4:10 w/4:09 ?
Laughing Gas
Joined: Aug 2004
Posts: 1,138
Likes: 0
From: Yuba City, Ca
Yes & Yes! Yes you can run them together and Yes they should be exactly the same to prevent problems that will pop up. it's not good to have a mix of ratios. 4.10 should be with 4.10 and 4.09 should be with 4.09! Plain and simple.
1978 F-250 Ranger Explorer 4x4
351M, C6, Np205, D44, D60LS 4.10
Drive It Like You Stole It!!!
1978 F-250 Ranger Explorer 4x4
351M, C6, Np205, D44, D60LS 4.10
Drive It Like You Stole It!!!
Post Fiend
Joined: Mar 2002
Posts: 19,402
Likes: 38
From: Bonita Springs FL
What a bizarre answer. 
And slightly incorrect.
You CAN run slightly different axle ratios in the same truck and not have problems. They have to be within 1% of each other. Ford shipped trucks with 4.10's in the front and 4.11's in the back for years and years.
And slightly incorrect.
You CAN run slightly different axle ratios in the same truck and not have problems. They have to be within 1% of each other. Ford shipped trucks with 4.10's in the front and 4.11's in the back for years and years.
Hotshot
Joined: Dec 2003
Posts: 18,423
Likes: 9
From: iowa
Actually ford went farther than that (well actually all of them did) I have seen 3.92 against 3.89, and 355, against 3.50, and the typical was 4.11, and 4.09, basically stay within .1 or better yet .05, and you will be fine, you shouldn't be running them on dry pavement anyway because that is the only time the difference would be a problem, and when you have the choice run a slightly higher gear (numericallly lower) in the front this will help to keep you straight in slippery conditions.
Laughing Gas
Joined: Jul 1999
Posts: 1,048
Likes: 22
From: Lacey, WA
Hi,
The ratio difference is very common.
I have read that Ford designed it this way to maintain a minor amount of tension on the gears in the transfer case to prevent "gear slap" that would occur when getting on and off the gas pedal.
Take care,
Lee
The ratio difference is very common.
I have read that Ford designed it this way to maintain a minor amount of tension on the gears in the transfer case to prevent "gear slap" that would occur when getting on and off the gas pedal.
Take care,
Lee
Laughing Gas
Joined: Aug 2004
Posts: 1,138
Likes: 0
From: Yuba City, Ca
[QUOTE=andym]What a bizarre answer.
And slightly incorrect.QUOTE]
Sorry for the Bizarre answer. i just said that because it' best to have them the same. now didn't i say that you can't, right! ok then so why is this so "bizarre" sorry to offend you by saying what i said. reread my post, i don't see anything wrong with it. do you?
1978 F-250 Ranger Explorer 4x4
351M, C6, Np205, D44, D60LS 4.10
Drive It Like You Stole It!!!
And slightly incorrect.
QUOTE]Sorry for the Bizarre answer. i just said that because it' best to have them the same. now didn't i say that you can't, right! ok then so why is this so "bizarre" sorry to offend you by saying what i said. reread my post, i don't see anything wrong with it. do you?
1978 F-250 Ranger Explorer 4x4
351M, C6, Np205, D44, D60LS 4.10
Drive It Like You Stole It!!!
Elder User
Joined: Jan 2004
Posts: 887
Likes: 0
From: Colorado
All the 4x4 trucks ( not alot, but more than a handful) i have taken time to look at have had the slight difference, from the factory, so that is Perfectly Normal. Now, if you were to do an aftermarket swap, it might be best to go with the same gears front and back depending on your application. Im assuming since you didnt mention any aftermarket changes that you were wanting to know if this was normal from the factory.
---JOHN
---JOHN
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Hotshot
Joined: Dec 2003
Posts: 18,423
Likes: 9
From: iowa
Well the only thing I see wrong with your answer is it is confusing, contridictory, and wrong (or atleast partially) first you say he can run them, and then say that they must be the same, which is all of the above, first off they aren't the same even when the gear ratios are exactly alike, do to the added weight in the front end (assuming you have the engine in the front still) the affective diameter of the front tires is smaller by a miniscul amount but that amount makes the difference in the gear ratio different by more than the .01 difference in the gears, next if you are running them on dry pavement (the only time that you would have a problem with the difference in gear ratios in the first place, and a big no no to start with) then when you turn a corner the tires would track at a differnt place causing a much higher discrepancy causing a binding problem, and tire air preasures, and a dozen other things that would change the affective ratios, all add up to the fact that you don't have to have them exact, and infact they usually aren't more do to availability than any other issue, but still there none the less.
