Axle gears question
Thread Starter
|
Freshman User
Joined: Dec 2004
Posts: 47
Likes: 0
From: Mid Missouri
Axle gears question
I am not sure if I am in the right section on this. But I am wanting to regear my 95 Bronco, it has stock 3:55's in it now with 31's. I dont think I will go any larger then 32 inch tires. I am wanting a better gear for low end take off and pulling. But I still want it to be good at 70 to 80 mph on the highway. Righ now it is boggy on take off and sluggish on long hills. I have advanced the timming 3 degress, and added a K&N cone filter. It already has one cat removed and flowmaster cat back system with 3 inch inlet and 2 1/4 outlets. What would you guys recomend for a good workable gear ratio? Thank you
Senior User
Joined: Nov 2001
Posts: 161
Likes: 0
I have a 1990 F-150 2wd, I am currently running 235-75R15's (about 29"). My truck came with 3.08 gears and a open differential. I had 3.73's and a limited slip unit installed. I was amazed at the performance gains, and get this MPG increase. Oh by the way my truck has a 300 inline six. Hope this helps you. The gears were Dana and the Limited slip was Ford/OEM.
Thread Starter
|
Freshman User
Joined: Dec 2004
Posts: 47
Likes: 0
From: Mid Missouri
Yes actually it does, I have been thinking along the lines of a 4:10 gear set. How does yours do on the highway at higher MPH's, does it seem like it is over reving or does it seem ok? Thanks for your imput.
Senior User
Joined: Nov 2001
Posts: 161
Likes: 0
Since the max torque (265 lbs) is produced at 2000rpm. Going about 65-75 puts you right there. However I am running 29" tires and 3.73 gears. The 4.10 with maybe a 32" would be about the same. Here's you a website to play around with seeing how much rpm you would be turning with a certain gear ratio and tire size. Before you use it you will need to know you transmission ratio, mine is a E4OD automatic (3rd gear is 1.00 and overdrive 4th is .71), also for the trasnfer case ratio you can just put in 1.00 for 2wd mode.
http://www.4lo.com/4LoCalc.htm
http://www.4lo.com/4LoCalc.htm
Thread Starter
|
Freshman User
Joined: Dec 2004
Posts: 47
Likes: 0
From: Mid Missouri
I was wondering how the RPM would drop with the overdrive. Thank you for the web site info. So you think a 4.10 would be ok then? I want to make sure I am not over RPMing the motor, but in the same aspect I want to make sure if I change the gears I am actually going to make a good differance.
Oh by the way, I though the transmission ratio on a E4OD had a .67 ratio in overdrive? Just wondering, I guess it is so close it doesnt really matter. Anyway thanks for the info.
Oh by the way, I though the transmission ratio on a E4OD had a .67 ratio in overdrive? Just wondering, I guess it is so close it doesnt really matter. Anyway thanks for the info.
Senior User
Joined: May 2004
Posts: 102
Likes: 0
The 4.10s were available in Broncos up until 1993 with the I6 or 302, so it should work fine with yours and not overrev the engine if you have one of those engines. Heard others say not to do it with the 351, but I believe they meant without the overdrive. I believe that pcman is right that the overdrive is .71 in the E4OD.
I am looking at going to either 4.10s or 4.56s in my 1996. I do rock crawling (not quite Moab stuff, but enough to get a tire off the ground fairly often) and tow a 6500# travel trailer occasionally, and although the Bronco does okay, I would like more oomph. Just blew out the rear 3.55s so figured it's a good time to change'm.
Let me know what you figure out. Thanks.
I am looking at going to either 4.10s or 4.56s in my 1996. I do rock crawling (not quite Moab stuff, but enough to get a tire off the ground fairly often) and tow a 6500# travel trailer occasionally, and although the Bronco does okay, I would like more oomph. Just blew out the rear 3.55s so figured it's a good time to change'm.
Let me know what you figure out. Thanks.
Thread Starter
|
Freshman User
Joined: Dec 2004
Posts: 47
Likes: 0
From: Mid Missouri
My thoughts are to go with the 4.10's and a light shift kit. That way I can still use it on the highway also. Maybe add a good cam later in the summer. I am not as worried about gas mileage as I am about over working the motor. I just want to have better take off and hill pulling, right now it down shifts on long hills way to much and strains to make it over the top, let alone with the weight of a trialor on it. I was hoping a lower gear would help fix that problem.
Just wondering what size tires are you running on yours?
Just wondering what size tires are you running on yours?
Trending Topics
Senior User
Joined: May 2004
Posts: 102
Likes: 0
I'm running 31x10.50s. The stock 4.10's in Broncos came with shorter tires, so I'm sure I'm safe there, just not sure about going to a 4.56. (The Broncos with 4.10's and no overdrive - now those are screaming at 75mph comparatively.) I also might go to a 32(x11.50), but probably not any taller. I am surprised you see any problem climbing hills in Missouri. My 302/E4OD/3.55 combo does pretty darn good up here in Colorado, even on 7% grades at 8-9000' elevation, all considered. (You have the 302?) Only mod on mine that should affect performance is a K&N Filtercharger system.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Postmaster
Joined: Dec 2002
Posts: 3,959
Likes: 9
From: USA
I would go with the 4.10 gears for tires up to 33" tall. 4.56's are also a choice if you want more torque than speed or if you want to increase the tire size to 33's or 35's. You will be fine on the rpms with either ratio if you have overdrive.
I'm running 4.56's with 33's in my F350. Originally came with 3.55's and was a real dog on the hills and especially when towing. Has alot of power now with the lower ratio gears
.
With 4.10's and a 0.71 overdrive ratio with stock tires, it's like having a non-overdrive trans and a 2.91 axle ratio. That's plenty of speed for the freeway. 4.56's and 0.71 overdrive is like having a 3.24 axle ratio without overdrive. Still high enough to cruise the freeway comfortably.
I'm running 4.56's with 33's in my F350. Originally came with 3.55's and was a real dog on the hills and especially when towing. Has alot of power now with the lower ratio gears
. With 4.10's and a 0.71 overdrive ratio with stock tires, it's like having a non-overdrive trans and a 2.91 axle ratio. That's plenty of speed for the freeway. 4.56's and 0.71 overdrive is like having a 3.24 axle ratio without overdrive. Still high enough to cruise the freeway comfortably.
Thread Starter
|
Freshman User
Joined: Dec 2004
Posts: 47
Likes: 0
From: Mid Missouri
I live in the Ozarks part of Missouri so I do have a few hills to climb in places, let alone I live in the country not in any towns. At highway speeds and in most places I dont have much problem, but it does lose alot when I hit a hill in overdrive. I had my horse trailor on it yesturday and it was a major dog just taking off, and getting up to any speed.
So with your guys help I think I will go to 4.10s in it. I appreciate everyones imput, and thanks again.
So with your guys help I think I will go to 4.10s in it. I appreciate everyones imput, and thanks again.