Huck's daily - 2005 Z71 crewcab

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TotalyHucked

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Auburn, Georgia
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Zach
Truck Year
1985
Truck Model
Sierra 1500
Engine Size
5.3
Got on the front diff after work today. Unfortunately I forgot to take pictures a lot of the time. I managed to get the cir clip off the pass side axle and get it out of the extension housing so I could replace that axle seal.

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Got the new ring gear transferred onto the original carrier

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Threw the pinion in with the setup bearings (they’re the same as the rear axle). Then pressed on the carrier bearings, put the side adjusters in and carrier races in. Dropped the carrier in.

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Then put the case halves back together so I could get a backlash measurement

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TotalyHucked

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1985
Truck Model
Sierra 1500
Engine Size
5.3
Got creative with the setup for measuring lol

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That’s a HUGE Chrysler battery out of the boss’ 2021 Durango lol

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Had to take it back apart a couple times. It’s such a ratio change, leaving the side adjusters where they were at disassembly wasn’t even close to right. So I ended up just backing the drivers side all the way out to get the ring gear close to the pinion and then sneak back up on it. With the adjuster from the outside.

First measurement got me at .055-.058-ish. This is a very difficult thing to measure/feel so I was working with ranges. Also had to keep in mind I had to divide by 2, so that put me at .0275-.029.

Adjusted the side adjusters some more and got down to .041-.043. Kept sneaking up on it, basically a tooth at a time on the adjusters

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Finally, got it to .017-.019. Spec is .006-.010. So that puts me right in the meat of the range, .0085-.0095. Score!

All the maths again

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TotalyHucked

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1985
Truck Model
Sierra 1500
Engine Size
5.3
So then I threw some paint on and checked the pattern. Unless Spencer or someone sees anything I missed, I’d say that’s good enough for the girls we date. Especially for the front axle that only sees occasional use

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legopnuematic

Licensed Junk Dealer
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Spencer
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1971, 1̶9̶7̶4, 1976, 1979,1̶9̶8̶5, 2002
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Dart Swinger, Sierra 10, C10 Cheyenne, C10 Big Ten, Silverado 10, Ram 2500
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225/6, 350 c.i., 350 c.i., 5.9l Cummins
Looks decent from over here. I don’t envy you having to play with that clamshell differential contraption :D
 

TotalyHucked

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Auburn, Georgia
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Zach
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1985
Truck Model
Sierra 1500
Engine Size
5.3
I was hoping I might be able to completely finish up the front diff and have it ready to go back in the truck last night, but of course that didn't happen. Lost 45min brainstorming with a buddy on the phone about fuel systems for 2 trucks he's building. And I decided to use the heat the bearing/freeze the pinion trick but didn't think about it early enough in the night so I lost about 1.5hrs on that waiting for it to heat up and then cool back down (I ate dinner while I waited) instead of being able to multitask.

But I did make some progress. Got the the case split and pulled the carrier back out, cleaned the marking compound off the gears, replaced the ring gear bolts with the new ones (had a brain fart and had reused the old ones, thankfully I had not locktited them), locktited and torqued them down. Got the inner pinion bearing on (plopped right on, heated to ~250 for 30min with the pinion in the freezer for that 30min), threw the crush sleeve and new outer pinion bearing on. Pinion seal and yoke on and started tightening it down.

I learned that the front diff is a little different than the rear in that you start getting into the crush sleeve before the for and aft movement in the pinion is taken up, like quite a bit before. So that was frustrating. Set the case half on some cardboard on the floor with that big battery on top and my deadblow underneath for stability. Started out with my 1/2" breaker bar, ended up spreading the ears on that once I started to get into the crush sleeve. I grabbed the impact out of frustration and was sitting there thinking about it when I remembered the boss has a 3/4" kit, I grabbed that breaker bar and 32mm socket and a jack handle for a cheater pipe. That worked like a charm, guess I'm picking up a few 3/4" tools now.

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FINALLY! Got to where I need to be. I literally laid on the floor for a few minutes after that, that's a workout lol

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It took nearly 1.5hrs sneaking up on it to finally get the rotational torque spec. I was just turning it 1/4-3/8" each time and then recheck. Landed at 18in/lbs, spec is 14-19. Perfect! Double checked on the table with an extra hammer supporting the other ear.

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This is what I think of doing crush sleeves on an IFS. The rear is much easier

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