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Freshman User
Joined: Dec 2003
Posts: 33
Likes: 0
Thanks for all the info.In fact I am about to modify the ratios in my 96 bronco I,ve decided to go with 4.09 in the D44 front and 4.11 in the 8.8 rear the reason for the change is a bad bearing in the rearend its been howling for some time now and it finaly fell apart, I think its a good excuse for a gear change dont you!
Again thanks to all your help I was able to make a sound decision, unless youve got a 9" your willing to part with.
Thanks again,
FRDKPR
Again thanks to all your help I was able to make a sound decision, unless youve got a 9" your willing to part with.
Thanks again,
FRDKPR
Hotshot
Joined: Dec 2003
Posts: 18,423
Likes: 9
From: iowa
If I had an extra complete 9in, it would be in my wifes 89 bronco, but one from a F150 will bolt in minus the senser for the anti locks, and you will have to modify your driveshaft or find on from an 80-81 bronco with a 9in, so just go find any F150 with a 9, and you are good to go. Oh BTW when you do the gear change you might as well plan on replacing the axle bearings even if they aren't bad they are a bad design in that they use the axle as the inner race so if one goes out you have to buy a new axle shaft so since it's out replace them know. (these weren't one of Fords better ideas, and infact I am not sure it's even a ford rearend the axle bearings are Chevy part numbers for a 10 bolt rear)
Laughing Gas
Joined: Aug 2004
Posts: 1,138
Likes: 0
From: Yuba City, Ca
Originally Posted by monsterbaby
Well the only thing I see wrong with your answer is it is confusing, contridictory, and wrong (or atleast partially) first you say he can run them, and then say that they must be the same, which is all of the above, first off they aren't the same even when the gear ratios are exactly alike, do to the added weight in the front end (assuming you have the engine in the front still) the affective diameter of the front tires is smaller by a miniscul amount but that amount makes the difference in the gear ratio different by more than the .01 difference in the gears, next if you are running them on dry pavement (the only time that you would have a problem with the difference in gear ratios in the first place, and a big no no to start with) then when you turn a corner the tires would track at a differnt place causing a much higher discrepancy causing a binding problem, and tire air preasures, and a dozen other things that would change the affective ratios, all add up to the fact that you don't have to have them exact, and infact they usually aren't more do to availability than any other issue, but still there none the less.
1978 F-250 Ranger Explorer 4x4
351M, C6, Np205, D44, D60LS 4.10
Drive It Like You Stole It!!!
Post Fiend
Joined: Mar 2002
Posts: 19,402
Likes: 38
From: Bonita Springs FL
Originally Posted by f250rangerexplorer
Yes & Yes! Yes you can run them together and Yes they should be exactly the same to prevent problems that will pop up. it's not good to have a mix of ratios. 4.10 should be with 4.10 and 4.09 should be with 4.09! Plain and simple.
You didn't use the word "must". You said "should", qualified by "to prevent problems" when in fact there won't be any problems as everyone here agrees. "Should be" followed closely by "to prevent problems" is pretty close to "must" in my book.
Laughing Gas
Joined: Aug 2004
Posts: 1,138
Likes: 0
From: Yuba City, Ca
i agree and sorry to frdkpr. it wasn't a good day today and i'm sorry to everyone i have offended. i as a reread this i think that it's dumb. the entire bickerin was dumb. what i was trying to say is you can do whatever you want! yes they will work that way. Do they have to be exactly the same no but i prefer mine to be. so that solves that. i know that this isn't a excuse you acting the way i did but i thought that it was ridiculous. Enjoy the post that everyone has written, i know i do just not this thread. Sorry for the trouble.
1978 F-250 Ranger Explorer 4x4
351M, C6, Np205, D44, D60LS 4.10
Drive It Like You Stole It!!!
1978 F-250 Ranger Explorer 4x4
351M, C6, Np205, D44, D60LS 4.10
Drive It Like You Stole It!!!
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