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Old 08-10-2022, 04:42 PM   #1
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Loss of climbing power

Hello everyone, it's been awhile. I just returned from a 2000 mile trip in my 2002 Winnie 430v class C. E450 Super Duty 6.8 V10, 4100R tranny with synthetic fluid and oversized trans cooler. Started out pulling Sam's Gap{ 8 plus miles at 7%} with less than dazzling performance. Found the I-81- I77 through VA and WVA and on to Lake Ontario, challenging towing 2006 CRV. As trip progressed across NY 20 the up and down was disappointing. Return down I-81 was really struggling. Last 400ft of 18% up my driveway almost completely stalled and then puked out trans fluid from front seal. I have taken this vehicle in same config through the Rockies multiple times. Since return I have put on a K&N open air filter, new fuel filter, new MAF. Fluid is still pink. I have installed OBDMX+ and Forscan to analyze temps etc. Afterwards still poor performance. Any thoughts? Thanks PS Did need new intank pump about 4 or 5 years ago.
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Old 08-10-2022, 04:52 PM   #2
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Where is Sam's Gap? Know of Fancy Gap. Same incline and length on I-77. Destroyed a 2000 Ford Ranger on that climb several years back. Ford had used water pump impellers that rust away to nothing.
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Old 08-10-2022, 06:21 PM   #3
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Sam's Gap is I-26 between NC and Tenn. A really long pull of two sections. I forgot to state the mileage of the vehicle 59000.
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Old 08-10-2022, 06:49 PM   #4
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Quote:
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Last 400ft of 18% up my driveway almost completely stalled and then puked out trans fluid from front seal.
This would be my big concern. You should never lose tranny fluid from the front seal, unless of course the seal is bad. I'd be concerned that your lock up torque converter is malfunctioning. But, I'm not a tranny guy.
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Old 08-10-2022, 06:55 PM   #5
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I have only ever seen one transmission overheat, over pressurize, and finally puke out from the pan gasket. My brother's Blazer, pulling a horse trailer westbound over Sideling Hill on the PATPK.
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Old 08-10-2022, 08:39 PM   #6
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This would be my big concern. You should never lose tranny fluid from the front seal, unless of course the seal is bad. I'd be concerned that your lock up torque converter is malfunctioning. But, I'm not a tranny guy.
I am going to school myself with the Forscan PIDS and attempt to get a better handle on what is happening. There are several torque PIDs to observe. In fact I did put Torque foot pounds on screen. Maybe I should also look at the misfire and coil values as well. Understanding what base values should be seen is going to take me on another "Adventures in RV Land" moment.
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Old 08-10-2022, 09:01 PM   #7
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Originally Posted by sixkilo View Post
I am going to school myself with the Forscan PIDS and attempt to get a better handle on what is happening. There are several torque PIDs to observe. In fact I did put Torque foot pounds on screen. Maybe I should also look at the misfire and coil values as well. Understanding what base values should be seen is going to take me on another "Adventures in RV Land" moment.
I HOPE that You down shifted when pulling those grades.. The key on long steep [6% or steeper] pulls is to shift down one additional gear in order to not over stress the drivetrain..{ And yes you will be traveling in the right hand "climbing lane" traveling much slower than the "Go Fast" rigs.
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Old 08-11-2022, 08:02 AM   #8
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Yes I tried everything. I also found a thread where a person explains in minute details the workings of the 4100R trans. The gist of his findings are that Pedal Position (Fords idea) instead of throttle position( most everyone else) does not lend itself to climbing or towing. It creates high temps in its failure to downshift appropriately,thus all of us have been unknowingly putting the transmission into stress. I will find the link and post. Also I drove tanks in mountainous terrain in Vietnam and am somewhat versed in proper treatment of ones equipment. That said, I feel a bit aggravated at Fords choice in design of the four speed. Ignorance can be cured, inherent faults not as easily dealt with.
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Old 08-11-2022, 08:47 AM   #9
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My 2000 30 ft class C pulled Fancy Gap at 50 MPH, towing a Jeep Renegade.

I put the pedal to the floor and pushed it a bit harder and it shifted to second gear, wound the RPMs up to near 5000, and maintained speed.
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Old 08-11-2022, 02:22 PM   #10
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This unit was doing fine till as of late. Found the thead in regard to 4100r and V10. https://www.thorforums.com/forums/f1...ing-18086.html
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Old 08-11-2022, 03:48 PM   #11
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Check the fuel pressure under load, replacement fuel pump may be failing.
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Old 08-11-2022, 06:06 PM   #12
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Red face

Thanks I will do that. I am new to the whole OBD reader thing and need to be sure I can save the Forscan data. Never too old to stop learning I suppose.
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Old 08-27-2022, 08:53 PM   #13
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Let's start from the top.
What trans fluid are you using? 4r100 has to have the correct fluid.
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Old 08-28-2022, 03:23 PM   #14
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I used Valvoline Syn Dex-Merc.
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