4.3 rear end howl

[dan4x4]

In the past I have read about some of you having problems with the 4.3 rear end "groaning" or "howling" at highway speeds. Has anyone ascertained the cause of this? Is this a wide-spread problem?
Thanks.
Dan

[NoMo]

I have the 4.30 gears & had a groan/howl at speeds over 70mph. The noise wasn't due to the rear-end, though. Mine was caused by an un-balanced driveshaft.

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2000 4x4 F250 XLT SuperCab SWB- V10, Automatic, 4.30LS, Offroad Pkg, Camper Pkg, OEM Hitch, Tape/CD Player, Remote Keyless Entry, Sliding Rear Window, Privacy Tint, Aluminum rims, 265/75R16 OWL tires, Line-X bedliner
NoMo's site

[geno87]

My 99 had this problem, however it was the rear auto trans seal, where the driveshaft enters the tranny.

I actually thought that was normal, until the tranny started leaking fluid. Had the seal replaced, and suddenly the truck rode a whole lot quieter!!!



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2001 F350 SRW CC LB V10 3.73 Auto Ordered 12/22/00

[kenc]

No howl here. Aug 2000 production date.

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2001 F250 Lariat CC SWB V10 Auto 4x4 4.3LS, Shift on fly, Block heater, TT mirrors, Off-road, Reverse sensor, Hitch, Heated seats, 5.5 Fabtech, 37 BFG, 8x17 Boyd, Rancho Dual 9000, Line-x, Waag w2w bars, B&B exhaust, K&N intake, Escort SR1, Compustar Alarm, Pics.

[MNguy]

I have the same problem with my 2001 CC V10 4.30s. At 3000 miles, A the truck developed a vibration/audible rumble at about 60 plus mph. It is similar to the sound and feel of a bad U joint. Anyway, I swapped back to my stock tires and rims. No change. swapped the driveshaft 180 degrees, no change. The dealer checked my driveline angles and they were right on. Now they are telling me that it is a vibration caused by the exhaust(Y pipe). I have had it into the dealer 3 times already and no fix yet.

MNguy

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2001 F250 CC SWB, 2.5" BDS lift, Rancho 9000s, 35x12.50 BFG ATs, Centerline Apache wheels, Westin Stainless nerf bars, Stull Grill

[TB]

MNguy,
I picked up my truck from the service department on Thursday. They keep trying to tell me that it is the Y pipe as well. I'm leaning towards NoMos solution for the problem, but I can't seem to get the service department to try it. I'm not sure what to do. If I get a resolution to this problem I will post it. On another note, does anyone happen to have the rattling front brake caliper problem?

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2001 F250 V10 CC Lariat SB 4x4 Black (Ordered 7/6/00)

[MNguy]

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by TB:
MNguy,
I picked up my truck from the service department on Thursday. They keep trying to tell me that it is the Y pipe as well. I'm leaning towards NoMos solution for the problem, but I can't seem to get the service department to try it. I'm not sure what to do. If I get a resolution to this problem I will post it. On another note, does anyone happen to have the rattling front brake caliper problem?

<HR></BLOCKQUOTE>

I really suspect the driveshaft too(balance), however there is supposedly a new(try number 2) Y pipe. This one is not necked down to 1.5" like the last fix attempt. It is also supposed to have a flex pipe built in to help eliminate vibration. They said I should have one in 2 - 4 weeks.

MNguy


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2001 F250 CC SWB, 2.5" BDS lift, Rancho 9000s, 35x12.50 BFG ATs, Centerline Apache wheels, Westin Stainless nerf bars, Stull Grill