New Gears installed
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Senior User
Joined: Jun 2003
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From: Las Vegas
New Gears installed
Well I finally did it. Yep, I swapped out those nasty 3:31's for 4:10's and a limited slip. With 285-75-16 BFG AT's, the change was noticeable, but, not exactly what I expected...True, she moves off the line better, but I thought mid range and freeway was going to be better. I was afraid to go with 4:56's fearing they would be too low, but now Im wondering. What help would a chip provide, or even a F.I.P.K.? Any thoughts???
2001 Expy 4-corner air, 5.4 stock, 4:10 w/limited slip, 285-75-16 BFG AT's.
2001 Expy 4-corner air, 5.4 stock, 4:10 w/limited slip, 285-75-16 BFG AT's.
Logistics Pro
Joined: Oct 2000
Posts: 3,960
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From: All over Texas
New Gears installed
I was wondering when you were going to report back. I'm surprised that you don't sound more enthusiastic about your new gears, but remember your ratio is not really 4.10 but is closer to 3.73. In order to fully achieve this ratio, you'd have to reinstall the factory tires/rims or equivalent in height. A chip couldn't hurt. I'm a big believer after installing one (programmer) on my truck. I don't think an air intake will provide much of a boost.
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Senior User
Joined: Jun 2003
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From: Las Vegas
New Gears installed
golakers, it all depends on what tire size you are using. After Ford re-programed my computer I am pretty happy now. Some one else in here has a 4.6 with I think 285's on it, and they went 4.56's and said it was purfect. With that small motor you better determine what you are going to do with your Expy before buying 4.10's. Going from 3.31's to 4.10's and my tire size put me to about 3.70's. I paid about 1700 for my swap. Good Luck
Junior User
Joined: Apr 2003
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From: Redondo Beach
New Gears installed
I currently have 285/60-18 tires. My intended use is for pulling a pop-up camper. I just got back from a trip to Tahoe and and pulling the trailer darn near killed the turtle. Plus it drove me nuts. I don't camp frequently, but when I do I want to be able to pull 3000+ lbs without a problem. So, what do you think?
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Senior User
Joined: Jun 2003
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From: Las Vegas
New Gears installed
golakers, I would suggest talking to your gear shop. Like I mentioned, I have the 5.4, and I almost thought of going with 4.56's. I like the combo I have now, it has good all around power. Talk to your shop and let me know what they say.
Logistics Pro
Joined: Oct 2000
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From: All over Texas
New Gears installed
Originally posted by golakers
I was just quoted $1100.00 to go from 3:31 non-LS to 4:10 LS. Is this a good rate? Can I do this from home or do I need special tools?
I was just quoted $1100.00 to go from 3:31 non-LS to 4:10 LS. Is this a good rate? Can I do this from home or do I need special tools?
Your effective ratio is about 3.14:1 due to your oversize tires/wheels, hence your towing woes. If you go to 4.10's your effective ratio will be ~3.90:1. I think you'd be happy with this ratio if you do minimal towing. Is $1100 for front and rear or just rear? I was quoted between $1200-1300 for front and rear in my 4x4 with new bearings, etc. ToolTime mentioned $1700, but he also had a new posi unit installed with his gears.
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Logistics Pro
Joined: Oct 2000
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From: All over Texas
New Gears installed
Originally posted by ktmguy70
The price your quoting is installed correct?
Ron
99 Expediton
XLT
The price your quoting is installed correct?
Ron
99 Expediton
XLT
golakers, you asked if you could do it yourself....that depends if you have a good working knowledge of differential setups. Personally, I've rebuilt several engines but refuse to deal with trannies and differentials. My uncle builds race cars and he warned me that differential work is not for the typical weekend warrior.
Freshman User
Joined: Jun 2003
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From: South Carolina
New Gears installed
I agree, unless you do it all the time, for a living, setting up gears is a job best left for a pro. I built my own drag gar, did everything from scratch, (it's a tube chassis car) but I wouldn't TOUCH a set of gears, it must be absolutely perfect in order to get the wear patterns that you need in order to keep the gears running.
Get the ship with the guarantee on their work if you can...
Get the ship with the guarantee on their work if you can...
Junior User
Joined: Apr 2003
Posts: 98
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From: Redondo Beach
New Gears installed
Hey Tooltime, this is a good thread!
Buzzard, thanks for the sage advise.
$1100.00 is only for the rear w/LS installed. Is that too much?
3.90:1 is okay with me.
Should I have had the ECM recalibrated by FORD for the larger tires when I had them installed?
Would that have made a difference in my towing performance?
I'll go ahead with Bobby's advise and let someone else do the work plus get the guarantee!
Buzzard, thanks for the sage advise.
$1100.00 is only for the rear w/LS installed. Is that too much?
3.90:1 is okay with me.
Should I have had the ECM recalibrated by FORD for the larger tires when I had them installed?
Would that have made a difference in my towing performance?
I'll go ahead with Bobby's advise and let someone else do the work plus get the guarantee!
Logistics Pro
Joined: Oct 2000
Posts: 3,960
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From: All over Texas
New Gears installed
Buzzard, thanks for the sage advise. Your Welcome
$1100.00 is only for the rear w/LS installed. Is that too much?
Sounds OK since you're getting a new LS unit too. Gears and related parts are around $400, the new LS has to be ~$500, so labor of $200 sounds decent.
Should I have had the ECM recalibrated by FORD for the larger tires when I had them installed?
Not necessarily. You're only 5% off, so if you're doing 70, your speedo will show around 67.
Would that have made a difference in my towing performance?
You'll be in the engine's designed power range much more frequently.
$1100.00 is only for the rear w/LS installed. Is that too much?
Sounds OK since you're getting a new LS unit too. Gears and related parts are around $400, the new LS has to be ~$500, so labor of $200 sounds decent.
Should I have had the ECM recalibrated by FORD for the larger tires when I had them installed?
Not necessarily. You're only 5% off, so if you're doing 70, your speedo will show around 67.
Would that have made a difference in my towing performance?
You'll be in the engine's designed power range much more frequently.
Logistics Pro
Joined: Oct 2000
Posts: 3,960
Likes: 5
From: All over Texas
New Gears installed
Naw, I got a nicely equipped SR5 model. I just didn't see the need to spend over $40K for a new vehicle. Yeah, they ride and drive very nicely, but I'll still take my rugged Expy 4x4 and let the wife drive the kid hauler.
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