Trans Questions
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Joined: Mar 2010
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Trans Questions
Guys i have an 08 f250, DPF delete idp tunes. dashdaq monitor.
right now i mostly run extreme x or extreme street, i have my dashdaq set up to show me the TC slip. my question is how much should it slip while unlocked. i live in a rural area with a lot of hills and the truck spends a bunch of time unlocked... right now if i'm going up one of the big hills and the trucks ****s into 3rd it may slip upwards of 700 RPMs sometimes 1,000 RPM on big big hills. but locked up it will bounce a little from 1-6 RPM usually not going above 3 but it will sometimes... even if i get on the truck while locked up it will only slip up to like 16-18 RPM... my thing is why does it slip so much unlocked. when it slips like that the truck feels weak and lazy.
Also a time or two it has got stuck in 3rd gear after i got on it pretty hard.
Is any of this something i should be concerned with?
Thank you
right now i mostly run extreme x or extreme street, i have my dashdaq set up to show me the TC slip. my question is how much should it slip while unlocked. i live in a rural area with a lot of hills and the truck spends a bunch of time unlocked... right now if i'm going up one of the big hills and the trucks ****s into 3rd it may slip upwards of 700 RPMs sometimes 1,000 RPM on big big hills. but locked up it will bounce a little from 1-6 RPM usually not going above 3 but it will sometimes... even if i get on the truck while locked up it will only slip up to like 16-18 RPM... my thing is why does it slip so much unlocked. when it slips like that the truck feels weak and lazy.
Also a time or two it has got stuck in 3rd gear after i got on it pretty hard.
Is any of this something i should be concerned with?
Thank you
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Mark,
I see you are pretty smart with trans judging by your sig... is there anything special i should be doing with mine, truck has 65,000 on it. i know you should have it flushed but i'm almost afraid to, i know so many people that after they took their vehicle in and got it done the trans was all messed up.. Also on the 6.4 how do the gears work? mine will show 1,2,3,5,6. why does it show 6th and no 4th? Thank you,
Chad
I see you are pretty smart with trans judging by your sig... is there anything special i should be doing with mine, truck has 65,000 on it. i know you should have it flushed but i'm almost afraid to, i know so many people that after they took their vehicle in and got it done the trans was all messed up.. Also on the 6.4 how do the gears work? mine will show 1,2,3,5,6. why does it show 6th and no 4th? Thank you,
Chad
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,703
Likes: 2,624
From: SE Florida
You should only have it flushed if they have a heated flush machine. If it isn't heated they will think they are flushing it, but they are not. It will just mix old and new fluid.
You can drain the pan and refill. That will change about 8 -9 of the 17 total quarts. Do it at every oil change for a while and you'll be good.
The TorqShift is really a six speed, but two of the ratios are so close that one is rarely used. The unused one is fourth gear. In normal operation the trans shifts 1-2-3-5-6. When the trans is colder than 0F it shift 1-2-3-4-6. At certain speeds when it 6th gear if you floor it you will get 4th instead of 5th. From fourth it can only shift to 6th, never to 5th.
You can drain the pan and refill. That will change about 8 -9 of the 17 total quarts. Do it at every oil change for a while and you'll be good.
The TorqShift is really a six speed, but two of the ratios are so close that one is rarely used. The unused one is fourth gear. In normal operation the trans shifts 1-2-3-5-6. When the trans is colder than 0F it shift 1-2-3-4-6. At certain speeds when it 6th gear if you floor it you will get 4th instead of 5th. From fourth it can only shift to 6th, never to 5th.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,703
Likes: 2,624
From: SE Florida
Because two of the ratios are too close to each other to be useful. 1.09:1 and 1:1. And it wasn't designed as a six speed, it was designed as a two speed in front of a three speed.
The rear half of the trans is a three speed that can trace it's roots to the C6, but it has been so heavily modified that there isn't much left of the C6 design. The C6 had a couple bands, the 5R110 has all clutches, no bands.
