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Diameter of AMC 20 axle tubes? (Read 1904 times)
SKeown
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Diameter of AMC 20 axle tubes?
03/29/08 at 21:29:13
 

 I need to order some U-bolts for ataching the springs to an AMC 20 rear end, being the car is 70 miles away, I'm hoping someone can tell me the proper size bolts needed.
 
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DragRacinAMC
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Re: Diameter of AMC 20 axle tubes?
Reply #1 - 03/29/08 at 21:36:58
 
2.5"
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Re: Diameter of AMC 20 axle tubes?
Reply #2 - 03/29/08 at 23:44:23
 
I am not sure they are 2.5" I used 2 3/4" Ubolts on mine and they were just right. GL
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Re: Diameter of AMC 20 axle tubes?
Reply #3 - 03/30/08 at 00:18:11
 
I am sure.....I measured them.
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Re: Diameter of AMC 20 axle tubes?
Reply #4 - 03/30/08 at 04:13:42
 
Ok I was using 2 3/4 ubolts for the rear sway bar brackets I made so that may be different than the U bolts for the spring mounts. If you measured then I can't argue with that! GL
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Re: Diameter of AMC 20 axle tubes?
Reply #5 - 03/31/08 at 17:28:42
 

 Calvert Racing says 2 3/4", so I'm still wondering.
 
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Re: Diameter of AMC 20 axle tubes?
Reply #6 - 03/31/08 at 21:09:43
 
Definite 2.5". I double checked yesterday out of curiosity.
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Re: Diameter of AMC 20 axle tubes?
Reply #7 - 03/31/08 at 23:50:46
 
2.5 on the 20 tubes as was said.
the spring/shock plate holes are 3" center to center.
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Re: Diameter of AMC 20 axle tubes?
Reply #8 - 04/03/08 at 14:43:46
 
Mine also measure 2.5
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Re: Diameter of AMC 20 axle tubes?
Reply #9 - 04/04/08 at 03:13:11
 
remember you need a little bigger U bolt to be able to slip over the 2.5" tube Wink I think that is why Calvert says 2 3/4 Course I have only used the 3" tube 9" rear so I really can't be sure. Smiley
 
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Re: Diameter of AMC 20 axle tubes?
Reply #10 - 04/04/08 at 12:22:22
 
Here are the pics of my sway bar brackets with 2 3/4" U bolts. They fit nice.
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Re: Diameter of AMC 20 axle tubes?
Reply #11 - 04/04/08 at 13:11:35
 

 I told Calvert Racing that the OEM shock mounting plates had 3" C to C mounting holes, they said that 2 1/2" U bolts would be needed in that case. I will know in a few days, for sure.
 
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Re: Diameter of AMC 20 axle tubes?
Reply #12 - 04/04/08 at 15:51:17
 
U-bolts are measured from the inside so you order them using your axle diameter.Rock auto has them for about $5-6 each.My local spring shop wanted $11.50 each.Stock u-bolts are 1/2" diam.
Heres my cure for the sway bar mount. Trailer perches that are 1.75" wide.
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Re: Diameter of AMC 20 axle tubes?
Reply #13 - 04/04/08 at 23:47:55
 
The U bolts on my car are not bent square like a u bolt from a hardware store, they may be 2.5 at the loop but flare to around 2.75 at the bottom . maybe a little more.
I had to pinch them together a little to get them in the shock plates.
 
2.5 or 2.75 it is not going to make much difference. I think ether one will work.
But what do I know. undecided
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