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12/14/04, 03:01 PM
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#1
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Full Member
Chico
Joined: May 04
Posts: 325
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Best gear ratio for 37 inch tires?
What gear ratio do you guys think works best for 37 inch tires?
I'd ideally like to be able to Hwy. drive my bronco to the trails, and still be able to wheel.
What do you think?
If it makes any difference, I'll have a Det. locker on the back also.
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1969, 351-w,33's, np-435,
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12/14/04, 03:11 PM
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#2
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Jr. Member
Southaven, Ms
Joined: Mar 04
Posts: 80
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I have a 2001 SUPERDUTY with 37x12.50 17" with 4.11 gears. The 4.11 gears brought it back to a little better than stock.The bronco iI have has 38.5x14.50 15" with 4.11 I haven't drove but a few miles ,but it drove fine in that short distance.I plan on going lower with either 4.56 or 4.88.
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12/14/04, 03:12 PM
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#3
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Contributor
Bronco Guru
...was born with nothing and still have most of it left...
Salisbury, NC
Joined: Oct 03
Posts: 1,605
My Gallery
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I run 4.56 with my 36's. Turn around 2,400 at 55mph on the road. And still has good ratio for offroad with the NP435.
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12/14/04, 03:30 PM
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#4
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Full Member
Chico
Joined: May 04
Posts: 325
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Kind of seems like it comes down to 4:56 or 4:88
I have a NP435 so I'm less worried about my crawliblity. Not really sure I really want my bronco going 70 MPH but would be nice to cruise the HWy with out winding up the motor.
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1969, 351-w,33's, np-435,
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12/14/04, 03:32 PM
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#5
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Contributor
Bronco Guru
Indianapolis
Joined: Dec 03
Posts: 4,812
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THere are a couple of charts floating around that give the optimal gear ratios for tire sizes. I would think that you would want at least 4.56 gears, if not taller. Depending on your suspension, it may not have very good highway manners; let us know what you decide and how it turns out/handles on the highway. Good luck.
Here is a prior thread where this was discussed, I believe you can find a chart here too. http://www.classicbroncos.com/forums...ar+ratio+chart |
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12/14/04, 05:41 PM
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#6
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Bronco Guru
Some Dude
Somewhere
Joined: Apr 02
Posts: 2,447
My Gallery
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35's at the moment, goin to 37's and staying with my current 4.56's  |
Red 77: SOLD
Green 77: SOLD
Looking again.
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12/14/04, 06:58 PM
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#7
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Guest
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If you want to play, check this out....
Gear Calculator Updated Link
Let me know if you need something added.
James
THIS POST WAS EDITED TO UPDATE THE URL...
Last edited by Miley; 02/06/05 at 11:10 PM..
Reason: Updated the URL
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12/14/04, 09:08 PM
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#8
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Sr. Member
Check out Broncoholics.com!
Lake Elsinore, CA
Joined: Jun 03
Posts: 856
My Gallery
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4.88s would be the best of both worlds.
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Scotty
72' Sport. 302, Truck Avenger carb, NV4500, Atlas 4.3, 5.13s, detroits, 36" Iroks, Champion Beadlocks, Superiors, CTMs, F150 4x4 box, TRO. yada, yada, yada....
www.broncoholics.com
My RigRater Score: 1002RRv1.0 with a BOA of 28.27
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12/14/04, 09:19 PM
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#9
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Full Member
Chico
Joined: May 04
Posts: 325
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Very cool link!
That just what I was looking for.
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1969, 351-w,33's, np-435,
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12/14/04, 09:26 PM
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#10
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Sr. Member
Broncos Rule!
Northern California
Joined: Jan 02
Posts: 641
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I run 4.88s with my 37s.
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12/14/04, 09:45 PM
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#11
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Sr. Member
The Early Bronco is not a matter of life and death, it's much more important!
Steamboat Springs
Joined: Jul 04
Posts: 798
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Miley that is a very cool link. You should put that in the tech section. You have made all our lives easier, now we don't have to do the math anymore, where were you about two months ago when I was trying to decide which tranny to go with? I had gear formulas everywhere.
Thanks again Miley very cool.  |
Sports is my religion, just give me a beer and prop me up in front of a TV on Saturday and Sunday.... Go Red Sox!!!...Go Broncos!!!
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12/15/04, 09:24 AM
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#12
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Contributor
Old Bronco Guy
Broncos Rule! WildBill's 66
Topeka Kansas USA
Joined: Jun 01
Posts: 6,775
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12/15/04, 09:54 AM
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#13
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70' restomod,68' crawler
econo box crusher!
san diego
Joined: Aug 01
Posts: 1,927
My Gallery
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i have 4.56`s with my 37" mtr`s. i would have went with 4.88`s but with an atlas and 500hp on tap i think i`ll have plenty of power to turn them. |
Building 2 is a lot tougher than I think. 
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12/15/04, 09:59 AM
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#14
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Full Member
Chico
Joined: May 04
Posts: 325
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Hey Sicaz66..........Do you have any pic's of your rig? I 'm going full length axels also, and would like to see how yours came out.
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1969, 351-w,33's, np-435,
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12/15/04, 10:03 AM
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#15
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Sr. Member
Folsom, Ca
Joined: Aug 02
Posts: 660
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I have 4.88's now with my 37's. The 4.11's just were not cutting it.
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