TIME BOMB!? maybe, maybe not?...
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Senior User
Joined: May 2014
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Ran the truck down the highway for 2 hours today at 73mph in high gear. Slight wine but nothing awful in fifth. Wine does go away in 4th 1:1. About midway through the trip I went through a town and had to stop at a stoplight and the truck was very hard to get back into gear. Even had to double clutch a few times. Any thoughts?
Lead Driver
Joined: Oct 2003
Posts: 8,476
Likes: 37
From: Madison, WI
Don't drink and drive.... 
That might be a clutch disengagement issue. Was it hard to get into first at a dead standstill? When you put it in first, clutch pedal all the way down, does the truck want to creep?
About midway through the trip I went through a town and had to stop at a stoplight and the truck was very hard to get back into gear. Even had to double clutch a few times. Any thoughts?
Elder User
Joined: Aug 2012
Posts: 567
Likes: 2
The syncros have some wear on them from the PO, right? An ATF is friction modified to be slick from a lubrication stand point. MTF on the other hand is designed specifically for the proper coefficient of friction to make syncros work better, and thus, shift better.
Some will swear up and down to only use an ATF in these transmissions, and that will work so long as the syncros are in good shape but it will always be a shortcut so simplify stocking/servicing by Ford. Its easier to only use ATF...
Elder User
Joined: Aug 2012
Posts: 567
Likes: 2
I remember when I first got my truck and went through changing all the fluids, the ZF5 shifted fine to me. I'm not sure if that's just due to false memory, or I just didn't know any better since it was new to me.
I poured the nastiest sludgy ATF out of that trans, it was pretty shocking to a maintenance fanatic like me.
Anyway, It never shifted right on ATF again. I tried 3 or 4 different ATF's. Conventional, synthetic, didn't matter. I even tried the spendy Amsoil Syn ATF. I liked that the changes were flushing the crud out of there, but it wouldnt shift like it did with the burnt sludgy ATF the PO had in there.
Long story short, MTF changed everything! My conclusion is the sludgy ATF was somehow gritty enough to provide good friction to make the syncros work as intended, and the new ATF was too slick/thin due to the miles and wear on the trans.
I hope this helps! Happy New Year!!
I poured the nastiest sludgy ATF out of that trans, it was pretty shocking to a maintenance fanatic like me.
Anyway, It never shifted right on ATF again. I tried 3 or 4 different ATF's. Conventional, synthetic, didn't matter. I even tried the spendy Amsoil Syn ATF. I liked that the changes were flushing the crud out of there, but it wouldnt shift like it did with the burnt sludgy ATF the PO had in there.
Long story short, MTF changed everything! My conclusion is the sludgy ATF was somehow gritty enough to provide good friction to make the syncros work as intended, and the new ATF was too slick/thin due to the miles and wear on the trans.
I hope this helps! Happy New Year!!
Thread Starter
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Senior User
Joined: May 2014
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I remember when I first got my truck and went through changing all the fluids, the ZF5 shifted fine to me. I'm not sure if that's just due to false memory, or I just didn't know any better since it was new to me.
I poured the nastiest sludgy ATF out of that trans, it was pretty shocking to a maintenance fanatic like me.
Anyway, It never shifted right on ATF again. I tried 3 or 4 different ATF's. Conventional, synthetic, didn't matter. I even tried the spendy Amsoil Syn ATF. I liked that the changes were flushing the crud out of there, but it wouldnt shift like it did with the burnt sludgy ATF the PO had in there.
Long story short, MTF changed everything! My conclusion is the sludgy ATF was somehow gritty enough to provide good friction to make the syncros work as intended, and the new ATF was too slick/thin due to the miles and wear on the trans.
I hope this helps! Happy New Year!!
I poured the nastiest sludgy ATF out of that trans, it was pretty shocking to a maintenance fanatic like me.
