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Thread: Gear availability question

  1. #1
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    Gear availability question

    ok, the answer is probably obvious, but I am missing that detail ...

    Why on earth can I not find 4.88 thick gears, standard rotation for a Danad 60 ? I can find gears below and above the 4.88 ratio as a "thick gear", standard rotation, but the 4.88 I can't ...

    Is there a reason for this ?
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    No specific reason for that I'm aware of. But if this is for your CJ with 42's, I'd be skipping the 4.88's anyway. 5.13 - 5.38 would be a better choice for sure and you can get thick gears in those ratios.
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    you need to learn the ways of the google !!! i found them in 30sec
    http://www.justdifferentials.com/ind...oducts_id=4000

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    I figured there was no specific reason, and google was not being my friend this time around, as I cant seem to find any justification. On paper it seems 5.13 might be a better choice I know. The CJ see's a lot of road use still, and with a 4 speed, my focus is trying to keep rpm's down, especially since most of the speed limits around town are at 80km/hr. Trying to figure the balance ..tricky

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    I found that too, but I need to call this shop in the morning. The part # they reference, when crossed checked on the mfg's site actually seems to lead to the reverse rotation. I am hoping that it is standard rotation, but I think its a typo and it's really a reverse rotation ... thanks for checking though, I'll call in the morning

    Quote Originally Posted by r.d.a View Post
    you need to learn the ways of the google !!! i found them in 30sec
    http://www.justdifferentials.com/ind...oducts_id=4000

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    4.88's will be marginal at best. 5.38's would be best. Don't get too caught up in ideal cruising rpm with a 401 and 42's in a CJ. You will be splitting hairs and mileage will suck no matter what gear is in it. You might as well enjoy the performance by giving it the gear it deserves. I run up and down those same 80 km roads as you with 44's and 5.86's with a 454 and I don't ever think that I have too much gear. I like it the way it is. It makes for a spirited ride with no compromises.

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    thanks for the insight and advice...more to consider

    Paul

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    One more piece of insight from my tiny little mind: Your build is not conservative. 4.88's are putting that 401 out of the best part of it's power curve with 42's. You should be selecting gears that are on par with the rest of your build. Don't go conservative on gearing - you will only be disappointed. Personally, I'd consider 5.13 - 5.38 a somewhat conservative gear for 42's. Those ratios barely compensate for the tire diameter - never mind the huge amount of spinning weight and rolling resistance that cause a significant parasitic drag increase over tires only a few inches smaller than 42's.

    I assume you have a 400 HP 401 because you want to have a fun ride - not a turd. LOL

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    no turds ! lots of great advice, lots to consider too, thank you for the knowledge/advice

    Paul

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    No turds for sure!

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