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- Dave
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- 1984
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- Scottsdale
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It's Steve. I'm not calling my truck Steve.
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Huck's daily - 2005 Z71 crewcab
- Thread starter TotalyHucked
- Start date
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TotalyHucked
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- Joined
- Feb 24, 2020
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- 4,057
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- 13,294
- Location
- Auburn, Georgia
- First Name
- Zach
- Truck Year
- 1985
- Truck Model
- Sierra 1500
- Engine Size
- 5.3
Back on this today. Decided to do some learnin' since I've already been down this long, what's another day or so for educational purposeseses?
When we left off, I had .026 worth of shim on the pinion and .2535 RH and .2225 LH carrier shims. I decided to start the day with taking the .0105 shim off the pinon and just run .016. The OE was .036. I figured this would throw things pretty far off...the pattern improved
Ok, so we'll stick with that. But backlash opened up to .013-.014. So I figured I'd move the carrier toward the pinion .005. Couldn't make that happen with the shim choices I have, but I did have a .0075 shim in this stack I could move. So I used that, moved the carrier over .0075. Started with checking backlash before painting/running a pattern.
Most spots where .006-.007. But I did have a section that was .008-.0095 and another that was .004-.005.
Here's the tight section. It's weird cuz it's only 3 teeth, it's .006 on one end and .008 on the other but .004-.005 in between. Thankfully, this is 180* from the .008-.0095 section, so I'm gonna spin the ring gear 180* on the carrier and see where I land. I'm eating lunch now, I'll update later
When we left off, I had .026 worth of shim on the pinion and .2535 RH and .2225 LH carrier shims. I decided to start the day with taking the .0105 shim off the pinon and just run .016. The OE was .036. I figured this would throw things pretty far off...the pattern improved
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Ok, so we'll stick with that. But backlash opened up to .013-.014. So I figured I'd move the carrier toward the pinion .005. Couldn't make that happen with the shim choices I have, but I did have a .0075 shim in this stack I could move. So I used that, moved the carrier over .0075. Started with checking backlash before painting/running a pattern.
Most spots where .006-.007. But I did have a section that was .008-.0095 and another that was .004-.005.
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Here's the tight section. It's weird cuz it's only 3 teeth, it's .006 on one end and .008 on the other but .004-.005 in between. Thankfully, this is 180* from the .008-.0095 section, so I'm gonna spin the ring gear 180* on the carrier and see where I land. I'm eating lunch now, I'll update later
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TotalyHucked
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- Feb 24, 2020
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- Auburn, Georgia
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- Zach
- Truck Year
- 1985
- Truck Model
- Sierra 1500
- Engine Size
- 5.3
Lost 1.5hrs shooting the **** when a buddy came by, fiddled with some shims to see if I could cheat rather than flipping the gear. Could not, so lost another hour going into town to Home Depot for a map gas torch and dinner. Got the ring gear off and flipped, waiting for it to cool now
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TotalyHucked
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- Zach
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- 1985
- Truck Model
- Sierra 1500
- Engine Size
- 5.3
Well, got it back together again. The ring gear is still 100*+ so I’m taking all of this with a grain of salt and not making any more changes until tomorrow.
The backlash has a smaller range now, .005-.007 but I still have a tight section and a loose section. The good news is, I think (if the BL doesn’t open up once everything is the same temp again), I can just make a ~.003 change to the carrier shims and be pretty good. I sure do hope so anyway. I’m ready to drive this thing again.
The backlash has a smaller range now, .005-.007 but I still have a tight section and a loose section. The good news is, I think (if the BL doesn’t open up once everything is the same temp again), I can just make a ~.003 change to the carrier shims and be pretty good. I sure do hope so anyway. I’m ready to drive this thing again.
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TotalyHucked
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- Auburn, Georgia
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- Zach
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- 1985
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- Sierra 1500
- Engine Size
- 5.3
Hokay. So.
Went to the shop again today to play with this some more. Took some backlash measurements before anything else. Backlash was still too tight, .0055 in a couple spots and .006-.007 everywhere else. I’d rather it be a touch loose than a touch tight and risk burning it up.
So I started checking my shim packs and doing some maths. I had moved the carrier toward the pass side .0075 yesterday. I wanted to go back the other way about .003 but no combo of shims would get me there.
So I decided to swap the .0145 pinion shim for a .012. That seems like such a crazy change from the .036 OE shim but it is a drastic gear change after all
It liked that change. Got backlash to .007-.009, checked all around. Decided to paint and see what happens
I’ve been fighting a defined hard line at the bottom/root of the gear. According to that book I bought, that means the pinion is too close. Finally, I have a football shaped pattern. Consulted a few people, unless someone comes up with a compelling reason to make another change, I think I’m calling this done.
Went to the shop again today to play with this some more. Took some backlash measurements before anything else. Backlash was still too tight, .0055 in a couple spots and .006-.007 everywhere else. I’d rather it be a touch loose than a touch tight and risk burning it up.
So I started checking my shim packs and doing some maths. I had moved the carrier toward the pass side .0075 yesterday. I wanted to go back the other way about .003 but no combo of shims would get me there.
So I decided to swap the .0145 pinion shim for a .012. That seems like such a crazy change from the .036 OE shim but it is a drastic gear change after all
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It liked that change. Got backlash to .007-.009, checked all around. Decided to paint and see what happens
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I’ve been fighting a defined hard line at the bottom/root of the gear. According to that book I bought, that means the pinion is too close. Finally, I have a football shaped pattern. Consulted a few people, unless someone comes up with a compelling reason to make another change, I think I’m calling this done.
TotalyHucked
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- Zach
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- 1985
- Truck Model
- Sierra 1500
- Engine Size
- 5.3
So I decided to hold where I was before making any more changes and get some opinions/insight from Spencer and some others that are more experienced than me.
So I moved on to the front end, converting it to 2wd so I can hopefully start breaking the rear in while waiting on tools to redo the front diff. Put the steering back in, pulled the front driveshaft out and pulled the CV axles apart to use the outer stub shaft to hold the front hubs together. Just cut the cage up till it all fell apart
So I moved on to the front end, converting it to 2wd so I can hopefully start breaking the rear in while waiting on tools to redo the front diff. Put the steering back in, pulled the front driveshaft out and pulled the CV axles apart to use the outer stub shaft to hold the front hubs together. Just cut the cage up till it all fell apart
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