diff ratio
Cargo Master
Joined: Jun 2002
Posts: 2,033
Likes: 32
From: Aurora,Colorado
4.09 front and 4.10LS rear. I got this combination in my 92 F150 and love it!! It isnt necessary to down shift if the speed is over 15 MPH and the truck is unloaded with this gearing and the 5.0.
And I have the short and light weight stock 235/75 x 15 tires and the top gear engine speed is 2250 RPM @ 60 MPH.
The overall height of your tires and the type of transmission would also be a factor in what axle ratio that would be best for your Bronco. You would want to go numerically higher with taller tires and numerically lower with shorter tires--if you could get shorter tires for the Bronco.
The Bronco weighs about 200-300 pounds more than my short bed/regular cab F150--but the 4.09/4.10 would still perk your Bronco up!!
And I have the short and light weight stock 235/75 x 15 tires and the top gear engine speed is 2250 RPM @ 60 MPH.
The overall height of your tires and the type of transmission would also be a factor in what axle ratio that would be best for your Bronco. You would want to go numerically higher with taller tires and numerically lower with shorter tires--if you could get shorter tires for the Bronco.
The Bronco weighs about 200-300 pounds more than my short bed/regular cab F150--but the 4.09/4.10 would still perk your Bronco up!!
Last edited by phoneman91; Sep 26, 2007 at 07:38 AM.
Hotshot
Joined: Jul 2002
Posts: 14,285
Likes: 12
From: Bend,OR
have you installed gears before? what are you driving?? what type of driving will you be doing. what size tires do you plan to run and what engine is in your rig? all these need answered to really give you the proper answer
Posting Guru
Joined: Nov 2004
Posts: 2,155
Likes: 1
From: sunny fla sometimes windy
http://members.optusnet.com.au/~zerosin/gearcalc.html Check this out and punch in your numbers!! You need to know your motors peak it is best to keep the motor in the meat of the powerband, Somewhere between the peak torque rpms and the peak HP rpms! If you want to pull people off the line go high(numerically) but you will lose top end speed and versa vice!! I would say go with a lower(numerically) more highway gearing because if you are off road, you always have LOW range to drop your final drive ratio
You will end up with better road mileage (as long it's not too high) and if you need pulling power drop to 4lo and go!!
You will end up with better road mileage (as long it's not too high) and if you need pulling power drop to 4lo and go!!
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Posting Guru
Joined: Aug 2007
Posts: 1,025
Likes: 1
From: Colorado Springs
goin to be takin front and rear diffs out of bronco including the transfer case and installing in 96 f150 figured since they were bronco parts some one here might have more knowledge.
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Posting Guru
Joined: Aug 2007
Posts: 1,025
Likes: 1
From: Colorado Springs
would like to use same ratio in front and rear truck is used for lawn work trail work (the locale mud holes) and some search and rescue alsow assist locale law enforcment.
Posting Guru
Joined: Jan 2004
Posts: 2,105
Likes: 3
From: Anchorage Alaska
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Posting Guru
Joined: Aug 2007
Posts: 1,025
Likes: 1
From: Colorado Springs
would this be a good ratio for hight torque not to woried about the speed plannin on runnin 35's
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Hotshot
Joined: Jul 2002
Posts: 14,285
Likes: 12
From: Bend,OR
what year is your bronco?? you havent answered any of my questions in above post.
if you plan on running 35's 4.56 or even 4.88's. especially if you have a 302 under the hood , its a rev happy motor and it wouldnt bother it one bit. im conserned with this axle swap thats why i need to know what year rig your taking them out of.
if you plan on running 35's 4.56 or even 4.88's. especially if you have a 302 under the hood , its a rev happy motor and it wouldnt bother it one bit. im conserned with this axle swap thats why i need to know what year rig your taking them out of.
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Posting Guru
Joined: Aug 2007
Posts: 1,025
Likes: 1
From: Colorado Springs
every thing is goindg to be goin in to a 96 f150 with th l6 4.9 5speed not shure what the donor vehicle is going to be though probly a 93 bronco pull a part in my area has a good number of them.
Hotshot
Joined: Jul 2002
Posts: 14,285
Likes: 12
From: Bend,OR
most common for the bronco/f150 is 3.55. if it came with 4.10's it was a special order option. late 70's broncos had 3.50's up till around 84. some running the 300-6 engine had a 3.08 ratio as well. but again this was rare.