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  #1  
Old 11-07-2013, 09:05 PM
Kaiser68 Kaiser68 is offline
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Default Gear ratio and 35s

I was about to pull the trigger on my 6'' BDS lift with 35 tires and 20" wheels, but a few days ago i came across the gear ratio debate and i havent found a good discussion for the 4th gens.

I havent been able to find my gear ratio yet. ill have to call the dealership tomorrow to find out, but hypothetically speaking...

If I have a 3.92 or 3.55 gear ratio would this be a problem running 35 tires and 6" lift? I realize bigger tires are going to strain the tranny i just dont want to go over board. whats everyones suggestion? am i fine to run 35s? or should i go 4" lift with 33s?
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Old 11-07-2013, 09:56 PM
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I'm running the equivalent to a 35" tire on my truck. I have 3.55 gears and I certainly did take a noticeable hit both in performance and fuel economy. Still a peppy truck to drive around and I have no problem beating my buddies '13 silverado. I think the hemi has enough torque to keep the wheels rolling without having the trans searching for gears. Plus, with the number of people on this site running over sized tires, I haven't seen many posts concerning trans issues.
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Old 11-07-2013, 10:30 PM
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What Hodge said. I have a 6" lift and 35's and 3.55 gears. The difference in performance was noticeable, but not huge. I'm fine with the way the truck runs though. Maybe down the road I may look into 3.92's, but for now the truck runs fine
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Old 11-07-2013, 10:51 PM
Grimminck11 Grimminck11 is offline
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If you want to know check your front diff it should have a sticker saying what gears, that how I found out about mine
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Old 11-07-2013, 11:21 PM
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Yup, I agree with hodge as well. I was running 35's with 3.55's on my old 4.7 and it was fine. Your truck won't have any issues with it. And with how much changing gears will cost on your truck, you're not going to feel the need to change them.
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Old 11-08-2013, 01:39 AM
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i just found my ratio it is 3.92. That is a relief at least especially with you guys saying your fine with yours at 3.55
lol sometimes i think reading these forums are a bad thing. gets a guy thinking to much!
well at least ive learned quite a bit so far though.
does a guy need to get a tuner if he gets tires? pros and cons if i do and dont?
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Old 11-08-2013, 12:00 PM
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You don't need a tuner... but it would definitely help. For one it will change the shift points and give you slightly more power and torque which will help mitigate the effects of going with larger tires. Plus it will allow you to recalibrate your speedo so that it is correct with the new tires. If you don't do it you're just going to have a bit more power loss, worse shift points, and an incorrect speedo and odometer.
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Old 11-08-2013, 08:30 PM
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For every inch you increase in diameter you will lose a .1 of your gear ratio if you go up to a 35 that 3 inch increase roughly you end up with 3.72 gear. Which is still a very good all around Daily driver gear. I was running a 04 f150 heritage 4x4 off road extended cab that weighed 4800# it had a 4.6 and 3.31 gear with 35" tires. Lol I went up 3 almost 4 inches I figured I was running a 2.89 On the highway I was running 70 mph at 1000 rpm my gas millage was awesome. When I was towing my gas millage sucked. But it was peppy as heal and still quick. This hemi is twice that truck and only weighs 1000 lbs more. It can handle probably 37 with stock 3.55 gear. And still be very fast. I had a 78 cj with a 304 v8. 255 gears and a 3 speed t400 trans in it. and that was sick. It had 35's on it. Couldn't keep the tires from spinning.
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