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Unread 11-15-2011, 03:43 PM   #1
broach70
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40s on AMC20 and D30???

Ok I have seen, and heard of it. Not sure if its far fetched or real. Is there any way to run a 38" to 40" tire with those axles. I am a very experienced welder and now where I can get both those axles already lincoln locked with one pieces in the 20. The rig they go under will be making lots of hp. What could I do to run these on a true rock rig?? If it TOTALLY cant be done give me reasons why??

Thanks!!!

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Unread 11-15-2011, 03:44 PM   #2
ytowntj
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I hope youre kidding. People routinely brake those axles on 33s and tired 258s putting less than 120 hp to the ground.

For 40's and high horsepower I would say a minimum of 35 spline shafts in the rear, preferably in the front too.
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Unread 11-15-2011, 03:49 PM   #3
FLynes
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My Dana 30 R&P broke on 33's, and I just found that my AMC 20 has one-piece axle shafts, so I ASSume that the PO broke the two-piece too.
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Unread 11-15-2011, 04:22 PM   #4
AFRd_CJ5
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I don't know how much HP you're talking, but my 20 held up to quite a bit in the sand. We've ran stock 30's in the sand with a lot of HP as well. But, this is in the sand. Probably nowhere near the abuse rocks will put them through.
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Unread 11-15-2011, 04:34 PM   #5
foggybottombob
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The answer is no.
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Unread 11-15-2011, 04:35 PM   #6
lucdog
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I you saw the size of a ring and pinion in a Dana 30, you could answer your own question. A 4.56 pinion head is smaller than a orange. More like a plumb.

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Unread 11-15-2011, 06:39 PM   #7
John N
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You could do it, probably for a few seconds, but you could do it.... Understand that it would be a waste of time, effort and parts.
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Unread 11-15-2011, 06:54 PM   #8
skizriz
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Especially locked up. Open diffs are one thing, putting 100% of the torque to a single axle is another.
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Unread 11-15-2011, 07:27 PM   #9
Dmonkey
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rock rigs on 40s break D60s. Not even close to a good idea.
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Unread 11-15-2011, 07:50 PM   #10
Area.3.Fiftyone
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Ummmm, yeah no..........
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Unread 11-15-2011, 07:54 PM   #11
BriansCJ
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No effin way man.

Im swapping/building axles for 35s on a mid HP CJ5.

To run 40s with big power you are gonna need a HP60 w/ RCVs IMO, if you dont want to experience breakage.
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Unread 11-15-2011, 08:05 PM   #12
ButcherJones
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You can totally do it, and it would look sweet!
I sure as hell woudnt try to actually drive it though, just sitting in your front yard it would look great.
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Unread 11-15-2011, 08:57 PM   #13
broach70
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A guy had 360 punched out to 434ci launching it at 4500rpm and running nitrous to a AMC 20 rear for mud and sand drags (my guess was paddle tires) so no im not kidding that was my reason for asking.
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Unread 11-15-2011, 09:01 PM   #14
broach70
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Quote:
Originally Posted by ytowntj View Post
I hope youre kidding. People routinely brake those axles on 33s and tired 258s putting less than 120 hp to the ground.

For 40's and high horsepower I would say a minimum of 35 spline shafts in the rear, preferably in the front too.
Wheel that same setup right now on my 85, never had any trouble and go places that locked TJs with 35s go
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Unread 11-15-2011, 09:02 PM   #15
mopar346
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I think Jeephammer lauches and totes on a 20 so I would like to here his thoughts, I believe the ring gear is like 9.75. The axles, case and tubes I hear are the weak links in a 20. The 30 however is like a GM 10 bolt used in the S-10s.
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