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Thread: Slipping transmission???

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    Slipping transmission???

    Hi all, I just completed my first major excursion pulling our BH 3055 with our '99 F250 Diesel. I pulled up and down the Black Hills (primarily hwy 16 south of Rapid City). There were some pretty long 6-7% grades and for whatever reason my transmission temp gauge chose this trip to stop working although the EGT gauge was fine. Anyway we made it up and down the hills but on the way home I was pulling out of an overnight stay in Winona MN up a very short but very steep grade. On the way up I had the sensation that my back wheels were slipping as if they were intermittently catching some gravel and slipping. What bothered me was that it seemed a little too regular to just be catching a few patches of loose road. It very briefly did a similar thing once more before we got home. So..... my question is this: Has anyone else had an issue with a transmission starting to slip like this maybe because it has been overloaded? Does this seem plausible that a transmission can start having this type of problem and if so, is it doomed to get worse? I have always known that the 7.3 diesel was almost bullet proof but the transmission in that model was the weak link if there was one. Any information would be appreciated. By the way, the truck seems to drive normally unloaded and I had no issues pulling the BH on more level ground. Thanks, Pete
    Pete and Sharon
    Buttons (Lhasa Poo)
    2008 Bighorn 3055
    2008 Ford F250 Crew Cab Diesel

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    Senior Member timk's Avatar
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    Pete,
    If it is slipping, I wouldn't pull again till you address the issue. In my mind it sounds like your close to smoking the clutches. You could have a builder up the pressures some, but I suspect most will want to do a rebuild at this point. I would also get the fluid changed asap.
    I have had an ATS upgrade, and a DTT upgrade done to our tranny, and honestly I wouldn't recommend either. It sure dont slip but when it shifts it SHIFTS.
    TimK
    3400 rl 3500 ram

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    Senior Member DennisZ's Avatar
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    Pete
    I had a similar problem develop with my 2001 F-350 pulling a SOB fiver. it started out as a little slipping then went to slipping in reverse, then gave out all the way on our way home from our trip. I had to have the truck and trailer towed home. The tranny was totally smoked.

    During the rebuild, I had a Suncoast torque converter installed, it is the weak link in the Ford tranny. I've been having the fluid changed every 15K miles while towing. I also installed 2 hugh transmission coolers (about 80K of cooling). My tranny temps now stay around 160 to 170 while towing.

    Good Luck!

    Dennis
    2008 Holiday Rambler Endeavor 40PDQ
    Heartland Owners Club #1078
    2 Really Spoiled Little Dogs
    Dennis & Debbie Z

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    Well guys, that was not the answer I was looking for. Something more like "Come on Pete, you're making way more out of this than you should" would have been nice. But seriously, it does raise two questions. First, if it came to rebuilding the tranny, what kind of ballpark price are we talking here? But what I'm struggling with even more is what would I do with it right now? As I said, it seems to run just fine in most cases. How would they diagnose a problem that happened briefly once or twice under extreme load? I can't imagine there are any reasonably priced diagnostics that they could slap on my tranny to verify a problem right now. And I'm certainly not going to have them tear down my tranny on a hunch. It almost seems that I have to have something a little more substantial to even bring it to a repair shop. Am I missing something here? Thanks.
    Pete and Sharon
    Buttons (Lhasa Poo)
    2008 Bighorn 3055
    2008 Ford F250 Crew Cab Diesel

  5. Print this Post   #5

    Possible trans trouble

    Smell the fluid -- if burned you will know. Also look at color it should be nice clear red not dark. Both are good indicators of trouble or imagination.
    Jim & Chris
    2007 Cyclone 3795 FullThrottle
    2006 Dodge 3500 CTD Dually
    '97 FLHTCUI
    '88 FXRS
    '79 FLH SHOVEL

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    Thanks Jim. I will be having the tranny fluid changed out in the next week or two and I will ask them to look closely at the fluid coming out. I also need to see what I can do to get my tranny temp gauge back on line. It picked the worst time to go south on me. Pete
    Pete and Sharon
    Buttons (Lhasa Poo)
    2008 Bighorn 3055
    2008 Ford F250 Crew Cab Diesel

  7. Print this Post   #7
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    Do as alkyspeed suggested or go to a tranny shop for a diagnostic opinion. If the fluid smells burnt, the damage is done, most reputable tranny shops will not recommend changing the fluid. If you are still not convienced..............drive it until it drops. The worst that can happen is getting stranded in the middle of nowhere or limping to a shop or home. I would not run the risk............you are best served to control the environment for necessary repairs. When these symptoms occur.............it is a sign of more problems to come. Depending on where you go, the cost could be $2k to $4k. If the truck is worth keeping, you might consider "beefing up" the tranny to help minimizing this problem again.

    Forrest

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    Senior Member timk's Avatar
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    Just pull the dipstick. Check color and smell. Next step would be to check the filter, and drain plug if yours is magnetic.

    Pete, here is something to hope for. Today we were pulling seriously hard up a big hill and our transmission sounded like it was slipping on and off. Note that I said "sounded", your deal was fresh in my mind so I was watching the tach, and it was steady. What was happening was it was an audio thing, sound was bouncing off trucks and rocks and things, and made the truck sound like it was revving up as we went by them. Its a slim chance, but thats all I got.

    In our dodge we can get rebuilt for 3k or an upgrade for 5k plus depending on what parts you put in. I'm embarrassed to tell you what I got in mine.

    good luck
    TimK
    3400 rl 3500 ram

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    Senior Member Pulltab's Avatar
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    Pete, take to the shop and have them drop the pan and change the filter, you did not mention how many miles have been put on the tranny since last service. Could be the filter is partially clogged and not providing enough fluid in a stress condition. Once then have the pan they will see any serious metal loss on the clutches, some is normal. Like these guys said if it smells burnt you most likely have a clutch problem. Sorry it is not going to cure itself but possibly if changing the filter and fluid you may get back to normal. ATS builds some really fine bullet proof trannys and coupled with a good torque converter the difference can be amazing. It's only money brother
    '07 Bighorn 2925RK, 07 Dodge Ram Big Horn 3500 6.7 Cummins Turbo Diesel, 6 spd auto, 540 watts solar, Tankless water heater, Centerpoint suspension,Trailair pin box http://www.progressiveindustries.net/ems_hw50c.htm
    Heartland Owner 1097

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    Senior Member DennisZ's Avatar
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    My rebuild with the Suncoast torque converter was $4K, the T/C was over $1300 of that price, but very well worth it. Also, BTS does build a great tranny.

    Dennis
    2008 Holiday Rambler Endeavor 40PDQ
    Heartland Owners Club #1078
    2 Really Spoiled Little Dogs
    Dennis & Debbie Z

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