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    U Joints for Rear Half shaft Axles
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    Senior Member turbomike9's Avatar
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    Just bought a buggy that has u joints with sliding square shaft for plunge.

    The U joints are all torn up, must not be able to handle the power.

    What size/series u joints are people using? Buggy has a 100hp snowmobile engine with the snowmobile CVT. I'm assuming the ones on there currently are "US Series 6" Weasler parts, I will measure to confirm. I would also assume a splined sliding shaft would be better than a square one.

    Ya, CVs are better, but just looking to upgrade what's there on a budget for now as I bought it broke and want to get it driving and see how I like it before investing a lot into it.
    Last edited by turbomike9; 07-02-2019 at 03:40 PM.
    Edge Piranha with Sled Engine, 2 Margay sprint race karts, and a couple of fun Karts
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    Re: U Joints for Rear Half shaft Axles
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    Senior Member turbomike9's Avatar
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    Edge Piranha with Sled Engine, 2 Margay sprint race karts, and a couple of fun Karts
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    Re: U Joints for Rear Half shaft Axles
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    I'm also curious about this myself. I'm not sure on your axle size, however this was a setup I may use. There isn't a power limit on these that are listed, but it cannot be that bad. https://www.dennysdriveshaft.com/p20....250_key_.html
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    Re: U Joints for Rear Half shaft Axles
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    Senior Member turbomike9's Avatar
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    At $10 a piece they certainly won’t last on my buggy.
    Edge Piranha with Sled Engine, 2 Margay sprint race karts, and a couple of fun Karts
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    Re: U Joints for Rear Half shaft Axles
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    Here's a few other's. Honestly surprised no one else has chimed in. https://www.pegasusautoracing.com/ke...dStart=U+joint
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    Re: U Joints for Rear Half shaft Axles
    #6
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    Quote Originally Posted by turbomike9 View Post
    At $10 a piece they certainly won’t last on my buggy.

    No but you're looking at budget repairs to see if you really want to invest the effort and money into the machine. At $10 a piece you can have a few spares on hand and that kind of thing is field repairable. And it's not your 100hp motor that the links aren't holding up to...the live axle is putting more strain on them than the motor is.

    I would say that the real long term solution is plunging CV's but I would probably just keep extra u-joints on hand myself and not worry about it.
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    Re: U Joints for Rear Half shaft Axles
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    Millenium Member plkracer's Avatar
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    Those 1 inch bore yokes are only good for the industrial (5-16 hp) motors, been there a long time ago.

    You would need 1300 series joints as a minimum, in my opinion. The shock loading offroad plays havoc on the joints. Being made of cast material doesn't help either.
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    Re: U Joints for Rear Half shaft Axles
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    Senior Member turbomike9's Avatar
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    What "series" are these Toyota u joints comparable too?

    https://www.driveshaftparts.com/inde...roduct_id=3726
    Edge Piranha with Sled Engine, 2 Margay sprint race karts, and a couple of fun Karts
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    Re: U Joints for Rear Half shaft Axles
    #9
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    I couldn't find an exact. But something on this list maybe of use. Are you getting custom yokes made? https://www.dennysdriveshaft.com/c97...s_by_size.html
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    Re: U Joints for Rear Half shaft Axles
    #10
    Millenium Member plkracer's Avatar
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    Sorry, been away for a while, missed your response.

    Not sure what those toyota joints are from? I would assume a Tundra would use something close enough to a 1310 or 1350, which is what most half ton trucks use. These series of sizes are Spicer/Dana standards.

    3/4 ton trucks used to be 1410, now they all run 1480 (or equivalent) I believe. There were a few people running 1480s with big motorcycle engines for a while. They seemed to hold up OK. The bigger cars ran the 1550 sizes (many moons ago, someone sold them on high angle, huge plunge driveshafts) but everyone seemed to dump them for 934 CV joints.
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