M5R2 growl
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Freshman User
Joined: Aug 2009
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From: Central OR
M5R2 growl
Some time ago the input shaft snapped on my M5R2. I have worked on a few transmission before and been successful, so I bought the rebuild video produced by Southwest Gear and rebuilt this one. I changed the input shaft, all the bearings and 5th gear. I did not change the countershaft or cluster gear. The teeth all looked ok with no apparent flat spots on the flank surfaces, no chipped teeth.
The shafts turned easily by hand, and all the shifting worked as expected with the transmission on the bench. With the transmission in the vehicle, there is a growl coming from the transmission in all gears. It may be from the front of the transmission, since disengaging the clutch stops the noise. I seem to recall a little difference between the procedure SW Gear recommended for setting the shims for preload, and the Ford manual. It has been awhile since I did the work, so I can't remember exactly what I did to resolve it. I had some engine work to do after the transmission, so it has been about a year since I did the work.
Any ideas of what might be going on?
Thanks,
CR
The shafts turned easily by hand, and all the shifting worked as expected with the transmission on the bench. With the transmission in the vehicle, there is a growl coming from the transmission in all gears. It may be from the front of the transmission, since disengaging the clutch stops the noise. I seem to recall a little difference between the procedure SW Gear recommended for setting the shims for preload, and the Ford manual. It has been awhile since I did the work, so I can't remember exactly what I did to resolve it. I had some engine work to do after the transmission, so it has been about a year since I did the work.
Any ideas of what might be going on?
Thanks,
CR
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Freshman User
Joined: Aug 2009
Posts: 39
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From: Central OR
Thanks for your quick reply. There could have been some case damage, but nothing was obvious to me. The shaft break was clean without any wreckage. When installing a new clutch about a year prior to the failure, I noticed that the input shaft bearing seemed a little loose. I elected to not do anything about it then (my mistake), and it was apparent from the shaft fracture surface that it was a fatigue failure. When it failed, we were just driving on the freeway at about 65 MPH.
The clutch plate, pressure plate and throwout bearing are new. The growl goes away when the clutch pedal is down, which is the loaded condition for that bearing. Doesn't this point to something in the transmission?
Best,
CR
The clutch plate, pressure plate and throwout bearing are new. The growl goes away when the clutch pedal is down, which is the loaded condition for that bearing. Doesn't this point to something in the transmission?
Best,
CR
Fleet Mechanic
Joined: Apr 2012
Posts: 1,275
Likes: 134
Sounds like that old loose input bearing may have caused uneven wear on the input and cluster gear, with a new bearing and gear, it very well could cause some noise, might drive it awhile, drain and change the oil, and look at the magnet for fine metal residue.
Thread Starter
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Freshman User
Joined: Aug 2009
Posts: 39
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From: Central OR
This is a great suggestion F5. It seems to be a little quieter now that I've driven it around town for a couple days. It may be that the new gear and old cluster need to find a happy place.
Thanks,
CR
Thanks,
CR
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