When going down the highway and in 4th gear, all is quiet. But as soon as I shift to 5th you can hear a low screechy whine after letting out the clutch. What could this be?

'89 F-150 300-6 5sp. 4x4 3.08 133,000 mi.

 

Same thing happens in my truck. same year, same tranny. also all shifts are smooth except for 4th to OD. then there is a jolt when the cluth is released. why?

 

I just got done replacing my M5R2 (M5OD) with a reman.

There was a design problem with this tranny from the factory. Some time ago Ford came out with an upgrade for 5th. The part is still available but runs $650. There was going to be no savings if I had this part built into my tranny, which had 165,000 on it, so I just used mine as a core.

If you do decide at some point to fix the problem, it seems the best way to deal with it is to trade an un-upgraded M5 core for a rebuilt, Upgraded M5. Mine ran $1325 w/ 12/12 warranty. I was looking at a reman on Ebay for $650 but couldn't understand how the guy could sell em for that when the part alone from Ford costs that. Although I suppose that he could be starting with a core that had been upgraded in the past.

When I drained the fluid out of my tranny to begin removal, the fluid was completely flecked with pulverized aluminum and the ATF was only 3 mos. old.

 

well my 5th gear synchronizer has gone out so when i stick it up in 5th gear and hit the gas it pops out and mine was making that funny noise before it went out so check it out man. mine is m50d too has 198,000 on it

 

[updated:LAST EDITED ON 30-Jan-02 AT 00:55 AM (EST)]I was wondering about the synchronizer.
I also wonder why it din't start this whine untill after a clutch job back in Sept. And has gotten a little louder as time goes on.

Thanks to all Ford Men

 

If my OD went out, I'd be inclined to just run it as a 4 speed, so long as the damage dosen't spread. But then you would want OD if you have anything more than about a 3.08 rear end.

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