Help calm my fears....Have a new set of us/strange torq-line 4.10 gears. Less than 25 miles on them. Didn't hear any noise on the way home.. Later same day I went for a short ride and can hear a slight noise of the gears turning when I let my foot off the accelerator and coast a bit. Then when I press the pedal to accelerate again I can hear the same noise barely. From a stop to cruising I can't hear a thing. Is this normal and will it go away? Capt.

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Capt. America..,
1998 F-150 XLTSC...2WD.. . 4.10LS rear...auto E40D... 5.4L...Flairside... Ground effects... Billet Pedals... Billet Grill... Billet Brake lite... Oval Mirror... Bed rails... Bug Deflector... Wood Grain Kit...Fog lites... TPS...Velocity tube... K&N... ss Ford tag.,.Tinted Windows... overhead/floor consoles... Mood lights...Blue bulbs... Alarm...Radar...Dashmat... Fire/Ice rear window tint ...conspicuity reflectors... cd changer...mobil 1... Painted rear Drums... Helwing Sway Bar... Dual Exhaust... Halogen Back-up bulbs... clear corner lens...
Tail lens covers... Leather...Floor Mats... Seat covers...Tow Pkge...
Side window Louvers... Painted Brake calipers... Custom Captian America Paint Job...TRIPLE LED brake lights...Rain guards... Painted throttle body cover...sliding rear window...Superchip...Custom Gas cap holder...2" leveling shackels...Fox tail key chain...Clear turn signal bulbs..

 

Not normal. I would have them checked out.

 

HI!... CAPT : Sounds like the mechanic who installed your gears did'nt get your "BACKLASH" set at the right measurment. When I had my 4.10 gears installed I never had any noise and still don't. I would go back and talk to your installer.

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NEAL [ the horsepower freak ] NEWMAN
'99' F-150 XLT SPORT, oxford white, reg cab shortbox stepside,5.4, auto, 4.10L.S, captain's chairs, bedliner, GTS carbon fiber headlight covers, **** CEPECK clear halogen driving lights, GTS slotted tailight covers (painted oxford white), FORD locking lug nuts, tinted windows,true duel exhaust with 2.5 inch mandrel bent pipes and FLOWMASTER 3 chamber mufflers with 3' tailpipes exiting before the rear wheel like the LIGHTNING, HELLWIG rear stabalizer bar, AUTOMETER guage pod and tranny temp guage, custom fabricated air intake trac and huge K/N filter, TPS mod, BELLTECH 2-inch rear drop, custom programed SUPERCHIP.

FUTURE MODS : JBA headers, ASP power pulleys, twin electric fans, traction bars, BAUMANN ENGINEERING shift kit, POWERAID spacer, AUTO METER oil preasure/ engine temp PHANTOM GUAGES and a KENNE BELL BLOWZILLA supercharger.
ESTIMATED H.P TO DATE : 310H.P / 405ft/lbs of torque.

OTHER TOYS : "83" PRO STREET FORD RANGER : 351-w stroked to 408c.i 625H.P (natural), 875H.P with 250H.P "BIG SHOT" N.O.S kit, tubbed (crome moly tubing), 12 point chrome moly roll cage, 4-link with coil overs, MUSTANG II front suspension, c-4 tranny (race prepped), 4000rpm stall converter(8 INCH), 3" chrome moly driveshaft,AUTOMETER guages, 15.50 MICKEY THOMPSON rear tires, 4" M/T front tires, CENTERLINE CON-VO PRO rims, fiberglass hood - bumper - prostock hood scoop, wishbone trac-link, two chrome moly driveshaft loops, 16 gallon RCI fuel cell,etc

 

Sounds like a missed pattern with the ring and pinon. Due something fast or you with be living with that noise untill a failure

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99 F150 xlt s/c orp auto, 2,000 5.4 replacement soft tonneau, rubber maid bed mat,mud from the dirt bike(YZ250)

 

The "Guys" are really calming your fears now aren't they Captain!

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97 F-150 SC Lariat, Styleside, White over Gold, 4.6L (Windsor), Automatic, 3.55 rear end, electronic 4X4, w/ every option of Lariat and ORP packages except the 17" wheels (I even got the OR decals now!) MOD's so far: K&N air box mod, Gibson Super Truck, clear Bugflector II, Leer TSC 600 hard cover, Bridgestone Dueler OWL ATP 265/75 R-16's, TrailMaster Invader N7 shocks, Smittybilt step bars, Ford moulded mud guards, "White-white" head lamps, Cloud Rider Design's SS Grill and bumper opening, Bosch Platinum + 4's, Hayden 30K+ Tranny Cooler,Class III Reece load distributing hitch system, full wiring including trailer battery charging system, Escort Sensor II Brake controller, Superchip

 

Took the truck back to installer. He test drove the truck with me and no noise at all shifting into forward or reverse. No noise at all during acceleration. Very slight noise hardly audible during coast. He made comment about checking torque on pinion nut. Left truck with them. Returned and he said torque was off about 5 lbs. Drove home and it's practically gone..However it still is audible if widows are up radio off no ac running. Very very light. {during coast only} Called him back and he said take it to another shop of my choice and let them test drive it...The next shop told me it was fine.They also heard the same very very light hardly audible noise on coast only...Asked what to do and he said " drive it for a week if it's not gone then change to a different fluid. I'm using amisol 75/140 now...put 30 miles on it today and have to admit it's getting harder to detect! My truck was lowered 2" in rear on same day as install.... What do you think????

 

Sounds like they may have eliminated some of the back-lash. Perhaps it will "wear in" and get quieter. However, with that slippery synthetic fluid in there, I don't think it will wear-in in just a week.
Since it is only noisy when coasting, it sure sounds like a gear back-lash problem to me (no PUN intended ) You could also drive in reverse and then coast (continuing in reverse) to see what it sounds like.

 

Capt. My gears have been nosiy since day one. I have approx 18k and I still hear it especially when you coast. I brought it to the dealer a 7k and was told they coundn't recreate the noise. I have removed the rear cover to change the fluid at 16k and no chips were found and the gears appear to be fine. Go figure.

Henry

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99 F-150 XL 4x4. RC Flareside 4.6 5spd, 3.55LS. gibson 3" cat-back, K&N Gen ll.Westin step bars.Ventshade window deflectors and bug deflector. rhino liner and a cool white shifter ball.

 

I would agree that the rear end is not set up properly take it back.

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*2000 blk xlt f150
*5.4 4x4 3.55 ls
*sc orp pkg
*tow pkg, 17 inch wheels
*herculiner,remote start
*flowmaster, air box mod
*bfg ko's A.R.E. cap
*sony 10 disc cd player
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****mods to come*********
LS for front diff
wms air tube
super chip

 

No noise detectable at all in rear end now. Everything looked fine on inspection I had done today! The mechanic that installed the gears put it up on the rack and ran it at 2200 rpm in forward and reverse. We could hear or feel nothing. Next he pulled the cover off and everything checked out fine. I took a good look and I'm satisfied there o.k.. Refilled with redline and fm.. drove home the long way and could't recreate any noise.. Just to clarify the original noise was very very slight on coast only and they made one adjstment of 5lbs torque on pinion nut...I'm now no longer a member of the " Not To Happy " club. The shop manager did call me numerous times at home and said he would back his work yet felt very confident that it was nothing. Capt....eeerrr!!!!