GEARS GEARS GEARS, Please read before posting gear questions - Page 2 - Ford Bronco Forum
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post #21 of 330 (permalink) Old 12-22-2004, 08:19 PM
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I like Randy's calculators cause you can input your gearing if you don't have one of the tranny's listed in the above link.
http://randysringandpinion.com/conte...lators/RPM.asp
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post #22 of 330 (permalink) Old 12-22-2004, 08:56 PM
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Originally Posted by 79F150
Here is a gear calculator for you Tomb971 http://www.grimmjeeper.com/gears.html try this old to see what you want to run. Stock gears and 33 are not bad try 38's.






I use this one.

Last edited by 79F150; 09-24-2011 at 10:23 PM.
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post #23 of 330 (permalink) Old 02-17-2005, 02:16 PM
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You could also add VIN codes for axles to this as well. eg. under "axle" on your door's VIN sticker "H9" is 3.55's with a limited slip, "C5" would be 4.10 with a limited slip. This could help when searching the local wreckers.
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post #24 of 330 (permalink) Old 02-26-2005, 02:37 PM
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Quote:
Originally Posted by Beerman
Also this write is assuming you have an E4OD, or similar auto tranni.
So how off would this figures be for those running a ZF 5 speed?

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post #25 of 330 (permalink) Old 02-27-2005, 02:43 PM
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I use this one.
This one is great... except they don't list my T-case...

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post #26 of 330 (permalink) Old 02-27-2005, 04:35 PM Thread Starter
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Sorry, for a zf 5 speed you will hve to figure out what your rpm band range is now, then do the math listed for each gear. once you have that then you will know your overall rpm range for 5th gear

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post #27 of 330 (permalink) Old 08-12-2005, 09:57 PM
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My inside door sticker says the stock tire size is 265/75R15. Roughly 30.6 inches tall. So 4.10s with 35s will be about spot on.


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post #28 of 330 (permalink) Old 08-16-2005, 12:21 PM
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Quote:
Originally Posted by Beerman
.....
Circumference of tire divided by the gear ratio you want.
....
33" tire, 3.55 gears = 103.7" circ, forward 29.2", about 15% more than stock
Now my 8th grade math class taught me that circumference was 2*pi*r. So...

EDIT: Removed my strange math.

EDIT: Ha ha. Except that tires sizes are diameters and I was forgettig the 1/2 first that made it SEEM like the 2 was missing from the equation.

Size does matter. That is why they make 40oz.

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post #29 of 330 (permalink) Old 10-06-2005, 07:25 PM
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but, once you get larger tires moving does it require any more power to keep them moving than small tires? or is it just about the same difference?
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post #30 of 330 (permalink) Old 10-06-2005, 09:01 PM
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A smidge. Bigger tires have a little more rolling resistance. It's small enough that you can pretty much neglect it, though.
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post #31 of 330 (permalink) Old 10-06-2005, 09:52 PM Thread Starter
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Re-gearing makes it easier to turn the big meats, however stopping the big meats is another issue

"For me, it is far better to grasp the Universe as it really is than to persist in delusion, however satisfying and reassuring."
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post #32 of 330 (permalink) Old 10-10-2005, 09:30 PM
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hmmm, I've found that stock brakes work pretty decently with 33's. I don't ever really put myself in situations that require really quick stopping though.
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post #33 of 330 (permalink) Old 10-13-2005, 10:36 AM
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Hi all

I am Lifting my 1991 FSB and and installing 35 inch tires.
Not using it for off road; the only time I will engage the front is in stuck situations.
So for those of you who have successfuly done this the gear setup
what is the ideal gear ratios for the front axle and rear axle.

Currently the front is 3.54 and don't know what the rear is

thanks
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post #34 of 330 (permalink) Old 10-13-2005, 05:46 PM
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Stock, the front will be the same as the rear. For a daily driver, I'd recommend 4.10s, because its darn near the same overall as 31" tires and 3.55s, which is what mine came with. 4.10s and 35s can get me 16mpg highway if I keep it at 65 on a good day.


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post #35 of 330 (permalink) Old 10-13-2005, 05:47 PM
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Quote:
Originally Posted by Late Model Man
Stock, the front will be the same as the rear. For a daily driver, I'd recommend 4.10s, because its darn near the same overall as 31" tires and 3.55s, which is what mine came with. 4.10s and 35s can get me 16mpg highway if I keep it at 65 on a good day.
4.10's / 4.11's should be perfect for you.



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post #36 of 330 (permalink) Old 10-13-2005, 09:21 PM
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HI

jeff's Bronco Graveyard has 4.09 front and 4.11 rear
ring and pinnion will that do

do you need a bigger housing or just change the ring and pinnion

lou
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post #37 of 330 (permalink) Old 10-14-2005, 11:12 AM
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You are gonna have to get a new carrier for the front. (not a housing) About $50 for open, more for a ltd slip/ locker. The rear is fine, just put the gears in.


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post #38 of 330 (permalink) Old 10-16-2005, 07:14 PM
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thanks

I will need to do this job

there is great write up for the rear 8.8
any one know for the front if there is a rebuild write up

I searched but could not lacate any

thanks

Lou
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post #39 of 330 (permalink) Old 12-28-2005, 05:13 PM
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My stock FSB 351w is 31" with 3.08

I want to go 35" with 3.54

They are the same ratio but is it enough for the 35" or is it better going to 3.73??


Why in USA a lot of people go 4.11 / 4.56 ??
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post #40 of 330 (permalink) Old 12-28-2005, 05:23 PM
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Stock gears are 3.55's...the gear of choice for 35's is 4.45 and for 33's is 4.11...me, I got 25's and stock gears...

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