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View Poll Results: What gear ratio do your run with your 35" tires
4.10 75 44.12%
4.56 58 34.12%
Stock gears 23 13.53%
Other 14 8.24%
Voters: 170. You may not vote on this poll

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  #1  
Old 05-01-2010, 06:53 PM
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srobertsfsj srobertsfsj is offline
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What gears with with 35" tires?

Using this calculator http://www.grimmjeeper.com/gears.html I come up with 4.10 being the closest match to stock RPM at 65mph and 35's. I am on the fence with upgrading to 4.10 or 4.56 to get a little more power. I was wondering what you guys are running with your 35" tires and why?
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  #2  
Old 05-01-2010, 06:54 PM
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What is you intended use for your vehicle? Highway? Off road only?
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  #3  
Old 05-01-2010, 06:55 PM
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srobertsfsj srobertsfsj is offline
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50/50 offroad/highway. Nothing extreme offroad tho, maybe 5 to 8 rated trails.

This is a Waggy with 727/NP228
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'86 Grand Wagoneer Super Chief 360 / TBI / WT conversion / 35x12.5x16 BFG Mud-Terrains (Project Link)
http://www.cfsja.org / http://www.fsjnetwork.com

"After years of being paranoid about my Jeep’s temp going towards that 220F mark, I’m realizing that if it was real problem, Jeep engineers would have painted that area RED." - FSJ Guy





Last edited by srobertsfsj : 05-01-2010 at 07:01 PM.
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  #4  
Old 05-01-2010, 07:39 PM
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4:10 are your best bet

with a 3 speed It's going to be a singing @ highway speeds tho 3:73 might be a better thought
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  #5  
Old 05-01-2010, 07:44 PM
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Heavy_Metal_Thunder_81 Heavy_Metal_Thunder_81 is offline
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3.73 would not be ideal for 35s since your stock gear ratio is probly 3.31 or 3.07 id go with the 4.56s
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  #6  
Old 05-01-2010, 07:44 PM
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srobertsfsj srobertsfsj is offline
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Correct my stock gears are 3.31's.
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'86 Grand Wagoneer Super Chief 360 / TBI / WT conversion / 35x12.5x16 BFG Mud-Terrains (Project Link)
http://www.cfsja.org / http://www.fsjnetwork.com

"After years of being paranoid about my Jeep’s temp going towards that 220F mark, I’m realizing that if it was real problem, Jeep engineers would have painted that area RED." - FSJ Guy




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  #7  
Old 05-01-2010, 08:07 PM
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4.10's would put your RPMs pretty close to stock waggy with 3.31's. Just a hair higher on the freeway. Given the extra rolling resistance of bigger tires, that's probably about right if you're shooting for stock levels of performance.
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  #8  
Old 05-01-2010, 08:09 PM
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I had 35s on my 75 Wag with 4.10s and it wasn't too bad for highway cruising and still did fine offroad.

I would only run 35s and 4.56s with OD.
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  #9  
Old 05-01-2010, 09:43 PM
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Heavy_Metal_Thunder_81 Heavy_Metal_Thunder_81 is offline
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Quote:
Originally Posted by JohnnyJ
I would only run 35s and 4.56s with OD.
True, thats why I voted 4.10...forgot its a DD and a 3spd
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1979 Cherokee Golden Eagle - 7" lift, 35x12.5x15
AMC 360 - 4180, TFI, Headers, Dual Exhaust
TH400 - Shift Kit, Deep Pan, Aux Cooler
D20 - Twin Stick'd
F D44 - 3.54, Open
R D44 - 3.54, Lock'd

1984 J10 - Parts
1979 Cherokee Chief - Parts
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  #10  
Old 05-01-2010, 09:57 PM
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Talking 4.10

The strongest combination is 4.10 if you change ratio its perfect time to install lockers, its the same amount of work

My 75 Wagoneer, I changed from 3.54 to 4.11 and installed ARB lockers, tires 36x14.5x15 perfect combination very capable offroad. Freeway performance was like stock, fuel consumption 16.2 MPG in 2WD in winter 9.2 MPG in 4WD
I did not renew the ball joints in the Dana 44 so I ripped off the right front wheel and right drive shaft....
I never replaced the right side broken drive shaft just used it as 3WD until I sold it, well this is about 19 years ago... (360/T18/Dana20)

Now lets see if history repeats its self with the Dana 60, 30 spline outer shafts...
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  #11  
Old 05-03-2010, 08:55 AM
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I'm running a short 35" and 4.10's and it's spot on.
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  #12  
Old 05-04-2010, 02:38 PM
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I was gonna go 4.56 for 35s but found it was easier and cheaper to find axles with 4.10 and potentially a locker already installed then setting up axles from scratch with 4.56 gears.
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  #13  
Old 05-05-2010, 11:42 AM
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I'm running my stock 3.31 gears with 35's on my 80 chero 4 speed. Does real well on gas. Cruises along not screaming at 55-70 MPH and I can still spin the tires.
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  #14  
Old 05-06-2010, 09:00 PM
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i went with 4.56 in my truck with 35" tires.

My buddy Kevin went with 4.10 and wishes he had 4.56

it winds a little high at 85 mph but when wheel'n it is good to have the gears.
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  #15  
Old 05-08-2010, 12:09 AM
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I went with 4:30's (split the diff between the 4:10 and 4:56). When I get it running good I will post, but around the neighborhood it runs much better than the old 2:89's did!
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  #16  
Old 05-08-2010, 05:30 AM
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I was going to say what j10jim said, just split the difference (4.27 or 4.30 depending on who you go through for gears). You will still have teh gearing for off road and your onroad RPMs will not suffer that bad.
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  #17  
Old 05-08-2010, 10:47 AM
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srobertsfsj srobertsfsj is offline
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Quote:
Originally Posted by j10jim
I went with 4:30's (split the diff between the 4:10 and 4:56). When I get it running good I will post, but around the neighborhood it runs much better than the old 2:89's did!

Hmm, interesting, didn't even know I could get 4:30 gears. Looks like they are a bit more and would probably be harder to find used. But no I have an even tougher decision, lol.
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'86 Grand Wagoneer Super Chief 360 / TBI / WT conversion / 35x12.5x16 BFG Mud-Terrains (Project Link)
http://www.cfsja.org / http://www.fsjnetwork.com

"After years of being paranoid about my Jeep’s temp going towards that 220F mark, I’m realizing that if it was real problem, Jeep engineers would have painted that area RED." - FSJ Guy




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  #18  
Old 05-08-2010, 09:42 PM
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Quote:
Originally Posted by srobertsfsj
Hmm, interesting, didn't even know I could get 4:30 gears. Looks like they are a bit more and would probably be harder to find used. But no I have an even tougher decision, lol.

I don't think you can get them for the AMC20. For the Dana 44, you can get 4.27's which are close enough.
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  #19  
Old 05-09-2010, 09:04 PM
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I went 4.10's with 35's and wish I woulda went 4.56's. But my jeep never sees the freeway.
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  #20  
Old 05-11-2010, 11:48 AM
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if i remember right my 90 gw came with 2.72. yuck!

i went with 3.31 and run 35's most of the time.

i like it well enough for most situations...but sure wish i'd put in a lower gear when i pull my 4-lo lever.
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