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post #1 of (permalink) Old 06-05-2001, 02:57 PM
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Formulas say different?!

O.K. I was messing around with the formula calculators and the formulas say I should use 4.56(I would use 4.62's) for 33's. Keep in mind I am a mud man (dont have many rocks in jax.,florida)and my rig will be a concrete runner as well. The thing that worries me is the fact I will be running a bone stock engine! so should I use the 4.62's??!!!!!

" Go Cheap n' Smooth or Forget about it!"

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Studly
92 Zuki/235's/header/cherry bomb exhaust/Still Building
72 fj40/crate 350/33's/discs
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post #2 of (permalink) Old 06-05-2001, 05:27 PM
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Re: Formulas say different?!

go with the 5.12's for sure, i ran them with 33" muds and i wouldn't want anything higher then that

post #3 of (permalink) Old 06-05-2001, 05:55 PM
 
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Re: Formulas say different?!

4.56/4.62 when used with a 4.16 T-case will correct you gearing for 33s.


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post #4 of (permalink) Old 06-05-2001, 06:08 PM
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Re: Formulas say different?!

What you have to remember is that formula only acounts for the change in tire diameter. There are other hidden factors that you have to figure for too. The first one is tire weight. Those 33" tires probably weigh around 75 pounds each easily. It takes more power to turn those heavier meats. The second is that some people say a larger tire creates more drag. If so, that too would have to be factored in. Now you see why the 4.62 look good on paper, but once you add the other two factors in you will need a slightly lower gear. Go with the 5.12's. They have been proven in the past to be the right combo.

Tim Martin
87' Samurai/1.6L/dual 40mm Mikunis/header/2" exhaust/MSD 6AL/5.5" SPOA/1" shackle lift/CJ-5/Sami springs/31" High-Tecs/roll cage, bumpers & pumpkin caps in progress...
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post #5 of (permalink) Old 06-05-2001, 06:29 PM
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Re: Formulas say different?!

O.K. that is all I will have to say about gears I am just worried about pulling the 33's with a bone stock engine! How will it work locally, Because I will have to drive it to school and around town when I want everyday!!!

" Go Cheap n' Smooth or Forget about it!"

Thanx
Studly
92 Zuki/235's/header/cherry bomb exhaust/Still Building
72 fj40/crate 350/33's/discs
post #6 of (permalink) Old 06-05-2001, 06:39 PM
mike shannon
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Re: Formulas say different?!

put in the 5.12s it will pull the 33s just fine. i run a 4.16 t case and a set of 5.12s and it revs alittle more on the highway but i like it better. and i am running a pretty wore out motor with 120k on it and it pulls them fine. later mike

88.5ht,two87s,88.5 spoa,33X12.50,5.12 f&r,rock cage,4.16 T case
post #7 of (permalink) Old 06-05-2001, 06:42 PM
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Re: Formulas say different?!

Thanx mike/everybody I have had like 50???? posts on R&P's cause I am so anxious to not screw this up! I probably wont run a 4.16 t/case unless I ever upgrade to a 34-35" tyre, but thanx a lot!

" Go Cheap n' Smooth or Forget about it!"

Thanx
Studly
92 Zuki/235's/header/cherry bomb exhaust/Still Building
72 fj40/crate 350/33's/discs
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