6637 Install
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Junior User
Joined: Mar 2009
Posts: 56
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From: Spencerport NY
6637 Install
O.K, I have been reading alot about a 6637 air filter.How hard are they to install on a 1999 7.3?I will also say that on a scale of 1-10,I am a 1 on fixing things and have very little tools.Is this something I should forget about doing? 
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Joined: Nov 2006
Posts: 11,288
Likes: 269
From: North of Greenville
If you have a large flat-tip screwdriver or a small ratchet and socket set, or even a small wrench (something like 5/16", I believe), then this install is about a 1 on a scale of 1-10 with 10 being the msot difficult.
You should be able to do this very easily, especially with all the help we can offer in here.
BTW... welcome to FTE!
You should be able to do this very easily, especially with all the help we can offer in here.
BTW... welcome to FTE!
Hotshot
Joined: Nov 2006
Posts: 11,288
Likes: 269
From: North of Greenville
You're best overall deal would probably be from Clay with Riffraff Diesel Performance is building kits which include the connection pipe that is typically more necessary on the early 99's. He's one of the site sponsors, and his link is here....
Riffraff Diesel Performance Parts
Riffraff Diesel Performance Parts
Hotshot
Joined: Dec 2006
Posts: 14,069
Likes: 17
From: Melbourne, Ky
I believe the NAPA number is 46637. You can get them at any place that sells truck parts for big trucks. NAPA sells them . I believe you can get them on line from some folks. There is a website that some folks on here get them through, but I don't remember who they are. Someone will post up here soon with it.
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Joined: Jul 2003
Posts: 12,177
Likes: 40
From: Newport, WA
I bought mine from Fleet Filter- cheaper than Napa by a long shot. Order at least 2 to save on shipping costs. Do you know if you have the stock early bird intake, or has it been upgraded to the late style? Most were upgraded but some weren't... that will decide if you just need a straight piece of 4" or if you need a 45*bent piece.
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Junior User
Joined: Mar 2009
Posts: 56
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From: Spencerport NY
This is an early 1999 (June 98).I only have 29,000 miles on it.If only driving this 2,000 miles a year is it worth it? I use it in the summer to pull my 5th wheel RV.
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Joined: Jul 2003
Posts: 12,177
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From: Newport, WA
You still need to check and see if the intake has been updated. Yes it is definitely worth it, the stock air box is notorious for leaking which causes dusting of the turbo and engine, which means an expensive repair bill.
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Joined: Jul 2003
Posts: 12,177
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From: Newport, WA
The early 99 intake says "Powerstroke Intercooled Turbo Diesel" or something to that effect on the airbox lid. The late style intake doesn't say anything. That's probably the easiest way to tell.
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Joined: Jul 2003
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From: Newport, WA
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Junior User
Joined: Mar 2009
Posts: 56
Likes: 0
From: Spencerport NY
The truck is put away until May,but what I can remember I think is the early model.This truck was made in June of 1998. Thanks to everyone for your help,and the good pictures.
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Ron
Early 1999 F350 DRW only 29,000 miles.
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Ron
Early 1999 F350 DRW only 29,000 miles.