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rear axle

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iwantmyx View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote iwantmyx Quote  Post ReplyReply Direct Link To This Post Topic: rear axle
    Posted: Jun/20/2018 at 6:43pm
I just bought a 74 javelin. It used to have a 6 cyl in it but now has a 78 jeep 360 in it. They upgraded the trans to a 727 but the rear end has 9 inch drums and i am guessing 305 gears. It is not a p track. Must be an amc 15 rear end. Does it really need to be switched to an amc 20 or will it hold up and can i make it a p track with lower gears. Thanks in advance
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WesternRed View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote WesternRed Quote  Post ReplyReply Direct Link To This Post Posted: Jun/20/2018 at 7:32pm
I wouldn't put any money into the AMC15, drive it until it fails if necessary and then upgrade to something stronger.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote LakesideRamblin Quote  Post ReplyReply Direct Link To This Post Posted: Jun/20/2018 at 7:51pm
Yep, try it out. It may work. But if you are mashing on a built 360 the 15 will eventually implode. As an alternative, you can always get a Ford 8.8 or 9 for a reasonable price and gear it accordingly. They are plentiful. It will all come down to how you handle your right foot.

Edited by LakesideRamblin - Jun/20/2018 at 7:56pm
LakesideRamblin
69 Rambler 360
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"If you could kick the person in the pants responsible for most of your trouble, you wouldn't sit for a month." T. Roosevelt
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mixed up View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mixed up Quote  Post ReplyReply Direct Link To This Post Posted: Jun/20/2018 at 10:39pm
I agree with both drive it like a saint and it will hold up till you can get something stronger 8.8 ford are plentiful look at explorers rangers mustang 9 inch are a little hard get these days but possible   
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FSJunkie View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote FSJunkie Quote  Post ReplyReply Direct Link To This Post Posted: Jun/21/2018 at 1:44am
Being a standard open differential helps because in most situations it will just spin one tire before you can apply enough torque to the axle for it to go kaboom. The tire acts as a safety valve. However, that only applies during smooth applications of power such as flooring the throttle to pass somebody. You could floor that 360 around all day long and not blow the axle. You could probably floor it from a dead stop and it will be fine. Burnouts would probably be fine. It'll just spin tires and that will save the axle from going kaboom. 

But that doesn't apply for shock loads. You could still shock load the axle and break it. This could happen if you are spinning a tire and it suddenly grabs something grippy, like spinning the tire on a patch of ice then it grabs dry pavement. Kaboom. A rough shift or neutral drop could do it too. Burnouts on water then grabbing dry pavement, etc. 

Skinny tires and not much weight on them will help you too. 

So really it depends on lot of things. 




Edited by FSJunkie - Jun/21/2018 at 1:49am
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