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overheating 6 spd??

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Old Dec 7, 2001 | 03:59 PM
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overheating 6 spd??

I am wits end. My '99 F-350 PSD is my dream truck, except for one irritating thing. After long freeway runs, I mean 5-6 hours at 70-75 MPH, my tranny gets very hard to shift through the gears. Sometimes it is a fight to get back to speed. I thought it was the fluid overheating,so I put Semi-synthetic fluid in, no fix. Also, I read another post about a clutch engaging right off the floor, mine has done this since 8000 mi, when I bought it.
Also, lately, when downshifting from OD to 4th, it grinds just a bit everytime.
No, I dont abuse the clutch, I do do some towing, but not a lot, the truck just turned 83,000 on the original clutch, and I am thinking I am due for a new clutch, but the sticky shifter has me baffled....
Thanks, Steve
 
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Old Dec 8, 2001 | 09:17 AM
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overheating 6 spd??

[updated:LAST EDITED ON 08-Dec-01 AT 10:18 AM (EST)]You may want to drain the tranny again and try blowing air through the cooling lines to make sure they or the cooler are not clogged. Possibly you may have a bad or weak fluid pump as well. As for the low clutch check out www.intellidog.com/dieselmann/home.html. There you will find TSB 99-1-6. I had this TSB performed for the low pedal and now it works like a new clutch.

Les
 
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Old Dec 8, 2001 | 11:15 AM
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overheating 6 spd??

Kinda wondered about a plugged line, but do you blow from the cooler to the tranny? And do you know where the pump is? Have you ever heard about another tranny doing this? Thanks Les, going to go check out the web site now....
 
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Old Dec 8, 2001 | 06:07 PM
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overheating 6 spd??

I have a 6spd and have been driving 2 company 5 speeds for 6yrs and have never seen or heard of this happening. I would disconnect both lines and blow into them either way since I don't remember which is the outlet or inlet and if there is anything in them you won't be blowing it back into the tranny. I'm not sure where in the tranny the pump is located either. The other 2 PSD 5speeds I drive have 99k and 105k on trannys with the original fluid in them, I know it's not smart but that's the way the company maintains thier trucks. My PSD 6spd has only 35k on it. I changed to Mobil 1 full synthetic at 25k just for the h*ll of it and the factory fluid was good but the transfer case fluid was a bit burnt.

Les
 
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Old Dec 10, 2001 | 07:38 AM
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overheating 6 spd??

Do manual trannies even have cooler lines? I thought only automatics have them. Unless this is something new to HD manuals?
 
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Old Dec 10, 2001 | 12:23 PM
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overheating 6 spd??

The 6 speeds DO have cooling lines that run to the radiator just like the autos.

Les
 
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Old Dec 10, 2001 | 02:46 PM
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overheating 6 spd??

I stand corrected, good to know though!
 
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Old Dec 10, 2001 | 04:41 PM
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overheating 6 spd??

 
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