Screeching noise- tranny?
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Joined: Jul 2003
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Screeching noise- tranny?
Longtime lurker, first time poster.
I've looked for similar threads here and can't find one just like this.
vehicle: 2001 F250 Lariat crew 4x4 SB w/ Powerstroke, auto trans, dual alternators, camper package, stock wheels, tires, ride height, engine-- recent new brakes and shocks, just turned over 90k trouble free miles.
On long, steep uphill grades at about 2300-2600 rpm at 40-50 mph, or accelerating hard under similar conditions on level ground (at 50-60mph), I hear a screeching noise that sounds real similar to a slipping belt, but the belt is 20,000 miles old and in like-new condition. It happens with the AC on or off and would appear to be dependent on the engine speed as much as anything. If I back off the go pedal just a bit it stops.
Anybody got an idea? Tranny? Alternator bearing? TURBO? it only happens under load so I can't find it in the driveway with someone revving the engine--
Any help would be greatly appreciated.
I've looked for similar threads here and can't find one just like this.
vehicle: 2001 F250 Lariat crew 4x4 SB w/ Powerstroke, auto trans, dual alternators, camper package, stock wheels, tires, ride height, engine-- recent new brakes and shocks, just turned over 90k trouble free miles.
On long, steep uphill grades at about 2300-2600 rpm at 40-50 mph, or accelerating hard under similar conditions on level ground (at 50-60mph), I hear a screeching noise that sounds real similar to a slipping belt, but the belt is 20,000 miles old and in like-new condition. It happens with the AC on or off and would appear to be dependent on the engine speed as much as anything. If I back off the go pedal just a bit it stops.
Anybody got an idea? Tranny? Alternator bearing? TURBO? it only happens under load so I can't find it in the driveway with someone revving the engine--
Any help would be greatly appreciated.
New User
Joined: Jul 2003
Posts: 3
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From: Swea City, IA
Screeching noise- tranny?
Check your driveshaft ujoints. I just did them in my F150 last week. They make the same sound under the same conditions you're describing. Mine were not loose so wiggling the driveshaft didn't tell me anything, I had to pull it to find out that the grease had dried up in them.
Thread Starter
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New User
Joined: Jul 2003
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Screeching noise- tranny?
Thanks-- I tried that and they're OK. The noise comes from the front of the rig.
3.73 axle if anyone thinks that matters. I'm beginning to think it's just turbo noise described in other threads, but that's some ugly turbo noise...
3.73 axle if anyone thinks that matters. I'm beginning to think it's just turbo noise described in other threads, but that's some ugly turbo noise...
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