I bought a 2004 supercrew FX4 f150 2 days ago. I noticed the turn-downs on the exaust facing so that they blow just below the back axel.

I took it to a mechanic to get checked out and he said it would wear down the grease inside from the heat. truth to this? is this bad? Thanks

-Cody

 

I believe the mechanic misinformed you about the diff. lube in your rearend.Its a heavy weight,at least a 90W lube.I dont believe the temp. of the exhaust exiting from the cutouts will ever reach a point that it will burn or cook the lube out of your rear end.Can you imagine these temps.? I believe your truck would have to be on fire to reach them.You'll be fine where your dumps are at.If you want it a little quiter,run the pipes all the way out the back, over the axle.Hope this answered your question,good luck.

 

wow thanks. Here's some pics..

 

I tried to get dumps yesterday but apparently they are illegal in Virginia. Atleast thats what the shop told me.

 

so I guess you think they are safe then? seems like dude knows what he's talkin about saying it won't hurt. I'm leaning that way.

 

they wont hurt a thing

 

my father keeps telling me the same thing about my 56. the exhaust dumps just a few inches before the rear axle. only thing that sucks, is that the exhaust leaves spots on the rearend and the paint doesnt seem to want to stay on there. as for now, i will keep my setup the way it is