95 F150 4x4 Diff's ?
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From: Fort McMurray
95 F150 4x4 Diff's ?
I just purchased a 95 Ford 150 XL 4X4, 5.0L, ATC, Manual Overdrive (mazda ? really ?), rear end and door plate tell me 3.55 limited slip rear, Ford 8.8. Truck's good and straight, engines clean, two small fluid weeps. One @ LH output seal rear diff, One @ tranny output seal to driveshaft.
That's not the problem though, I get a low pitched sound like binding/metal rubbing when I turn sharply to the right on pavement from the LH side of the truck. This sound is definitely from the rear of the vehicle, LH side. I'm wondering if it isn't in the diff itself (ie: the leak on the output), but it sounds like it comes from the tire.
I figure I should be hearing a bit of tire skid from a limited slip, not clearance problems somewhere.
At 125 km/h, the rev is at 2600-2700, would bigger tires help this gas sucking 5.0 ? Or at least get me more mileage per mouthful ?
Also, what front diff is in this truck ? Or where can I find the tag on the truck ?
Thanks for any help, much appreciated.
PAT
That's not the problem though, I get a low pitched sound like binding/metal rubbing when I turn sharply to the right on pavement from the LH side of the truck. This sound is definitely from the rear of the vehicle, LH side. I'm wondering if it isn't in the diff itself (ie: the leak on the output), but it sounds like it comes from the tire.
I figure I should be hearing a bit of tire skid from a limited slip, not clearance problems somewhere.
At 125 km/h, the rev is at 2600-2700, would bigger tires help this gas sucking 5.0 ? Or at least get me more mileage per mouthful ?
Also, what front diff is in this truck ? Or where can I find the tag on the truck ?
Thanks for any help, much appreciated.
PAT
Last edited by Brymstone; Jul 15, 2003 at 04:00 PM.
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Joined: Feb 2000
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95 F150 4x4 Diff's ?
Usually if you hear that type of noise when turning, it is an indication of front wheel bearing issues. Since it is a new truck I would recommend servicing the hubs and bearings and check the front axle ujoints. You should also, with the wheel up be able to see if the hubs are "locked in", by spinning the wheel and watching the axle shaft.
If your tires are stock(235 75 15) you could probably go with a 31" and if you do a lot of hiqhway driving a 32" without too much harm(maybe some rubbing at lock to lock)
Your front diff should be a Dana 44 TTB and the gear ration will be the same as the year but with no L/S.
If your tires are stock(235 75 15) you could probably go with a 31" and if you do a lot of hiqhway driving a 32" without too much harm(maybe some rubbing at lock to lock)
Your front diff should be a Dana 44 TTB and the gear ration will be the same as the year but with no L/S.
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Joined: Nov 2001
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From: Topsfield, MA
95 F150 4x4 Diff's ?
According to my formula for RPMs, (125 KM/H is 77.5mph right?) that would put you at 2500ish rpm at 77.5 mph with a 3.55 gear and 235/75/15 tires. Unless the gears have been changed and are not what the diff tag says. You shouldn't hear anything from the Limited Slip. Do you think you could sit in the back of the truck and listen more closely while someone drives to see if you can pin point where the sound is coming from? Keep safety in mind please.
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From: Fort McMurray
95 F150 4x4 Diff's ?
Mustang - The revs sound right, but I'm concerned with the gas consumption at that number. I drive about 1000 km a week, and gas in Fort McMurray is anything but cheap. The noise is definitely in the rear, it sounds like a rub/grind somewhere during tight radius turns (turning at stop lights, parking lots, etc.) Kind of feels like a shudder. It feels a little inconsistent, I wonder if it isn't during a specific point in the axle's revolution ?
Could you also post that formula, so I could use it for tire selection ?
Thanks for the ideas.
Could you also post that formula, so I could use it for tire selection ?
Thanks for the ideas.
Post Fiend
Joined: Nov 2001
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From: Topsfield, MA
95 F150 4x4 Diff's ?
Do you think it could be the clutches in the Limited slip binding? Maybe you should change the rear axle fluid and pour in some of the additive (called friction modifier).
Formula is: MPH X GEAR RATIO X 336 / TIRE SIZE * OD RATIO
Tires are usually a little under their rating, like my tires are 32/11.5/15s and are really 31.8" in diameter. Also, the mazda 5 speed has an overdrive ratio of .80. Are you going to install larger tires? If so, don't touch the gear ratio. If you plan on keeping the same size tires, you could swap from a 3.55 to a 3.08, but the cost to do that is expensive (atleast $450 for parts alone). I wonder if you actually have a 3.55 gear in there. Put a mark on the top of your rear driveshaft and jack up the rear tires so they are off the ground. Rotate the tire exactly 1 revolution and count how many times that chalk mark goes around. Does it go around 3 and 1/2 times? That will tell you if it's actually a 3.55 gear in there. You could also count the gear teeth but, this way is easier.
Formula is: MPH X GEAR RATIO X 336 / TIRE SIZE * OD RATIO
Tires are usually a little under their rating, like my tires are 32/11.5/15s and are really 31.8" in diameter. Also, the mazda 5 speed has an overdrive ratio of .80. Are you going to install larger tires? If so, don't touch the gear ratio. If you plan on keeping the same size tires, you could swap from a 3.55 to a 3.08, but the cost to do that is expensive (atleast $450 for parts alone). I wonder if you actually have a 3.55 gear in there. Put a mark on the top of your rear driveshaft and jack up the rear tires so they are off the ground. Rotate the tire exactly 1 revolution and count how many times that chalk mark goes around. Does it go around 3 and 1/2 times? That will tell you if it's actually a 3.55 gear in there. You could also count the gear teeth but, this way is easier.
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From: Fort McMurray
95 F150 4x4 Diff's ?
Stang - Noticed last night that the strange noises occur only under power, not coasting in tight radius turns.
If I use the same tires front and back can I just swap up to bigger tires without worrying about synchronizing with the front diff gears ? I know I need to change some stuff in the computer so I get the right speed and mileage and all that.
Thanks for the help
If I use the same tires front and back can I just swap up to bigger tires without worrying about synchronizing with the front diff gears ? I know I need to change some stuff in the computer so I get the right speed and mileage and all that.
Thanks for the help
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Joined: Jul 2002
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From: Vancouver WA
95 F150 4x4 Diff's ?
As long as the tires are the same front and back, your fine. It's very easy to re-calibrate the speedo.
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From: Fort McMurray
95 F150 4x4 Diff's ?
The tires I have now are 235/75R15 Hankooks.
I would probably go with 31's just to take advantage of extra speed for all my revs. I do a lot of highway driving so road noise and handling are more important than tons of torque and stump tearing power.
Would I need to lift any to fit those underneath ? Only 2 extra inches in height I think.
I would probably go with 31's just to take advantage of extra speed for all my revs. I do a lot of highway driving so road noise and handling are more important than tons of torque and stump tearing power.
Would I need to lift any to fit those underneath ? Only 2 extra inches in height I think.
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