Didn't mean to disappear but no internet where I was at. From reading the posts I think there is some confusion. I had troubles at 70mph with the TC locked, manually locked. After 50 miles or so of the TC manuall locked it slipped big time and I was going 70mph. The rpm's locked are about 2,400 at 70mph and when I looked down it was at 2,700 rpm's-slipping!!! I backed off right away and pulled off the road with my big load-22k. The next day I left the TC lock switch along and had no problems going another 400 miles. Going west on I40 into Flagstaf, AZ and another spot west of Flagstaff I worked the piss out of my pickup and never had a problem with slippage. The only conclusion I can come to is, LEAVE THE TC LOCK SWITCH ALONG AT HIGH SPEEDS. Use it only for extra braking but only if needed! I'm no expert here but my gut feeling is I was in the wrong messing with it at high speeds.
Having it manually locked at 70mph for a long period shouldn't effect anything. At 70 in Overdrive it will be locked on it's own anyways even if you didn't have the manual switch on there.
__________________
Brownie, Ooh-Rah! USMC Member of the NRA!
'95 F350 CC 4x2 - SRW Swap, E4OD, PHP Chip, 6637 Intake, 3" Downpipe, Lost Kitty, 140v IDM, HPX, FPR Shim (65 psi), T.C. Switch, 3.55 gears, 3" Body Lift
'88 F350 CC 4x4 - lots of dents, faded paint, old 7.3 IDI in pieces
If you manually locked the tc, it should override any/all pcm commands.
From your first post and last post my thoughts are in your manual tc
control (switch/wiring). Its also possible the issue is on the + voltage side
of the system.
Time will tell! Still sounds like an unlock and not a slip. Thats a good thing atleast!
The E4OD will flash the OD lamp and store a code for a slip.
If and only "if it was in OD (4th gear). You have not stated a flash or code.
With above statement and the amount of rpm change you are seeing i
believe its a unlock not a slip.
The E4OD will flash the OD lamp and store a code for a slip.
If and only "if it was in OD (4th gear). You have not stated a flash or code.
With above statement and the amount of rpm change you are seeing i
believe its a unlock not a slip.
Its was something electrical
Bill
From my understanding i agree with madvan.
My TC will only lock in OD or 2nd/3rd if i'm really in the go pedal. So if I was towing a load of hay at 45mph 3rd gear up a hill without the TC locked, will that cause a 290* Tranny? How could the programming get screwed up so bad that it won't lock up in 3rd unless the throttle is at 90% more? More importantly how do i fix it?
__________________
Phil
1996 F-250 7.3L Powerstroke, Heavy-Duty Automatic Transmission and Torque Converter, 4x4 Auto-Locking Hubs, 1-ton rear axle with 3.55 gears, TC lock-up, EPBV switch, FPR shimmed to 66 psi, no cat, no muffler, 238,000 miles. Best Mod Ever: Edge Evolution Delete + Dealer Reflash
The E4OD will flash the OD lamp and store a code for a slip.
If and only "if it was in OD (4th gear). You have not stated a flash or code.
With above statement and the amount of rpm change you are seeing i
believe its a unlock not a slip.
Its was something electrical
Bill
Bill, I wrote down the code after it happened but now can't find it in my pickup. The OD light did flash. I'll look for that code again, it said something about a slip. I'm in a library, I can't believe that this area does not support data connectivity on my cell phone so I can use it on the internet. I've been all over the country and it has worked. When I called in, I was told this place in AZ, that I'm drawing off a 'mom & pop' tower. Oh well, what can I say, I'll just have to be 'off' the forum until next week.
I hope your right Bill, that it was a unlock, not a slip. I can say for sure though that the next day I pulled harder then I ever have. I was down to 43mph, the trucks were at 20mph, and the EGT gauge was at 1250*. I could have buried it if I wanted to. Even the motor was starting to get warm which I hardly ever see! Later, thanks for the input!!
__________________ Glenn
96 2WD F250 auto, 6637, 7 guages + scan guage, two trans coolers, 3 1/2" DP-4" exhaust, FS2500 oil bypass filter, D66 turbo, 6 position TW, 99 IC, syn oil, Elec fuel pump, adrenaline HPOP, 140v IDM, rear disks, Baby Beans Injectors, 203*, the 'cure', dieselsite's trans & radiator filter & Firestone air bags.
