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#1 |
Registered User
Join Date: Sep 2019
Location: Scottsdale Arizona
Posts: 114
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Help choosing rear end parts
Good morning everyone. I took apart my rear end conpletely yesterday except for the pinion. I want to go ahead and rebuild the entire thing, but I’ve never done this before and was hoping for a bit of feedback. Here’s what I have
77 K10 12 bolt 30 spline axles 11 pinion teeth, 41 ring gear teeth (3.73 ratio, correct?) It currently has the G80 locker, but I’d like to install an actual locker on it. The ring gear has a few small chips on the ends of of a few teeth, but nothing major. I don’t mind replacing the ring and pinion, but I’m pretty intimidated by that. At the same time, I’d love to be able to say that everything in the rear has been replaced. What does everyone here think about installing a new carrier, but keeping the old ring and pinion? Should I be pretty safe reusing the old axle shafts instead of getting replacements? Also, what kind of locker should I go for? I do a bit of off roading, but never anything hardcore. Most light or medium stuff, and lots of sand. I’d say 75 percent of my driving would be on the road, mostly just picking up the kid from school, or cruising around |
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#2 | |
Registered User
Join Date: Oct 2009
Location: Buhl, Idaho
Posts: 1,438
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Re: Help choosing rear end parts
Quote:
For the kind of driving you do, I would strongly recommend a Eaton TrueTrac limited slip. This is a excellent posi that does not have clutch packs to wear out and you run just regular gear oil with no additives for the clutch packs found in other limited slip units. The TrueTrack uses a helical gear design. The g80 was marginal at best even when new I would ditch it. I have a TrueTrac in the front 10 bolt in my 81 k10 and it has been flawless and I wish I put one in the rear of my truck instead of the Detroit locker. Rebuilding a rear end is not a task for beginners as you do need some specialty tools such as a dial indicator. I would strongly recommend you take the axle or truck to a shop to do the work. It is possible to do yourself but like I said not for a novice mechanic or beginner.
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86 c30 crew cab dually 454/400 4/6 drop SOLD 1-8-11 1981 chevy K10 short Bed Scottsdale SOLD 10-26-2020 67 GMC Stepside Straight six/3 on the tree "The Peach" 2020 Silverado Double Cab LT Z71 5.3 8 speed Daily Driver K10 build http://67-72chevytrucks.com/vboard/s...d.php?t=671934 The Peach build http://67-72chevytrucks.com/vboard/s...d.php?t=733903 ![]() |
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#3 | |
Registered User
Join Date: Sep 2019
Location: Scottsdale Arizona
Posts: 114
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Re: Help choosing rear end parts
Quote:
https://www.summitracing.com/parts/dtl-913a315 Does the above look correct for my application? As far as taking it to a shop, I really want to do this myself. The whole point of buying this truck last year was for the learning experience. I’m fairly mechanically inclined, so I’m confident I can get it done. Although it will probably take me waaaay too long to finish it correctly |
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#4 | |
Registered User
Join Date: Oct 2009
Location: Buhl, Idaho
Posts: 1,438
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Re: Help choosing rear end parts
Quote:
__________________
86 c30 crew cab dually 454/400 4/6 drop SOLD 1-8-11 1981 chevy K10 short Bed Scottsdale SOLD 10-26-2020 67 GMC Stepside Straight six/3 on the tree "The Peach" 2020 Silverado Double Cab LT Z71 5.3 8 speed Daily Driver K10 build http://67-72chevytrucks.com/vboard/s...d.php?t=671934 The Peach build http://67-72chevytrucks.com/vboard/s...d.php?t=733903 ![]() |
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#5 |
Registered User
Join Date: Sep 2019
Location: Scottsdale Arizona
Posts: 114
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Re: Help choosing rear end parts
Here is what I’ve picked out so far. I’m hoping somebody wouldn’t mind going through this list and telling me if I have all the correct parts, or if there’s anything I’m missing
Differential - https://www.summitracing.com/parts/dtl-913a315 Ring and Pinion - https://www.summitracing.com/parts/mgr-gm12-373 Ring and Pinion Install Kit - https://www.summitracing.com/parts/rat-3005k C-Clips - https://www.summitracing.com/parts/yga-33083 Crush Sleeve Eliminator Kit - https://www.summitracing.com/parts/yga-55046 Carrier Bearing Kit - https://www.summitracing.com/parts/yga-57010 |
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#6 |
Registered User
Join Date: Oct 2009
Location: Buhl, Idaho
Posts: 1,438
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Re: Help choosing rear end parts
Looks good. Nice selection of parts.