The front half of the trans is a two speed, 1:1 and 0.71:1. Engaging the overdrive ratio on top of each of the rear transmissions' three ratios gives six distinct ratios. Not all are usable, but they are available.
We could have programmed it to shift 1-2-3-4-5-6. You would have hated it. Everybody would have brought it back to the dealer and claimed something is wrong with the trans. When it shifted 4-5 (1.09:1 to 1:1) there would have been some bumps on the shift, but the RPM wouldn't have dropped enough to be noticeable. So you'd feel a shift, but as far as the driver could tell, a shift didn't happen. Not something we wanted to do.
The rear half of the trans is a three speed that can trace it's roots to the C6, but it has been so heavily modified that there isn't much left of the C6 design. The C6 had a couple bands, the 5R110 has all clutches, no bands.
The front half of the trans is a two speed, 1:1 and 0.71:1. Engaging the overdrive ratio on top of each of the rear transmissions' three ratios gives six distinct ratios. Not all are usable, but they are available.
We could have programmed it to shift 1-2-3-4-5-6. You would have hated it. Everybody would have brought it back to the dealer and claimed something is wrong with the trans. When it shifted 4-5 (1.09:1 to 1:1) there would have been some bumps on the shift, but the RPM wouldn't have dropped enough to be noticeable. So you'd feel a shift, but as far as the driver could tell, a shift didn't happen. Not something we wanted to do.
Posting Guru
Joined: Jun 2007
Posts: 1,501
Likes: 2
From: Henderson, NV
Because two of the ratios are too close to each other to be useful. 1.09:1 and 1:1. And it wasn't designed as a six speed, it was designed as a two speed in front of a three speed.
The rear half of the trans is a three speed that can trace it's roots to the C6, but it has been so heavily modified that there isn't much left of the C6 design. The C6 had a couple bands, the 5R110 has all clutches, no bands.
The front half of the trans is a two speed, 1:1 and 0.71:1. Engaging the overdrive ratio on top of each of the rear transmissions' three ratios gives six distinct ratios. Not all are usable, but they are available.
We could have programmed it to shift 1-2-3-4-5-6. You would have hated it. Everybody would have brought it back to the dealer and claimed something is wrong with the trans. When it shifted 4-5 (1.09:1 to 1:1) there would have been some bumps on the shift, but the RPM wouldn't have dropped enough to be noticeable. So you'd feel a shift, but as far as the driver could tell, a shift didn't happen. Not something we wanted to do.
The rear half of the trans is a three speed that can trace it's roots to the C6, but it has been so heavily modified that there isn't much left of the C6 design. The C6 had a couple bands, the 5R110 has all clutches, no bands.
The front half of the trans is a two speed, 1:1 and 0.71:1. Engaging the overdrive ratio on top of each of the rear transmissions' three ratios gives six distinct ratios. Not all are usable, but they are available.
We could have programmed it to shift 1-2-3-4-5-6. You would have hated it. Everybody would have brought it back to the dealer and claimed something is wrong with the trans. When it shifted 4-5 (1.09:1 to 1:1) there would have been some bumps on the shift, but the RPM wouldn't have dropped enough to be noticeable. So you'd feel a shift, but as far as the driver could tell, a shift didn't happen. Not something we wanted to do.
Mark I have a different question, can the 5r110 command converter lock up in any gear? Can you elaborate on this as to why it can't if it can't or possiable issues if it did, I saw in another post that it would be nice there was a controller to lock it in every gear for better towing and mileage.
I'm now wondering if an override switch could be used like we use to do on the older 7.3's with the 4r's
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Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,703
Likes: 2,624
From: SE Florida
It is capable of locking in every forward gear. We didn't do it because we couldn't control it well enough to make it smooth enough for production. In the lower gears it was VERY bumpy.
I don't know if an override switch will work or not. It will lock the converter, but will it damage the solenoid? I don't know the answer to that question.
I don't know if an override switch will work or not. It will lock the converter, but will it damage the solenoid? I don't know the answer to that question.
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