tow/haul mode working?
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From: Stephensville WI
Not doubting what you say at all Bill, just that the diesel engines don't slow the truck as well as the gas engines when downshifting.....but, this is one of the key point that makes a diesel engine more efficient than the gas engine (no vacuum to slow the piston on the intake stroke) so I guess it's all in how you look at things.
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The light shows on the dash and the transmission shifts down with brake application - it just doesn't seem to hold back enough according to the stories I've heard from others - the trailer is heavy (12 rolls of hay on a 28' gooseneck flatbed) and the hill is steep - I'd be willing to resort to 4L if there weren't so many warnings of drivetrain damage on dry pavement -
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From: Birch Bay WA.
Originally Posted by BPofMD
I just made a X-country tour this summer with my PSD/30' 5th wheel and never once wished that I had installed an expensive "jake brake" ! The tow/haul feature in the PSD is great. I came down some mighty steep mountain passes too...I was duely impressed by the feature....In fact, it slowed the rig down so much on some passes that I had to hit the go pedal more than once!
Ken
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Am I to assume that you're implying that I'm the reason the truck isn't holding back? - As I've stated before when I take my foot off the "go pedal" the truck does indeed go faster and faster and faster until I have to apply the brakes because the engine is not holding back - I know how to drive the truck, I just want to know if it is doing all it is supposed to -
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From: Eastern CT.
My 06' F-350 6.0 TS trans in Tow/Haul seems to work great,,pulling my skidsteer yesterday,going down a good size hill,,touch the brakes,,truck downshifts,,prob doing 50 downhill,,rpm almost 3,000,,at this speed seems to be just helping,,if I had to hit the brakes hard,(I did'nt), the tranns would shift down,at least 2 more times,,slowing the truck and load greatly,,(was amazed as it did this one time),I was like WOOOO,,sweet.
Towing my sister's TT into a camp site for her,,driveway was a down slope,,was amazed at how well it held back,,think the speed limit in the driveway was like 8 mph,,downhill never had to touch the brakes untill the gate came up, Ford did this one right !
Towing my sister's TT into a camp site for her,,driveway was a down slope,,was amazed at how well it held back,,think the speed limit in the driveway was like 8 mph,,downhill never had to touch the brakes untill the gate came up, Ford did this one right !
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From: Plano TX and Brentwood TN
Originally Posted by barnestormer
Am I to assume that you're implying that I'm the reason the truck isn't holding back? - As I've stated before when I take my foot off the "go pedal" the truck does indeed go faster and faster and faster until I have to apply the brakes because the engine is not holding back - I know how to drive the truck, I just want to know if it is doing all it is supposed to -
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Okay, I guess we've determined that the tow/haul mode is not working - I have applied the brake slightly and the trans has shifted down - harder braking produces further downshifting - once the brake is released the engine RPMs climb and the speed increases which makes it necessary to brake - the transmission has not shifted up - So, any ideas why it is not working? What is supposed to be causing braking in addition to the downshift?
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From: Stephensville WI
Originally Posted by barnestormer
Okay, I guess we've determined that the tow/haul mode is not working - I have applied the brake slightly and the trans has shifted down - harder braking produces further downshifting - once the brake is released the engine RPMs climb and the speed increases which makes it necessary to brake - the transmission has not shifted up - So, any ideas why it is not working? What is supposed to be causing braking in addition to the downshift?
Last edited by redford; Sep 21, 2007 at 08:32 AM.
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Post Fiend
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From: Plano TX and Brentwood TN
Originally Posted by redford
It sounds liek it is working. If you take your foot off of the brake, you're telling the computer you don't want to slow down any more, so it stops the engine braking.
Last edited by tex25025; Sep 21, 2007 at 08:33 AM.
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From: Stephensville WI
I guess it depends on speed, grade and load. Now that I think about it mine has also held the gear on a downgrade. I don't remember if I had cruise control engaged at the time.
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From: Plano TX and Brentwood TN
Originally Posted by redford
I guess it depends on speed, grade and load. Now that I think about it mine has also held the gear on a downgrade. I don't remember if I had cruise control engaged at the time.
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From: Whittier, CA
Originally Posted by barnestormer
Okay, I guess we've determined that the tow/haul mode is not working - I have applied the brake slightly and the trans has shifted down - harder braking produces further downshifting - once the brake is released the engine RPMs climb and the speed increases which makes it necessary to brake - the transmission has not shifted up - So, any ideas why it is not working? What is supposed to be causing braking in addition to the downshift?
Regarding using low range, you could easily swap in some manual locking hubs so that you could unlock the hubs while in low range. One of my old trucks warned against doing that, but I did it when I wanted a lot of grunt on hard surface and it caused no apparent damage.
Sorry, out of ideas for you.
Bill
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From: Stephensville WI
Bill, question for you.
If you unlocked the front hubs but put the T-Case in 4-Low range, since the transfer case is still splitting the torque, does this mean you will only get 50% of your available torque delivered to the rear axle?
If you unlocked the front hubs but put the T-Case in 4-Low range, since the transfer case is still splitting the torque, does this mean you will only get 50% of your available torque delivered to the rear axle?