__________________
86 c30 crew cab dually 454/400 4/6 drop SOLD 1-8-11 1981 chevy K10 short Bed Scottsdale SOLD 10-26-2020 67 GMC Stepside Straight six/3 on the tree "The Peach" 2020 Silverado Double Cab LT Z71 5.3 8 speed Daily Driver K10 build http://67-72chevytrucks.com/vboard/s...d.php?t=671934 The Peach build http://67-72chevytrucks.com/vboard/s...d.php?t=733903 ![]() |
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#7 |
Registered User
Join Date: Jan 2007
Location: vernon b.c.
Posts: 3,022
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Re: Help choosing rear end parts
If you do take it to a shop make sure he specializes in rear ends. I took mine to a shop where I thought he was good ,had a little howl on coast which he said it would break in and the pinion bearing went in a year. Do a lot of asking around and you will find one shop pops up more than others
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#8 |
Registered User
Join Date: Sep 2019
Location: Scottsdale Arizona
Posts: 114
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Re: Help choosing rear end parts
I’m a week or two away from pulling the trigger on ordering these parts, but now I’m having doubts about the 3.73 gears. I’d rather not have to regear the front, but I also want to do the rear correctly the first time
I running a 350, 700r4 and 35” tires. I’ve read that I should be using a higher gear ratio... anybody have any thoughts on what I should do? |
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#9 |
Post Whore
![]() ![]() Join Date: May 2015
Location: Alabama
Posts: 14,630
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Re: Help choosing rear end parts
I def wouldnt go any higher..with 35s and od, 3.73s would be as high as I would go...
With 3.73s, 35s, and a .7 od, your only turning 1629rpm at 65... 4.11s will get you 1795rpm....if I was gonna change that's more what I'd look at.... I went with 4.56s on mine...I wanted around 2000rpm at 65 with my LS/v4500 Heres a rpm calc thatll help you determine things...just fill in blanks at bottom of page... http://www.csgnetwork.com/multirpmcalc.html
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Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver Last edited by mongocanfly; 07-30-2020 at 11:26 PM. |
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#10 |
Registered User
Join Date: Sep 2019
Location: Scottsdale Arizona
Posts: 114
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Re: Help choosing rear end parts
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#11 |
Post Whore
![]() ![]() Join Date: May 2015
Location: Alabama
Posts: 14,630
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Re: Help choosing rear end parts
Gotcha...yeah higher means lower...haha....higher numerical = lower ratio....
Matt's covered it pretty good...building a diff isnt for the faint of heart... can be very frustrating and requires some specialized tools as well You'll need dial indicators, calipers, torque wrenches...both ft/lbs and in/lb... A dial in/lbs torque wrench to check rotational torque.. A good press, bearing separators , setup bearings.. a case spreader is nice to have And a lot of time and patience... I agree with the tru-trac...but I like Yukon gears and kits...
__________________
Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver |
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#12 | |
Registered User
Join Date: Sep 2019
Location: Scottsdale Arizona
Posts: 114
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Re: Help choosing rear end parts
Quote:
Anyway... what’s the deciding factor on if I should go with LOWER gearing in the rear? It drove down the freeway fine before. It didn’t feel like it had much oomph when stomping the gas, but I’m not going to be racing it or anything |
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#13 |
Post Whore
![]() ![]() Join Date: May 2015
Location: Alabama
Posts: 14,630
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Re: Help choosing rear end parts
That no oompfff means you really need a lower gear...
If your riding around at 55 or less in od, your engine is just barely above a idle...like barely 1300rpm.. It all boils down to what you want... thing is, if your going to the trouble and expense to do all the work, then optimizing your setup would be a good thing....my opinion Off roading will be much more enjoyable with lower gears... I've done quite a few riffs, and I still watch the vids ...its one of those things that if you dont do it every day it's easy to forget the little things..
__________________
Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver |
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#14 |
Post Whore
![]() ![]() Join Date: May 2015
Location: Alabama
Posts: 14,630
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Re: Help choosing rear end parts
In your list of parts you have carrier bearings listed seperate...those are included in the kit..
I've not used ratech...I think it uses koyo bearings.. I'd highly recommend the Yukon kit...it comes with timken bearings..and the Yukon gears instead of motive
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Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver Last edited by mongocanfly; 07-31-2020 at 12:01 AM. |
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#15 |
Registered User
Join Date: Sep 2019
Location: Scottsdale Arizona
Posts: 114
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Re: Help choosing rear end parts
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