Hey gear experts!!!!
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Joined: Oct 2002
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From: Del Rio, Texas USA
Hey gear experts!!!!
guys just for my own info i swap my 3.73s to something better is this just a ring and pinion swap or do i have to change my front rear diff gears ( the ones inside the housing) I have an Auburn LS in the rear which im real happy with but if i order a set of like 4.56's will they run with that Auburn, I swear when i ordered the thing they asked what gear ratio i was running i told them 3.73. Im pretty clueless on this matter, help me out.
Jetjock16
Jetjock16
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Joined: Dec 2002
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From: IL, USA
Hey gear experts!!!!
jetjock16,
You wil have to swap the ring & pinion (which are in the housing) in the f & r. All you would need to get is both sets of ring and pinions and the rebuild kits.
Also, according to Auburn's site your rear diff works with all ratios.
I think that the front carrier won't need to be changed either but not positive.
FWIW, 4.56 will give you a little bit more gear than when your truck was stock with 31.6" tires and 3.73 gears.
Hope this helps.
You wil have to swap the ring & pinion (which are in the housing) in the f & r. All you would need to get is both sets of ring and pinions and the rebuild kits.
Also, according to Auburn's site your rear diff works with all ratios.
I think that the front carrier won't need to be changed either but not positive.
FWIW, 4.56 will give you a little bit more gear than when your truck was stock with 31.6" tires and 3.73 gears.
Hope this helps.
Last edited by DCSpecial; Apr 3, 2003 at 12:00 PM.
Senior User
Joined: Feb 2003
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From: Somewhere out there.
Hey gear experts!!!!
DCSpecial is correct the carriers are the same. Just get the same ratio for the front and rear. You will also have to re-program the computer or chip for the different gear or tires for proper speedo calibration.
Logistics Pro
Joined: Jan 2002
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Hey gear experts!!!!
Don't know if I am all wet but I thought there were ABS Tone wheel issues with low ratio gear sets?
Or do the companys now make the ring gear with a lip to put the original tone ring on? Sorry for getting nosey here, I am remembering things from a couple years back when I first got the truck
Or do the companys now make the ring gear with a lip to put the original tone ring on? Sorry for getting nosey here, I am remembering things from a couple years back when I first got the truck
Logistics Pro
Joined: Jan 2002
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Hey gear experts!!!!
Went off and did the search after my post..
I was remembering correct, but not totaly
A guy with really tall tires needed to get 4.88:1 gears and the only ones for the Ford rear axle had to be sent out to have the ring gear machined to fit the tone wheel, and they also had to modify the pickup placement to be in line with the tone wheel. Later in the thread the guys on the forum found new ring pinon sets that were designed specifically for the Ford stock ABS system to be retained.
Sorry if I stirred anyone up... seems that there are more than a few sources for the gear sets.
I was remembering correct, but not totaly
A guy with really tall tires needed to get 4.88:1 gears and the only ones for the Ford rear axle had to be sent out to have the ring gear machined to fit the tone wheel, and they also had to modify the pickup placement to be in line with the tone wheel. Later in the thread the guys on the forum found new ring pinon sets that were designed specifically for the Ford stock ABS system to be retained.
Sorry if I stirred anyone up... seems that there are more than a few sources for the gear sets.
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Joined: Oct 2002
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From: Del Rio, Texas USA
Hey gear experts!!!!
still trying to understand a few things here guys, really appreciate the help.... ive read before there will be no need to remap the computer for the speedometer as it just reads actuall rotation off the gear thas on the outside of the Carrier, that wont change at all, so the speedo wont be affected, i think that is the same tone ring you guys are talking about for the ABS? no? anyway i disconnected the ABS a long time ago, with our ABS and oversized tires the braking action sucked, works a hell of alot better without it, ANYWAY so i get new ring and pinion gears for the front and the rear, and replace them and use the stock front carrier assmebly and the Auburn Rear carrier and no internal mods will needed to be done to those gears?? is that what im to understand? if so im ready to order some gears!! Is there anything in between 4.30's and 4.56's seems like i would want something right in the middle i want to run close to the 3.73 gear ratio with 36 tires.
Jetjock16
Jetjock16
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Post Fiend
Joined: Dec 2002
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From: IL, USA
Hey gear experts!!!!
Jetjock16,
Actually 4.30s with your 36" PJs which according to PJ measure 36.125" would be as close to the same effective gear ratio as the stock 31.6" tires with 3.73 gears. I think you'd push a few more RPM w/the 4.30s & 36s than stock, but not by much.
4.56s w/ 38s would be close to the same effective gear ratio as a stock truck with the 31.6" & 3.73s
If you want a lower gear than stock performance, go with 4.56s.
Right as far as I know, no need to modify the carriers.
Just need the gears and rebuild kits.
That is the same tone ring.
Hope this helps.
Actually 4.30s with your 36" PJs which according to PJ measure 36.125" would be as close to the same effective gear ratio as the stock 31.6" tires with 3.73 gears. I think you'd push a few more RPM w/the 4.30s & 36s than stock, but not by much.
4.56s w/ 38s would be close to the same effective gear ratio as a stock truck with the 31.6" & 3.73s
If you want a lower gear than stock performance, go with 4.56s.
Right as far as I know, no need to modify the carriers.
Just need the gears and rebuild kits.
That is the same tone ring.
Hope this helps.
Senior User
Joined: Feb 2003
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From: Somewhere out there.
Hey gear experts!!!!
Jetjock wrote" ive read before there will be no need to remap the computer for the speedometer as it just reads actuall rotation off the gear thas on the outside of the Carrier, that wont change at all,"
Jet, anytime that you change the gear ratio or tire size you should get the computer updated for the new combination. On a 3:73 ratio the driveshaft turns 3.73 turns for every 1 revolution of the axle, the same goes for a 4:56 in that the shaft turns 4.56 for every axle revolution. The axle is directly connected to the tone ring in the rear, so you can see the relationship and the need for a calibration change. Now for the tire's, the computer looks @ rev's per mile, a smaller tire turns more rev's than a larger tire in 1 mile. So if you removed a 33" tire and installed a 40" tire and didn't change the speedo calibration.... On the odometer w/33" 1 mile would be 1 mile or 5280 feet. Throw on the 40's and no speedo change and you will travel roughly 6388 feet and the odo will still say 1 mile. The same calculation could be used for re-gearing. I hope this helps you to better understand the tire/gear relationship.
Jet, anytime that you change the gear ratio or tire size you should get the computer updated for the new combination. On a 3:73 ratio the driveshaft turns 3.73 turns for every 1 revolution of the axle, the same goes for a 4:56 in that the shaft turns 4.56 for every axle revolution. The axle is directly connected to the tone ring in the rear, so you can see the relationship and the need for a calibration change. Now for the tire's, the computer looks @ rev's per mile, a smaller tire turns more rev's than a larger tire in 1 mile. So if you removed a 33" tire and installed a 40" tire and didn't change the speedo calibration.... On the odometer w/33" 1 mile would be 1 mile or 5280 feet. Throw on the 40's and no speedo change and you will travel roughly 6388 feet and the odo will still say 1 mile. The same calculation could be used for re-gearing. I hope this helps you to better understand the tire/gear relationship.
Senior User
Joined: Feb 2003
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From: Somewhere out there.
Hey gear experts!!!!
Jet, I was thinking about this a little more... I think your right, that the gear change will not effect the speedo because it reads the ring gear speed, not the pinion speed like the old transmissions did. However the tires are a different story and would need a re-calibration. Sorry if I confused you
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