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I have a 99 F-250 V-10 4x4 with 61,000 miles. When I drive the truck for about 15 to 20 minutes a strong smell of greese comes from somewhere under the truck. I can not figure out if the smell is coming from the rear or the front of the truck.
My truck does not leak any fluids and does not burn any oil. I can not find any evidence of a leak anywhere on the truck. I did notice that the smell was not as bad during the cold months but now since some warm weather has arived the odor is back.
I am at a loss on this one, does anyone have any ideas?
Any thing crawl up into a tight spot and die or do you have friends with a weird sense of humour that would stuff something some where to cause a stink? Try hosing it off underneath in every nook and cranny. Don't get any water into your plug recesses or electronics.
How long has this been going on? Did you buy the truck used?
My first recommendation is to check your seats. I had to have some work done on my F150 and it smelled like a paint shop for weeks because they took the seats out and did the re-work next to the paint booth and the velour interior just soaked up the stench.
Is it a burning smell or just a grease like odor? Check the fluid level in both rears to make sure they are full. Gear oil has a funky smell to it. Maybe your level is low and the rears are running a little hot. If so, the heat may be purging some pressure and hence odor out of the vent tubes. Just a theory
I agree with the rear diff idea... gear oil does smell strongly if it runs very hot. Check the rear diff, if you can stick your pinky in and bend it down and touch oil, you're fine. If not, it's low.
You know the smell when you pass by a paving project or that of some driveway sealers? If that's the smell you smell, it is definately gear oil, most likely from one of your pumpkins.
The problem is why are you smelling that? Especially with no obvious leaks? I'd do like they say, check the fluid level. It can be just below the plug and still be OK, b ut not much.
How does it stop? Do the brakes seem to work as they always have? Drum brakes in the rear? During your 15-20 minutes of driving, do you use the brakes much, or is it mostly non-stop driving? If you have rear drums, use your brakes quite a bit, have noticed pulling or grabbing (especially on wet or slippery surfaces), you might have a rear wheel seal leak. That gear oil will make a drum brake do wierd stuff and it will stink up the joint.
(Hey bigred..., I really didn't copy your answer, I was writin' mine when yours popped up. Didn't mean to steal your thunder.)
Last edited by MuddyAxles; Mar 28, 2007 at 07:31 PM.
I lost a tranny one time when I replaced the slave cylinder, lost some tranny gear oil
If it is a standard the tranny may be low???? Tranny oil if it gets hot will really smell