrecked with the help of my dad. I was to work on it after school weekends in addition to working on the farm so when I turned 16 it would be ready to drive. Well I put a lot more time in that he expected and it was ready long before I had my driver's license.
In addition to some body panels and other damage we discovered a bent front axle housing during the rebuild. My brother who was a heavy truck mechanic at the time told me if I found a straight housing he would swap all of the components over for me.
Upon assembling the used housing he was setting up the front bearings and while he was tightening them down I asked him about the torque spec. He said you have to go by feel.
Now I get that experience comes into play many times but this didn't "feel" right to me. But hey, I was just a dumb kid, what did I know??
Several months later when I finally got my driver's license our FFA (Future Farmers of America) chapter was headed down to Orem for a two-day training seminar and I drove my truck down. I was about 80 miles from home when the front wheel locked up and pulled me off the freeway into the median. It scared the **** out of me.....
Once I gathered my wits about me, I limped my way into town driving slowly along the emergency lane with the front end making all kinds of noise. I pulled into the first service station I came across. It was a small 3-bay garage and as I pulled in a kind looking older gentleman walked out to greet me. He said "that doesn't sound good". I think he could tell that this young punk kid was shaken up and clueless as to what to do. My first thought of calling my dad was quickly dismissed as he would be upset to have to drop what he was doing on the farm to spend several hours to drive south to get me and then figure out how to get my truck home. I didn't want him to worry nor have the expense as time and money was tight for us on the farm.
I talked with the shop owner and inquired about roughly how much it would cost and he said "let's throw it on the lift and see what we're looking at shall we." I remember as the truck was raising the tire cambered severely and once it was at height he reached over to spin the tire and it turned roughly a couple of revolutions and then came off the spindle. I also remember the heat waves coming off the front spindle.
The inner bearings had actually welded themselves onto the spindle and most everything inside of the hub was toast. The gentleman made a couple of phone calls then came back out and told me that he had located the parts in Salt Lake City (about 25-miles back to the north of where we were at). He pointed to his very nice and sweet 1972 Chevy truck and said "if you want to take my truck and go pick up the parts we can get right to work on it when you get back with them while this thing cools off".
I remember being blown away that this guy would give his trust to a teenage kid that he didn't know then go about his work. I was scared to death and didn't know what to do. Did I bite the bullet and call my dad? Did I go get the needed parts? Did I just arrange for a tow truck, have it towed home and deal with it later? I had no idea what to do but I was scared to call my dad, plus I already had a motel room for the night with my classmates so I went and picked up the parts.
Upon returning with the parts the shop owner worked with me to finish disassembling and putting everything back together. I remember when he was setting the preload on the front bearings I asked him about it and he said "well these need to be tight enough to keep them retained but not so tight that they get hot". When I explained how my brother had assembled them he suggested we take a look at the other side while it was on the lift.
As we took the driver's side apart it was also too tight and had signs of being overheated. After everything was assembled and my truck was done I was afraid to ask how much the repair bill would be but faced the fact that no matter what it was the situation could have been much worse.
The guy charged me parts plus $60 labor if I would help him out for a few hours. I remember thinking there is no way this can be happening. I had a few hundred dollars in the bank and asked where the nearest branch was and I would go and grab the money. It nearly wiped out my bank account but I was thankful I had been saving up for a while, even though I didn't know what I was saving for.
I returned, paid the gentleman and then proceeded to work for a couple of hours before I had to leave for my seminar and dinner with my classmates. The next morning as my fellow classmates were heading home I returned to the shop to ask if I could help out as I still felt guilty about what the guy charged me. I worked in his shop for another several hours before saying goodbye, thanking him profusely and heading home to face my dad and explain what had happened.
There were SO many lessons learned from that one situation but it had such a HUGE impact on me and the direction I chose in life. And it all started with an improperly setup front wheel bearing.....


























