Switching Out Rear Ends?
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Freshman User
Joined: Jul 2003
Posts: 45
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From: Piedmont
Switching Out Rear Ends?
I was thinking about swaping the rear end on my 86 F-150(2WD) for one with 4.10 gears or 3.73's. I'm not sure what gear I have now but I know it is very high, around 3.08 or higher. It has a 3spd with overdrive straight drive and I was wondering if this would cause any problems with switching things out. I know of a 9" rear end with 4.10's in it and I wanted to just swap the entire complete axles out, without paying someone to regear.
Would this work? Or would 4.10's with a 3spd w/Overdrive be way to low of a gear?
Any suggestions?
Thanks for the help!
Would this work? Or would 4.10's with a 3spd w/Overdrive be way to low of a gear?
Any suggestions?
Thanks for the help!
Senior User
Joined: Jun 2002
Posts: 333
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From: Carlsbad TX
Switching Out Rear Ends?
What's the truck used for?
If the years are compatible, I don't see any problem with it. I would measure, and remeasure to make sure of the fit. Check u-joint size and eveything else you are going to unbolt ti be sure you don't run into any problems. 3.08's to 4.10's is a noticable change. You're really going to notice the differance in gas and performance as compared to what you are used to.
If the years are compatible, I don't see any problem with it. I would measure, and remeasure to make sure of the fit. Check u-joint size and eveything else you are going to unbolt ti be sure you don't run into any problems. 3.08's to 4.10's is a noticable change. You're really going to notice the differance in gas and performance as compared to what you are used to.
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Freshman User
Joined: Jul 2003
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From: Piedmont
Switching Out Rear Ends?
I am hoping it really want effect my gas mileage. Most of my driving is done around 55-60mph or less. My current mileage is about 13-14 all of the time. I regeared my jeep to 4.10's and it use to have 3.07's and the gas mileage hasn't changed at all around town and highway is only about .5 to 1mpg less. I am mainly concerned with speeds around 65-70. I rarely use my truck on the highway but when I do I don't want to turn so many rpm's that I burn the motor up
Since most of my driving is at slower speeds I am thinking it may actually improve my gas mileage. The high gear I have now is really hard on gas because I live in an area with a lot of hills and it will NOT pull up any of them. I usually use 3rd gear all of the time under 60 mph because of the lack of power. If I am on the highway (on flat ground) going 65 mph or more I will use OD but I still have to gear down going up hills.
Any more suggestions?
Thanks for the info
Since most of my driving is at slower speeds I am thinking it may actually improve my gas mileage. The high gear I have now is really hard on gas because I live in an area with a lot of hills and it will NOT pull up any of them. I usually use 3rd gear all of the time under 60 mph because of the lack of power. If I am on the highway (on flat ground) going 65 mph or more I will use OD but I still have to gear down going up hills.
Any more suggestions?
Thanks for the info
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Joined: Apr 2003
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Switching Out Rear Ends?
FarmF-150, I was wanting to sawp out the rear member also, but just the opposite as you. I want to go to a higher gear ratio because I have so much power(I don,t even use 1st gear unless towing.) and much of my driving is highway driving.
I have an 1986, F250, 7.5L,4-SP and I was told that it had a 4.11 rear gear. It may actually be a 4.10 if that is ford built.
Where are you located? I'm near Austin, TX. Possible swap?
I have an 1986, F250, 7.5L,4-SP and I was told that it had a 4.11 rear gear. It may actually be a 4.10 if that is ford built.
Where are you located? I'm near Austin, TX. Possible swap?
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Freshman User
Joined: Jul 2003
Posts: 45
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From: Piedmont
Switching Out Rear Ends?
Thanks for the advice mustange70, I am wanting to go with 4.10's.
bmuse: I live in NC, so a swap would be very difficult. I wish you lived a little closer because I would take you up on that offer!!!! It sounds like you have the exact set up I need and the same goes for mine for you. d#$n!
Thanks everyone!
bmuse: I live in NC, so a swap would be very difficult. I wish you lived a little closer because I would take you up on that offer!!!! It sounds like you have the exact set up I need and the same goes for mine for you. d#$n!
Thanks everyone!
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Senior User
Joined: Jun 2002
Posts: 333
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From: Carlsbad TX
Switching Out Rear Ends?
I gues I got lucky. My 86 4x4 with 4spd and 460 came with 3.55's. Right smack in the middle.
Hey bmuse, I'm over here near San Angelo Tx. I've got a few buddies with parts, but everyone has like 4.10's for towing. Sorry.
Hey bmuse, I'm over here near San Angelo Tx. I've got a few buddies with parts, but everyone has like 4.10's for towing. Sorry.