Anyway, It never shifted right on ATF again. I tried 3 or 4 different ATF's. Conventional, synthetic, didn't matter. I even tried the spendy Amsoil Syn ATF. I liked that the changes were flushing the crud out of there, but it wouldnt shift like it did with the burnt sludgy ATF the PO had in there.
Long story short, MTF changed everything! My conclusion is the sludgy ATF was somehow gritty enough to provide good friction to make the syncros work as intended, and the new ATF was too slick/thin due to the miles and wear on the trans.
I hope this helps! Happy New Year!!
Tuned
Joined: Dec 2012
Posts: 372
Likes: 5
From: 85716
Is this the stuff that you guys bought?
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Senior User
Joined: May 2014
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Flushed the tranny today and put valvoline MTF in. I'm very pleased, it shifted smoother and less noise. I definitely think it's better with a trans with higher miles. Thanks for the advice!
Lead Driver
Joined: Aug 2006
Posts: 5,670
Likes: 13
From: Sand Lake, MI
How thick was that putting it in? According to Valvoline's spec for it it's 75W-90 weight, if so that'd be to heavy for a M5R2 that calls for Mercon automatic transmission fluid.
I wouldn't run it straight I'd mix it with mercon at least 50/50 25/75 in favor or mercon would be better.
Adjust as necessary as so not hard to shift when cold outside.
End result is the same thing as mixing in just a little rear end lube, give it more body more "EP" protection but yet allow it to get where its needed and right off the bat especially when cold.
I wouldn't run it straight I'd mix it with mercon at least 50/50 25/75 in favor or mercon would be better.
Adjust as necessary as so not hard to shift when cold outside.
End result is the same thing as mixing in just a little rear end lube, give it more body more "EP" protection but yet allow it to get where its needed and right off the bat especially when cold.
Thread Starter
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Senior User
Joined: May 2014
Posts: 147
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How thick was that putting it in? According to Valvoline's spec for it it's 75W-90 weight, if so that'd be to heavy for a M5R2 that calls for Mercon automatic transmission fluid.
I wouldn't run it straight I'd mix it with mercon at least 50/50 25/75 in favor or mercon would be better.
Adjust as necessary as so not hard to shift when cold outside.
End result is the same thing as mixing in just a little rear end lube, give it more body more "EP" protection but yet allow it to get where its needed and right off the bat especially when cold.
I wouldn't run it straight I'd mix it with mercon at least 50/50 25/75 in favor or mercon would be better.
Adjust as necessary as so not hard to shift when cold outside.
End result is the same thing as mixing in just a little rear end lube, give it more body more "EP" protection but yet allow it to get where its needed and right off the bat especially when cold.
Tuned
Joined: Dec 2012
Posts: 372
Likes: 5
From: 85716
Valvoline MTF vs Valvoline 75w90 Gear Oil
Code:
MTF 75w90 Gear Oil Vis @ 100°C (cSt) 14.5 15.6 Vis @ 40°C (cSt) 73 100 Viscosity Index 210 150 Spec Gravity @ 60°F 0.862 0.865 Density (lbs/gal) 7.22 7.22 Flash COC (°C) 220 231 Pour Point (°C) -42 -48 Phosphorus, wt.% 0.14 0.21 Sulfur, wt.% 0.39 2.3
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Senior User
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I don't mean to start anything, but I was curious so I pulled the Spec Sheet...
Valvoline MTF vs Valvoline 75w90 Gear Oil
Valvoline MTF vs Valvoline 75w90 Gear Oil
Code:
MTF 75w90 Gear Oil Vis @ 100°C (cSt) 14.5 15.6 Vis @ 40°C (cSt) 73 100 Viscosity Index 210 150 Spec Gravity @ 60°F 0.862 0.865 Density (lbs/gal) 7.22 7.22 Flash COC (°C) 220 231 Pour Point (°C) -42 -48 Phosphorus, wt.% 0.14 0.21 Sulfur, wt.% 0.39 2.3