Gear Change
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Gear Change
I have an F150 with 355 gears with the tow package I am looking to change the gears after reading a couple post with the 456 gears. I am wondering does this affect the transmission, the abs or the speedometer?
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Ok Bridge can you explain more on what you can do about it affecting the trans and speadometer. Will it hurt the tranny with the new gears? If you get a tuner will it help with the tranny and the speedometer?
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From: Richmond, BC
I would think the new gears wouldn't have any negative impact on the transmission. Your shift points will be at much lower speeds and you will greatly increase your torque at your wheels, so there is the chance that you could pull something too heavy and cause damage. Usually it is the axles and such that you hear about problems with after a gear change.
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Maybe I will stick to the 373 gears instead of going to those new 456 gears. I know there was a post that a member put on here about the gear change he did. I don't remember if he mentioned anything about the gears interacting poorly with the tranny.
Hunt3r what problems have you heard of with the axles after doing a gear change?
Hunt3r what problems have you heard of with the axles after doing a gear change?
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From: Richmond, BC
Nothing specific to your truck. When I had changed the gears in my Jeep to 4.56 I was told to go with the stronger chromoly shafts because, according to the guy at the gear shop, the factory shafts would not stand up to the extra torque.
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From: Top Of The World, TN
If you change your gears, it is well worth the money to invest into a programmer (actually - well worth it if you change your gears or not). By going to 411s or 456s (or 373's for that matter), you will want to be able to adjust your shift points and shift firmness in order to take some stress off of the tranny.
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I am already planning on getting a tuner. I think down the road I will replace the gears. I am hoping to see some better gas mileage after doing the gears. I'm sure I will see some improvement once I get the tuner.
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From: Kelso, Washington
2nd that.
I have 4.56's, and 35" tires. I have an Edge to adjust for the 2. I haven't had any tranny problems at all. Do you have factory size tires? If so, just a heads up, with 4.56's at 75 mph, you'll be pushing over 2500-3000 RPM. Even with my 35's, I spin about 2300 rpms at 75.
I have 4.56's, and 35" tires. I have an Edge to adjust for the 2. I haven't had any tranny problems at all. Do you have factory size tires? If so, just a heads up, with 4.56's at 75 mph, you'll be pushing over 2500-3000 RPM. Even with my 35's, I spin about 2300 rpms at 75.
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You get better gas mileage with the 4.56's and you run higher RPM's that doesn't make sense to me. I was planning on getting a tuner for my truck. I also wanted to do a 6" lift and put 35's on it. I'm not sure what my RPM's are when doing 75 with my 3.55 gears I will have to check that out. What do you think if I just put some 3.73 gears or maybe 4.10's? Will that help the truck in gas mileage? Also would it be good to change the gears if I was looking to do some 4wheelin?
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OptimusF150, where are you buying your gears from? I just put a 6" lift and 35's on my truck and I'm ready for gears now. 4wheelparts wants a little over 2 grand for everything plus a 3 year warranty and installation and I'm trying to see if there is a better deal somewhere.
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GDog68 I haven't done anything to my truck yet besides put a little bit bigger tires on it. I am still under warranty and waiting for it to be up before I do any mods. There was another tread on here about a guy who changed his gears to 4.56 and he said he paid around 1400 installed so 2000 sounds high. What lift did you go with because that is one of the first things I wana do to my truck.
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From: Kelso, Washington
You get better gas mileage with the 4.56's and you run higher RPM's that doesn't make sense to me. I was planning on getting a tuner for my truck. I also wanted to do a 6" lift and put 35's on it. I'm not sure what my RPM's are when doing 75 with my 3.55 gears I will have to check that out. What do you think if I just put some 3.73 gears or maybe 4.10's? Will that help the truck in gas mileage? Also would it be good to change the gears if I was looking to do some 4wheelin?
I paid 1600 installed. The gears were 900 bucks from 4x4land in Topeka, and they charged 700 for the install. I could probably find their number if you wanna call them.