5r110 reverse issue

08_6.4stroker · Dec 4, 2016

Hello all, So recently my brother in laws truck has been slow to engage into reverse. He needs to rev it up a bit to get it to move. There are no codes,we have changed the reverse,direct, and line pressure solenoids with no change. We have read pump pressure at an idle.
P/N 95psi
R 80psi
D 100psi
3 110psi
2 110psi
1 110psi
Transmission is a used one he picked up with 45000miles has been running it for a year without an issue until now. Truck is a 2009 f250 running H & S HD300.
Any help would be appreciated.

Lipka101 · Dec 4, 2016

What should pressures be. I'm not sure on the 5r110 but reverse is usually the highest pressure. Sounds like there is a leak bleeding off pressure in reverse

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Bustedknuckles · Dec 4, 2016

Get a new manual valve from sonnax. PN 36940-22

Lipka101 · Dec 4, 2016

Bustedknuckles said:
Get a new manual valve from sonnax. PN 36940-22

Thinking its worn?

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Bustedknuckles · Dec 4, 2016

Yessir!

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Bustedknuckles · Dec 4, 2016

08_6.4stroker said:
Hello all, So recently my brother in laws truck has been slow to engage into reverse. He needs to rev it up a bit to get it to move. There are no codes,we have changed the reverse,direct, and line pressure solenoids with no change. We have read pump pressure at an idle.
P/N 95psi
R 80psi
D 100psi
3 110psi
2 110psi
1 110psi
Transmission is a used one he picked up with 45000miles has been running it for a year without an issue until now. Truck is a 2009 f250 running H & S HD300.
Any help would be appreciated.

Sorry i ment to quote you and quoted the guy asking a question. My bad. Lol

08_6.4stroker · Dec 4, 2016

Bustedknuckles said:
Get a new manual valve from sonnax. PN 36940-22

We changed the whole valve body from another trans that was working fine and it didn't make a difference. Is there a possibility the low/reverse piston is leaking?

Mark Kovalsky · Dec 4, 2016

There is more than a possibility, it's likely that it is leaking.

08_6.4stroker · Dec 4, 2016

Mark Kovalsky said:
There is more than a possibility, it's likely that it is leaking.

Ok thank you for your input. Does the line pressure in the other gears seem high for idle?

Mark Kovalsky · Dec 5, 2016

Yes it does.

5R110 Pressure Chart:
Line Pressure - Idle
P,N - 50 psi
R - 100 psi
D - 70 psi
3 - 80 psi
2 - 80 psi
1 - 80 psi

After studying this, I think the leak is probably in the low/reverse clutch. That would cause low pressure in P,R, and N, with a slight loss in D. That's what I see here. I don't know why the others are high.

Luke@MillerPerformance · Dec 5, 2016

08_6.4stroker said:
We changed the whole valve body from another trans that was working fine and it didn't make a difference. Is there a possibility the low/reverse piston is leaking?

Or the Directs are smoked.

08_6.4stroker · Dec 5, 2016

Luke@MillerPerformance said:
Or the Directs are smoked.

There was no clutch material in the pan and the fluid looked new. And it drives fine just the reverse issue. Could be the clutches tho?

Luke@MillerPerformance · Dec 6, 2016

08_6.4stroker said:
There was no clutch material in the pan and the fluid looked new. And it drives fine just the reverse issue. Could be the clutches tho?

Half the ones I take apart have almost no clutch material in the pan and the fluid is still decent. My guess is that the clutches wear so slowly that the junk makes it to the filters and everywhere else in the trans.

Mark Kovalsky · Dec 7, 2016

08_6.4stroker said:
There was no clutch material in the pan and the fluid looked new. And it drives fine just the reverse issue. Could be the clutches tho?

Yes it could. It might be a worn out seal in the clutch.

08_6.4stroker · Dec 18, 2016

So to update this thread. Turns out the reverse piston had a chunk of the seal missing causing a leak. And the direct clutches had also slipped a bit.

Bustedknuckles · Dec 22, 2016

08_6.4stroker said:
So to update this thread. Turns out the reverse piston had a chunk of the seal missing causing a leak. And the direct clutches had also slipped a bit.