High pitched squel when in gear - Ranger-Forums - The Ultimate Ford Ranger Resource


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  #1  
Old 08-03-2015
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High pitched squel when in gear

Good Day All,

I have a 2003 Ford Ranger Edge that has a high pitched squeal that only happens when in gear. If I push in the clutch it will eventually go away but as soon as I engage a gear it starts right back up. It's pretty loud and very high pitched. It's a 5 speed manual BTW. Any ideas or advice would be greatly appreciated! Thanks,

Chuck Branham
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Old 08-03-2015
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Does it do it in Neutral with clutch in or out?

When stopped and in 1st gear with clutch in does it do it?

Squealing is obviously a bearing going out, or rubbing which is a bearing going out, lol.

The input shaft of the transmission is driven by the clutch disc, the flywheel and pressure plate are connected to engine/crankshaft

So at idle the flywheel/pressure plate is spinning at 650rpm
And clutch disc/ input shaft would also be spinning at 650rpms if trans was in neutral and clutch pedal was out.

If you press the clutch pedal in and shift into 1st, the clutch disc and input shaft have to go to 0rpms, because truck is not moving, and transmission output shaft is 0rpms, and when trans is "in gear" input shaft and output shaft are connected.

Throwout bearing going bad "usually" only makes a noise when clutch pedal is in.
Pilot bearing(end of input shaft on crankshaft) could make a consistent noise.

Have you checked the fluid level in trans, if it was ever very low then you could need a rebuild.
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Old 08-04-2015
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Going to try and answer your questions. Let me know if I am not clear and thank you.

- Does it do it in Neutral with clutch in or out?
No. If it's in neutral it will never make the noise even if the clutch is in or out.

- When stopped and in 1st gear with clutch in does it do it?
No. There is no noise anytime the clutch is in or pressed. The only time there is noise is when a gear is engaged and the clutch is out.

The truck had a complete rebuild on the tranny not even 25K miles ago and even after the rebuild it still made the noise. The mechanic said something about a hydraulic pump that was a poor design causing it? Does that sound right?

I traded my dad my 88 GMC for this truck I have now and he told me that's what he thought the mechanic had said. It has a new throwout, slave chamber and something else I can't remember what it was.
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Old 08-04-2015
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Mechanic F*ed up
Hydraulic pump?

Automatic's use pressure and need pumps, not the M5OD-R1 transmission.
And nothing about the M5OD was a bad design(well shift rail plugs, were marginal, lol), there are literally millions of these transmissions still running fine today, they were in fact a very good design.


So the noise only happens when output shaft is moving, so when truck is moving.
I don't think a u-joint would "squeal", "clunk" is the usually description for u-joint.
And rear axle problem would sound far enough away to not be described as transmission noise.

And coasting in Neutral it still makes the noise?

I would think you would be better off to get a used M5OD-R1 from another 2WD 3.0l Ranger.

Parts list for M5OD, no "pump": http://www.therangerstation.com/tech...KoygoMazda.pdf
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Old 08-05-2015
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Coasting in neutral does not make any noise. It's just anytime I have a gear engaged (running down the road) it squeals. When I push in the clutch you hear the sound start to disappear and then totally goes away until I put it back in gear. If I am setting still in neutral there is no sound at all. That diagram only says it goes to 1998. Does it still apply for my 2003?
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Old 08-05-2015
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Yes, no real changes in M5OD-R1 from 1988 to 2011, they did have the M5OD-R1HD but all that was done was they added an extra bolt hole in the bell housing for the 4.0l SOHC engines, 2001 to 2011.

It reads like one of the thrush washers/bearings in the trans is the issue, when you have a load/torque on the trans the shafts slide one way that's called thrust, it only happens in gear and it might be worse when accelerating or decelerating because the shafts will be pushing against the back or the front of the thrust washers/bearings.
In Neutral thrust is minimal.
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Old 08-11-2015
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Ok so got it figured out and feel stupid as can be. The reason for the squeal was the speed put on the serpentine belt over the water pump. The water pump bearings were going out... Had nothing to do with the tranny at all. Thank you so much for trying to help me but it was weird I would never get the squeal unless I was in gear lol oh well.

Thanks again!
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Old 08-11-2015
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Thanks for the update and fix :)
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