3" Down Pipe Clearance Manual Trans - Ford Powerstroke Diesel Forum
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Old 08-29-2010, 09:05 PM
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3" Down Pipe Clearance Manual Trans

I paid a shop to remove the factory DP and install a 3" DP with 4" Exhaust. Notice a hell of a lot noise in the cab and could feel a vibration on the floor board. Crawled under the tuck and noticed the DP is right againest the bell Housing and they did a lousy job of making clearance on the Firewall seam. I worked with a pry bar as best I could which helped but the only option I see for clearing the bell housing is to remove the DP and put a dent in the pipe where it makes contact. Better yet take it back have the shop and they can get it right.

Yes a 3" DP on the OBS Trucks is a tight fit on the Firewall but what about the Manual Trans clearance issue? Frustrating that a shop that specializes in Diesel Performance can't get it right the first time. Anyone have this problem with 5 Speed Manual.

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Old 08-29-2010, 09:30 PM
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there should be enough room if you bang in the firewall enough and even that doesnt have to be that much. Mines got a good inch of clearance on both sides, i would take it back and see whats up and if they dont fix it take the pipe out and bang the firewall a little more in. also which brand downpipe did you use?
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Old 08-30-2010, 04:54 AM
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I just did a manual swap and the DP rubs a lot more... hope i would have taken advantage of having the trans out and banging the crap out of the fire wall then. If your down pipe is in two pieces (like the MBRP), shouldnt be that hard to take it off and pry away.
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Old 08-30-2010, 04:54 PM
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Took my truck in this morning to the shop that installed my exhaust system and they re-installed the complete system. Re-worked the Firewall to increase clearance and got the DP to clear the Bellhousing. Soooo much better and it Sounds good in the Cab. Amazing is the noise from 1/2" of Down Pipe touching the Bellhousing. Lesson Learned and just glad the shop corrected the error without a hassle.
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Old 08-30-2010, 05:11 PM
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Manual trans trucks, have been known to have less room for the DP. Glad you got it fixed.
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Old 08-30-2010, 05:31 PM
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If you have saggy body mounts it makes it harder too just my .02 cents
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Old 12-07-2010, 10:03 PM
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I installed my 3" downpipe myself. I was having the same issue with it banging on the bellhousing. After a few adjustments I think I've got it clear.

I agree the noise it makes and vibrations it caused were greater then what I would have imagined.
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Old 12-07-2010, 10:19 PM
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Quote:
Originally Posted by 96F350KID View Post
If you have saggy body mounts it makes it harder too just my .02 cents
sorry kind of off subject don't mean to hijack, but are body mounts hard to replace? mine are toast
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Old 12-08-2010, 12:55 PM
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yeah i had the same problem with mine. i replaced the guillotine style clamp with a STAINLESS BANDCLAMP and it clears nicely now. it still does rub up on the body seem and i can hear a vibriation at idle.
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