SuperMotors.net Forums
Goyapower
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• lowell, MA, USA |
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• Registered on 8/20/2016 |
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• 2 posts |
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 Posted:8/24/2016 16:50 |
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Im sure this has been asked! Going to upgrade my gears to 3.55 or 3.73 on my 05 marquis and wanted to see if there was a post on basic info about it! On what is needed or what l should and not should do!Thanks in advance |
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jdmeaux
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• Lafayette, LA, USA |
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• Registered on 1/5/2009 |
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• 525 posts |
• 1
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Posted:8/25/2016 08:00 |
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You may want to look at www.p71.ca or www.crownvic.net for info of that magnitude. Going to 3.55 gears will not require a tune, but anything higher will.
Best of luck.
*******************
PROUD MEMBER of www.crownvic.net
It's just a SUPER-DUTY Mustang GT Sedan. 198K miles and still rolling HARD.
1997 Crown Victoria P71 SVT *** ex-US Marshall service (the CAR)
STOCK?? I bet it was modified. 
13.26 @ 107.24 MPH 1/4 mi w/ me, tools, & full tank of 93 octane
I added CAI, NICHE 19 X 8.5 " wheels with 245/45ZR 19 rubbers, and completely rebuilt the front end with poly bushings, Kooks headers, 2 1/4inch exhaust, TCI 2200-2400 rpm Stall converter
.PLANS:: engine upgrade, 5.4L 2v stroker, rebuild interior in leather w/ buckets, thinking about turbos
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