GEARS GEARS GEARS, Please read before posting gear questions - Page 5 - Ford Bronco Forum
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post #81 of 330 (permalink) Old 03-28-2007, 07:00 PM
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Originally Posted by LSAtexan$x$ View Post
thanks, would 4.88s be better then?? or 410
4.88 would be o.k. since you have the OD. If you have an 8.8 rear, you may want to go with a newer carrier because earlier 8.8 carries had a smaller cross pin. Also use a solid spacer rather than a crush sleeve on the pinion.

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post #82 of 330 (permalink) Old 03-28-2007, 08:05 PM
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it will prolly be a 14bolt but i do have 4.88s for an 8.8 i could use, why a solid spacer rather than a crush sleeve, and the carrier i have has the 7/8 cross pin isnt that the big one

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post #83 of 330 (permalink) Old 03-29-2007, 04:07 PM
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Originally Posted by LSAtexan$x$ View Post
it will prolly be a 14bolt but i do have 4.88s for an 8.8 i could use, why a solid spacer rather than a crush sleeve, and the carrier i have has the 7/8 cross pin isnt that the big one
If you are using big tires they can crush the crush sleeve more which can damage your rearend. The solid sleeve eliminates that possiblity.

The 7/8 cross pin is the big one.

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post #84 of 330 (permalink) Old 05-06-2007, 08:36 PM
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I have an 88 f150, 302 with 4" lift and 33's(12.50). I want to do gears, but would 4.88 be too much? Currently i have an AOD, and never use the overdrive, and do a lot of in town driving. Soon will be swapping in a C6. Will 4.88's be too much? During hunting, I drive 10-20 miles a day highway, will the 4.88's really kill my gas mileage?

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post #85 of 330 (permalink) Old 05-06-2007, 09:49 PM
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4.88's with 33's and a C6, will most definitely hurt your gas mileage.

Taking away an overdrive/lockup converter transmission will hurt your mileage to begin with. Then 4.88's which are definitely overkill for 33's, will hurt it. 4.10's are plenty for 33's.

With a C6, 4.88's, and 33's, you'll be lucky to do 60mph, at like 3800rpm or something.

But it'll be faster then shit off the line.

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post #86 of 330 (permalink) Old 05-07-2007, 02:35 AM
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maybe 4.56's but 4.88 will kill you with only 33's. If you are going to get bigger tires, then that would be different.

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post #87 of 330 (permalink) Old 06-05-2007, 04:18 AM
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so would driving 35" tires with 4.10 gears give you better gas mileage than if you had 4.56s? or is it the other way around. i know 4.56s would give you more grunt...




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post #88 of 330 (permalink) Old 06-06-2007, 09:35 PM
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I just got done reading this thread for probably the third time and each time I just get more and more information. This summer I will be running 33's with a 4 inch lift, and I was wondering if there will be that much of a difference by running stock gears? I will be mostly on the pavement but the occasional mudding every few months or so. Thanks for the help

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post #89 of 330 (permalink) Old 06-06-2007, 10:40 PM
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so would driving 35" tires with 4.10 gears give you better gas mileage than if you had 4.56s? or is it the other way around. i know 4.56s would give you more grunt...
you would get better gas mileage with the 4.10 gears because your rpm range would be lower.

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post #90 of 330 (permalink) Old 06-07-2007, 01:08 AM
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you would get better gas mileage with the 4.10 gears because your rpm range would be lower.
but it would be slower off the line? seems like in my situation that would be the better gear to go with 35s since id be driving my bko everyday and on the freeway a lot.

thanks scott!




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post #91 of 330 (permalink) Old 08-02-2007, 02:42 PM
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ok, i can't find the site i used before to determine correct gear size for 33's. stock size on my Bronco is 265/75 15's (30.6 in tire). i think it was something like a 4.06 gear but i think i calculated that for 235/75 15's (what is currently on my Bronco) before i realized that those tires weren't the stock size.

any help?

oh and the door jamb axle code is 19
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post #92 of 330 (permalink) Old 10-14-2007, 07:50 PM
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wow this was really helpful i am glad i researched ~!

