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Ring gear bolts. |
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pit crew
Supporter of TheAMCForum Joined: Jul/08/2007 Location: delete Status: Offline Points: 5341 |
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Posted: Dec/12/2017 at 7:35am |
The AMC 20, over the years, used two different bolt sizes for the ring gear depending on year of the axle. The 7/16-20 bolts are very easy to find. The 7/16-24 bolts must be made of un-obtainium. Does anyone have a source for NEW 7/16-24 grade 8 bolts? I have Googled until my fingers hurt and so far no luck so I am going to try here on the forum. The forum members have been very good in the past at finding "rare" items.
Thanks, Ken |
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73 Hornet - 401EFI - THM400 - Twin Grip 20 |
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amc67rogue
AMC Addicted Joined: Nov/05/2008 Location: Phx. AZ. Status: Offline Points: 1578 |
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7/16-24 ?? Do you mean 3/8-24. 67 and earlier used 3/8-24.
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Keith Coggins 67Rogue X code
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Lyle
AMC Addicted Joined: Jul/17/2014 Location: None Status: Offline Points: 772 |
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Fastenal has pretty well any size/grade/finish you may need.
You may need a business number so be prepared to ask your local garage to order them and you pick them up.
I would definitely pay the extra for their "certified" fasteners and the others are may be made in China and you get what you pay for. |
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pit crew
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73 Hornet - 401EFI - THM400 - Twin Grip 20 |
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pit crew
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73 Hornet - 401EFI - THM400 - Twin Grip 20 |
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Lyle
AMC Addicted Joined: Jul/17/2014 Location: None Status: Offline Points: 772 |
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How about these:
http://www.ronsmachiningservice.net/ring-gear-bolts/dana/amc-model-20-ring-gear-bolts/ They may be able to help but 7/16 course is 14 TPI, NF is 20 and ENF is 28. 24TPI is very odd number.
Edited by Lyle - Dec/12/2017 at 9:33am |
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pit crew
Supporter of TheAMCForum Joined: Jul/08/2007 Location: delete Status: Offline Points: 5341 |
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73 Hornet - 401EFI - THM400 - Twin Grip 20 |
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401MATCOUPE
AMC Addicted Joined: May/20/2010 Location: Salisbury, MD Status: Offline Points: 5370 |
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Ken is absolutely correct in the diameter and thread pitch. 7/16-24, the actual combination is called UNS (Unified Standard). AMC included a new set of bolts in each Ring and Pinion Gear Set you bought from them. Another part to grab from old AMC 20 rears, they are unique Grade 8 with oversize hex heads, but low profile.
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Ross K. Peterson
68X,GoPac,343,AT,52A(1stCar) 68X,GoPac,390,4sp,52A 69X,GoPac,390,4sp,64A 70X,GoPac,390,4sp,87A,8 70X,GoPac,390,4sp,BBO,8 70 Jav SST,390,AT,BSO 74MatX,401,AT,Prototype 74MatX,401,AT |
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Rebel Machine
AMC Addicted Joined: Jul/03/2007 Location: Western Il Status: Offline Points: 5118 |
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Here's a photo of two AMC 20 ring gear bolts. The bolt on the left is aftermarket that fits the Yukon ring gear I have. The bolt on the right is original AMC. I think I've got two sets of these.
-Steve- |
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Lyle
AMC Addicted Joined: Jul/17/2014 Location: None Status: Offline Points: 772 |
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Not much of a fan of chasing a bolt thread same size and different pitch as you will be weaken the clamping force significantly. Looking, ARP sells M12-1.50 bolts in a variety of lengths.
This is 0.040" larger then your current bolt but in the end you get a new bolt, fresh threaded hole and a lot more strength then original. This would likely fit better and easier to do then going up to 1/2-20. I have looked for a M11-1.0 (7/16-25) that is so close to the 7/16-24 that I would do that but can only find taps and dies, no bolts???
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