Putting factory tune on catless 5.0 with 3.73 gears - MustangForums.com

GT S197 General Discussion This section is for technical discussions pertaining specifically to the V8 variation of the 2005 and newer Ford Mustang.
Sponsored by:
Sponsored by:

Thread Tools Search this Thread
Old 09-01-2014, 09:58 AM   #1
Thread Starter
om3n's Avatar
Join Date: Jul 2011
Location: MI
Posts: 49
Default Putting factory tune on catless 5.0 with 3.73 gears

Hey guys,

I bought this 2011 mustang 5.0 GT, and the previous owner removed the cats and put a tune on it. Long story short I started a thread about this a while back HERE, but I am getting the typical MT82 gear whine issue and I'd like a dealership to take a look at it under warranty, if I can get that to happen. I had a bad experience with my usual dealership, and now I'm going to look for a "mod friendly" dealership, if I can, to check out the trans. Note that it currently has about 46K miles.

I kind of want to put the factory tune back on the car to remove one of the mods that my dealership complained about (I have the tuner with both the factory tune and the new one), but I'm a bit reluctant because of the lack of cats and the 3.73 gears. I'm not sure if the check engine light will come on because of the cats, and I'm not sure if there will be issues with the 3.73 gear either, but I believe the 3.73 came from the factory according to the previous own (not 100% sure he is right).

What do you guys think? Will that cause more problems than it's worth?
om3n is offline   Reply With Quote
Old 09-01-2014, 10:08 AM   #2
3rd Gear Member
scottmach's Avatar
Join Date: Feb 2006
Location: Connecticut
Posts: 557

You will get a CEL for the rear o2's being turned off as well as COT.

There will also be issues with the 3.73's if your car didn't come with them but that's minor compared to the lack of cats.
scottmach is offline   Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
2002 Mustang GT Premium 5 Speed JonnyBlazeGT Mustangs For Sale 3 11-03-2015 01:10 AM
Help on some decisions! Barcafut13 2005-2014 Mustangs 9 09-01-2015 06:08 AM
HELP!!! New to Mustangs and this Forum Figure8allday 4.6L (1996-2004 Modular) Mustang 6 08-22-2015 11:11 AM
2013 GT500 GB/BS, 3,700K miles, All options except glass roof, 8yr/36k mile ESP inyadreems Mustangs For Sale 2 08-21-2015 09:10 AM
94 gt bucking / jerking on decel dfw692 5.0L (1979-1995) Mustang 4 08-07-2015 11:53 PM

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

All times are GMT -5. The time now is 08:22 PM.