!http://www.supermotors.net/17593

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how the f**kkkkkkkk do you guys see all of this? im 16.. (in a few days) is this what i have to look forward to when i grow up?
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post #93 of 330 (permalink) Old 10-17-2007, 04:45 PM
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Okay so im running 33's on 3.55 gears ATM. I think i might upgrade eventually to 35's. Based on the informatin i read in this thread the best thing for me to do with what i use my bronco for would be to:

A. If i stick with 33's i should eventually upgrade to 4.10 gears for maximum performance,the best gas milage possible, and to put the least amount of stress on my engine/tranny.

Or

B. If i upgrade to 35's then i should install 4.56 gears for the same overall performance as the 33's and 4.10 gear setup as stated above.

Now, what if i want the best combination of highway/city driving and offraod performance and i upgrade to 35's? Would 4.10's give me the best RPM range and gas milage on the highway and still get me through the rough shit on the trail when running 35's or will 4.56 gears be a better gear for this application?
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post #94 of 330 (permalink) Old 10-17-2007, 05:20 PM
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4.56 gears and running about 65 miles an hour will yield the best mileage results.

4.10s and 35s will make your city mileage suffer compared to 4.56, and will only gain about .5 mpg on the highway. Not to mention, you will regret the 4.10s every time you start up a steep hill...

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post #95 of 330 (permalink) Old 10-17-2007, 05:46 PM
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thanks hopper, i was wondering this too.



Quote:
Originally Posted by Hopper View Post
4.56 gears and running about 65 miles an hour will yield the best mileage results.

4.10s and 35s will make your city mileage suffer compared to 4.56, and will only gain about .5 mpg on the highway. Not to mention, you will regret the 4.10s every time you start up a steep hill...




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post #96 of 330 (permalink) Old 10-17-2007, 05:48 PM
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honestly its a toss up, I tow trailers up hills with 4.10s and it goes just fine, I also cruise at 70 with decent mileage. And on the trail just throw it in 4lo and forget about what gears you have. Keep in mind that when your 35s wear down to 75-50% tread, your gearing will be exactly stock with 4.10s. Either way its better than 3.55s though.


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post #97 of 330 (permalink) Old 10-17-2007, 07:06 PM
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I got a C6 in my 89 and im running 35's.

Most people say go with the 4.56's, but since i have no overdrive would i want to go with 4.10s? I was pullin 3k RPM at about 75 mph on the freeway, so how fast would i be able to go with 4.56's?

Also, is it ok to run at 3k RPM constant like that?
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post #98 of 330 (permalink) Old 10-17-2007, 07:20 PM
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You want 4.10s at most Bonzai. 4.56 would be way too deep with no OD. I don't like to run the engine over 2500 RPM for extended periods of time, but I'm really easy on it...

What gears do you have? You should be running about 2700 or so RPM at 75mph.

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post #99 of 330 (permalink) Old 10-17-2007, 07:26 PM
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Quote:
Originally Posted by Hopper View Post
You want 4.10s at most Bonzai. 4.56 would be way too deep with no OD. I don't like to run the engine over 2500 RPM for extended periods of time, but I'm really easy on it...

What gears do you have? You should be running about 2700 or so RPM at 75mph.
i got 3.55s...i think. I bought the truck 2 or so years ago and for the most part i dont know whats in it from the previous owner. But im pretty sure the previous owner ran 35's, so i wonder if he bothered to regear...

My K&N is completely CAKED with mud, im wondering if thats making the engine work harder??
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post #100 of 330 (permalink) Old 10-17-2007, 08:22 PM
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According to my calc:

~2700 RPM @ 75 w/3.55s

~2900 RPM @ 75 w/3.73s

~3200 RPM @ 75 w/4.10s

Does it feel gutless around town? Is your speedo correct? It might have 3.73s...

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