M5R2 Problems
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M5R2 Problems
Hello everyone.
I have a 1991 f150 with 79k miles on it. It has the m5r2 and its making a howling/grinding noise at idle and at higher rpms. I got the truck with 73K on it and I think I was the first to change the fluid at 75k. It was very black and had a lot of metal in it. At 78k I changed the fluid again after a long trip from Florida to Ohio. The fluid wasn't black at all but the plug was caked with metal.
I have had a few people tell me its the throw out bearing would that cause it?
Im pulling the tranny tomorrow to look at everything. My boss said if I used 90w gear oil it will take away the sound. Is this a good idea?
I am leaving to go back to FL in a week so I want to get this fixed so I wont be stranded.
Any help is much appreciated!!
I have a 1991 f150 with 79k miles on it. It has the m5r2 and its making a howling/grinding noise at idle and at higher rpms. I got the truck with 73K on it and I think I was the first to change the fluid at 75k. It was very black and had a lot of metal in it. At 78k I changed the fluid again after a long trip from Florida to Ohio. The fluid wasn't black at all but the plug was caked with metal.
I have had a few people tell me its the throw out bearing would that cause it?
Im pulling the tranny tomorrow to look at everything. My boss said if I used 90w gear oil it will take away the sound. Is this a good idea?
I am leaving to go back to FL in a week so I want to get this fixed so I wont be stranded.
Any help is much appreciated!!
Senior User
Joined: Nov 2000
Posts: 379
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From: Azle, TX
sounds like synchros among other things are eaten up in that thing. I've drained all mine b4 and it's never been black (uses auto tranny fluid). Do not use 90w gear oil, this tranny was not designed for it.
Post Fiend
Joined: Mar 2002
Posts: 19,402
Likes: 38
From: Bonita Springs FL
Possibly, but the amount of metal you are describing is not normal. There is definitely something going on and you should get it figured out. Unfortunately you are probably going to have to pull the top cover to possibly see what's going on.
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They are an alright trans if you maintain them. My friend changed his fluid every 15k in his ranger and every other time he changed it he put in an additive. Its still going lasted longer then mine lol.
I found a m5r2 in my area with 90k for 250 bux im gonna go check it out today.
I found a m5r2 in my area with 90k for 250 bux im gonna go check it out today.
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Senior User
Joined: Mar 2009
Posts: 253
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From: N.B., Canada
Many people do use a heavier gear oil in the ZF transmissions I do believe to quieten down the noise from it. I suppose the same could be done to the M5R2, just don't go much thicker. That said, they are designed to be running ATF for a reason...
I have a very light and quiet grinding noise when at idle in neutral. Haven't been able to associate it with anything yet, even after having the top cover out. I had my shift fork break on me a while ago. Bought a perfectly good M5R2 from a local ford guru for 40$ swapped the fork in. Now my syncros are going. I will just use the two transmissions to put in the best parts.
I have a very light and quiet grinding noise when at idle in neutral. Haven't been able to associate it with anything yet, even after having the top cover out. I had my shift fork break on me a while ago. Bought a perfectly good M5R2 from a local ford guru for 40$ swapped the fork in. Now my syncros are going. I will just use the two transmissions to put in the best parts.
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