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Rear end rebuild
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Topic: Rear end rebuild (Read 5878 times)
ackland3
Newbie
Posts: 68
Shade Tree Certified Mechanic
Rear end rebuild
«
on:
September 07, 2014, 09:37:29 am »
Hi I am rebuilding the rear end in my 1985 k10 4WD with a 3.73 gear ratio. I have discovered the ring and pinion are shot along with the bearings and spider gears. Would the spider gears out of a 12 bolt rear end work in a 10 bolt? Does my gear ratio affect the spider gears at all so say would spider gears out of a different ratio work ? I have a couple of gm rear ends laying about but the ratios are different... also would the axle out of one of those work so long as it was six lug?
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1985 K10
305
bake74
Senior Member
Posts: 5871
Re: Rear end rebuild
«
Reply #1 on:
September 07, 2014, 12:25:33 pm »
All your questions could be answered this way. If the spline counts were the same on any piece you want to swap and the size is the same, then they should work.
I am assuming you don't want to get new parts while you have some laying around. What are you going to do with the bearings and races if the rest is junk, those should be junk also. Sometimes you can get a complete master rebuild kit for those GM axles pretty cheap.
The last time I checked it was like $280.00 plus shipping for a master kit.
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#1: The easiest and most obvious solution to any problem is 99% of the time correct.
#2: There is no such thing as impossible, it just takes longer.
74 k10, 77k10 Tom
DnStClr
Senior Member
Posts: 1806
Re: Rear end rebuild
«
Reply #2 on:
September 07, 2014, 06:26:32 pm »
Not to put words in your mouth, but it sounds like you want to mix and match gear sets. and the answer is-no. You don't want to mix and match gear sets. Gears develop a wear pattern. When you change the set-up of the gear partnership you are very likely to create a new wear pattern that causes lots of clearance issues between driver and pinions. For that reason, you find the dif gears sold as a set.
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Don
87 Chevy Silverado
ackland3
Newbie
Posts: 68
Shade Tree Certified Mechanic
Re: Rear end rebuild
«
Reply #3 on:
September 10, 2014, 12:52:39 am »
I since ordered a rebuild kit with a new ring and pinion along with bearings shims marking compound etc. plus new spider gears. Now my biggest question is what should my backlash be for the axles? I've heard horror stories of them grenading if they are off even a little bit...
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1985 K10
305
bake74
Senior Member
Posts: 5871
Re: Rear end rebuild
«
Reply #4 on:
September 10, 2014, 08:05:13 am »
Check out this article.
http://sethirdgen.org/10bolt2.htm
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#1: The easiest and most obvious solution to any problem is 99% of the time correct.
#2: There is no such thing as impossible, it just takes longer.
74 k10, 77k10 Tom
Jason S
Senior Member
Posts: 1561
Re: Rear end rebuild
«
Reply #5 on:
September 14, 2014, 09:59:28 pm »
Did your ring and pinion come have setup specs supplied?
Do as much research as you can on reassembling a gear set. There are electronic copies of factory service manuals on the forum as well as many websites with lots of information. The early 70's manuals (i.e., 73 and 74) provide a very good fundamental working of the various components, including the axles.
It's been a about a decade since I rebuilt an axle, but the nutshell version is the gear set should be marked as to what is required for proper setup. You would add or subtract shims on the carrier bearings to match the gear set requirements and then 'crush' the crush sleeve to obtain a proper marking on the ring and pinion.
Here is another site with a photographic write-up of a rebuild:
http://www.truckmodcentral.com/forums/f168/gm-10-bolt-rear-gear-install-setup-11732/
«
Last Edit: September 14, 2014, 10:15:58 pm by Jason S
»
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1973 GMC K2500, Super Custom, Camper Special, 350, TH350, NP203, 4.10's
1974 Chevrolet K10, Custom Deluxe, 350, SM465, NP203, 3.73's
"1) Peace through strength; 2) Trust but verify; 3) Beware of evil in the modern world"
ackland3
Newbie
Posts: 68
Shade Tree Certified Mechanic
Re: Rear end rebuild
«
Reply #6 on:
September 14, 2014, 11:23:06 pm »
I am really only having trouble finding out what my backlash should be.... I have heard 6-10 thousandths and i just found out my grandfather (bless his heart but still) set it at around 20 in accordance with an old book he had then drove it around 5 miles and said that it ran "hot" I told him not to drive it or anything until I found out the actual specs......
1985 k10 305 engine 28spline axles 10 bolt rear end 3:73 gear ratio 6 lug wheels
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1985 K10
305
Captkaos
OWNER and Administrator
Administrator
Senior Member
Posts: 18464
Re: Rear end rebuild
«
Reply #7 on:
October 09, 2014, 10:55:18 pm »
Nothing on a 12bolt will work on that 10 bolt.
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Chris Lucas
73-87chevytrucks
captkaoscustoms
squarebody
78BIG-TEN
Frequent Member
Posts: 261
Newbie
Re: Rear end rebuild
«
Reply #8 on:
October 10, 2014, 10:13:26 am »
Ring gear backlash 5 to 8.I like to get close to 8.
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Rear end rebuild