You can believe what you like, but there is no reason to always turn off overdrive when towing any sized load.
What about when you're towing a 42' trailer full of cars?
I had heard that OD was not meant for use while towing and that you could burn up the OD. am I wrong about this?
Yes. The only time you should shift out of OD is if the transmission starts hunting back and forth.
The "don't tow in overdrive" applies mostly to older gassers with economy geared rear ends. With the RPMs down (less cooling) and the torque up, the transmission would overheat when left in OD while towing.
Early E4 had programming that would turn off the coast clutch
with od off. This was to help with fuel mileage in the streets.
Its was changed to cc on full time until od (4th) is reached.
Bottom line is the od (on/off) has/had all to do with just engine braking.
were at in New mexico. anywhere around alamogetto?
No, just took I40 through to AZ. Finally back to a place where there is internet. I'm on my way back to Ne and no more slips. I still think that somehow the trans slipped because I used the TC lock switch at 70mph. Bill is probably right about some bad wiring or something that caused a slip. I'm not going to touch the TC lock again unless I need it for braking. As far as the discussion about towing in OT, I try to use common sense. If I'm slowing down below 65mph and the EGT's are getting above 1200 then I'll kick it into 3rd. Even with a very heavy load I use OT, mainly because I drive fast. Drive fast, your rpm,s are high, therefore no 'lugging' and everything stays cooler. This of course IMHO and my gut feeling. The guy who built my trans said the same thing but I have 4:10's so my rpm's are up there. I know, the safe way would be to drive a heavy 24K load would be about 60mph in n3rd gear. For one thing, that would drive me crazy and another my truck just doesn't feel like its preforming until its up to 2,300 rpm,s and above, then it just dig's in and put's muscle to work. I'm just hooked on that feeling, also the hel.... with fuel mileage, lol. Thanks
__________________ Glenn
96 2WD F250 auto, 6637, 7 guages + scan guage, two trans coolers, 3 1/2" DP-4" exhaust, FS2500 oil bypass filter, D66 turbo, 6 position TW, 99 IC, syn oil, Elec fuel pump, adrenaline HPOP, 140v IDM, rear disks, Baby Beans Injectors, 203*, the 'cure', dieselsite's trans & radiator filter & Firestone air bags.
Well, I'm back from my 2,500 mile trip. The last 1,650 miles and no slip. I still think it was my fault leaving the TC lock switch locked at 70mph. Or, faultly wiring someplace, I don't know. I do know that I really tested it out though. In eastern Colorado it was pouring rain and a 40mph head wind pulling my parachute. That's what I call the 42' enclosed trailer, its like pulling a parachute through the wind. I just left the cc on 65mph and the EGT gauge hovered right around 1,200* and the boost varied from 12psi to 25psi. Did this for a few hundred miles and not one slip on the old tranny.
__________________ Glenn
96 2WD F250 auto, 6637, 7 guages + scan guage, two trans coolers, 3 1/2" DP-4" exhaust, FS2500 oil bypass filter, D66 turbo, 6 position TW, 99 IC, syn oil, Elec fuel pump, adrenaline HPOP, 140v IDM, rear disks, Baby Beans Injectors, 203*, the 'cure', dieselsite's trans & radiator filter & Firestone air bags.
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. From reading the posts I think there is some confusion. I had troubles at 70mph with the TC locked, manually locked. After 50 miles or so of the TC manuall locked it slipped big time and I was going 70mph. The rpm's locked are about 2,400 at 70mph and when I looked down it was at 2,700 rpm's-slipping!!! I backed off right away and pulled off the road with my big load-22k. The next day I left the TC lock switch along and had no problems going another 400 miles. Going west on I40 into Flagstaf, AZ and another spot west of Flagstaff I worked the piss out of my pickup and never had a problem with slippage. The only conclusion I can come to is, LEAVE THE TC LOCK SWITCH ALONG AT HIGH SPEEDS. Use it only for extra braking but only if needed! I'm no expert here but my gut feeling is I was in the wrong messing with it at high speeds. 
- JEFF
