High transmission temps. - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 9 (permalink) Old 05-31-2010, 12:03 AM Thread Starter
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High transmission temps.

Noticed this for the first time today while pulling a hill with a load of chips/dragging a 5700# chipper. Gauge went into the yellow and stayed there..even after unloading?
We just purchased this 2003 F550 7.3 (43k miles), the previous owner just had the trans filter/oil changed because he saw high temps as well.
Now what? Any ideas where I go from here? I've only put 150 miles on it, and never saw the gauge jump like this

Thanks, Tony
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post #2 of 9 (permalink) Old 05-31-2010, 01:43 AM
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Get a real transmission gauge because that one won't tell you what's happening until it's too late.

It could be any number of things, but consider changing the transmission cooler to a larger one for starters.

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post #3 of 9 (permalink) Old 05-31-2010, 02:36 AM
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Check it for codes
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post #4 of 9 (permalink) Old 05-31-2010, 02:38 AM Thread Starter
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PRT,

I'll do that. The trans seems to have been functioning properly up until that point. Then it was as if your engine/trans was missing or slipping.
Didn't know what the hell was going on until I checked the gauges.
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post #5 of 9 (permalink) Old 05-31-2010, 03:11 AM
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If you had slipping issues, that transmission likely is on it's last leg. Get 'em hot enough, and they won't recover.

Just how much total weight were you haulin'?

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post #6 of 9 (permalink) Old 05-31-2010, 03:18 AM Thread Starter
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The truck...

weighs in at 11,000, plus 3 ton of chips, dragging a 5,700 pound chipper 5 miles with two moderate grades.
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post #7 of 9 (permalink) Old 05-31-2010, 03:22 AM Thread Starter
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Of course,

my F350 with a 460/C6 would pull this prior to buying this new truck. I think the F550 is equipped for this???
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post #8 of 9 (permalink) Old 05-31-2010, 03:32 AM
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Your old truck may not have had a bad transmission from the start.

You did say the previous owner noticed similar issues, right?

Do you know how the previous owner treated this truck? He could've pulled 2-3x that weight up the same grade(s) and nearly burnt the transmission up already.

The truck should be equipped to handle the towing, but the transmission is the weak link in that drivetrain. Those trucks really should've all come with manuals in them instead of automatics. It's not as though Ford thought to upgrade the automatic transmissions for the extra towing in the F450/F-550 line.

Did you check the fluid to see if it smells burnt or the color has changed?

You could also have a clogged cooler or other internal issues that aren't helping matters.

Wish you well, but I've about exhausted my already limited knowledge of transmission diagnoses

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post #9 of 9 (permalink) Old 05-31-2010, 03:40 AM Thread Starter
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Thanks,

I'll check those other culprits Monday.
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