Does Anyone Run 3.73 Gears in Their Mark VIII ??? - TCCoA Forums
 3Likes
  • 1 Post By Trunk Monkey
  • 1 Post By decipha
  • 1 Post By decipha
 
LinkBack Thread Tools
post #1 of 13 (permalink) Old 02-17-2019, 02:08 PM Thread Starter
Newbie
 
tailfin Joe's Avatar
 
Join Date: Nov 2018
Posts: 3
Garage
Does Anyone Run 3.73 Gears in Their Mark VIII ???

I have a 1998 Mark Viii CE I would like to run 373 gears what are the pros and the cons ? Thanks Joe
tailfin Joe is offline  
Sponsored Links
Advertisement
 
post #2 of 13 (permalink) Old 02-17-2019, 05:18 PM
Road warrior extrodinaire

Super Moderator
 
Trunk Monkey's Avatar
 
Join Date: Feb 2006
Location: This week: Bismarck, ND
Posts: 11,663
Garage
See this old club links for answers:

https://www.tccoa.com/articles/gears/gears2.html

I run 3.73's in my car and most here do. I highly recommend them.

Mods? Yea, I got mods ...
Air silencer delete, warp drive, dilithium crystals, flux capacitor, Slingshot Rubber band power adder, Moonshine & Gas, Leaf Blower Supercharger, Hamster Wheel & Hamster, Energizer Bunny generating 1.21 gigawatts, Mr. Fusion® Home Energy Reactor, hover conversion and a sextant celestial navigation system (The original GPS)
Best 1/4: 1,320 nanoseconds @ 670,616,629.2 miles per hour

"There isn't that much difference anymore between spacecraft, aircraft and modern automobiles..." - Keith Henry, NASA's Langley Research Center
See a list of my real mods and pictures of my car HERE. The true performance of my car was made possible by the Carolinas Crew Chief, RobertP at Rob's Tire & Auto

Last edited by Trunk Monkey; 02-17-2019 at 05:34 PM.
Trunk Monkey is offline  
post #3 of 13 (permalink) Old 02-17-2019, 07:14 PM
PostWhore
 
Woodman's Avatar
 
Join Date: Jan 2010
Location: Duluth, MN
Age: 44
Posts: 1,864
Garage
Pros:

Better acceleration.

Cons:
Needs a tune for correct shift points.
Higher highway RPM, close to 2600 at 75mph, not horrible, but higher than normal.
Some loss in MPG, between 22-24 mpg at highway speeds depending on a few factors.

97 Thunderbird LX (The GT Bird)
2003 Explorer WAP block with Modular Head Shop "street ported" heads and Stage 2 PI NA cams, 75mm Accufab throttle body, C&L upper intake plenum, Kooks 1.75" primary/3" collector headers, 2.5" full exhaust with mid mount Magnaflow dual in/out muffler, 24lb/hr injectors, 80mm MAF, Tuning from Don @ www.lasotaracing.com, CAI that feeds from fenderwell. Jmod, 3.73:1 TL in Mark VIII carrier, Mark VIII aluminum LCAs, 93 Mark VIII driveshaft, PBR brakes (soon to be Cobras), 18x9 wheels with 35mm offset, 255/40/ZR18 Tires, Front and Rear strut/shock bracing, GR-2 shocks, Eibach 1.5" springs, 1989 SC front and rear sway bars.
Woodman is offline  
Sponsored Links
Advertisement
 
post #4 of 13 (permalink) Old 02-27-2019, 07:51 PM
Newbie
 
Join Date: Jan 2011
Location: westerville,ohio
Posts: 1
I have them .its the best mod on my tbird.big difference and my gas mileage is better.i drive in the city mostly
biker is offline  
post #5 of 13 (permalink) Old 03-16-2019, 07:27 PM
1st Gear Poster
 
Third Ford Burden's Avatar
 
Join Date: Oct 2009
Location: PNW
Posts: 35
Garage
Question

I was thinking 3.55 for my 96 Mark VIII, but sounds like MPG on the highway would not be much better...?
Third Ford Burden is offline  
post #6 of 13 (permalink) Old 03-16-2019, 08:23 PM
Road warrior extrodinaire

Super Moderator
 
Trunk Monkey's Avatar
 
Join Date: Feb 2006
Location: This week: Bismarck, ND
Posts: 11,663
Garage
Nope, not that big of a difference.

I think Matt runs 3.55's he could tell ya.
Third Ford Burden likes this.

Mods? Yea, I got mods ...
Air silencer delete, warp drive, dilithium crystals, flux capacitor, Slingshot Rubber band power adder, Moonshine & Gas, Leaf Blower Supercharger, Hamster Wheel & Hamster, Energizer Bunny generating 1.21 gigawatts, Mr. Fusion® Home Energy Reactor, hover conversion and a sextant celestial navigation system (The original GPS)
Best 1/4: 1,320 nanoseconds @ 670,616,629.2 miles per hour

"There isn't that much difference anymore between spacecraft, aircraft and modern automobiles..." - Keith Henry, NASA's Langley Research Center
See a list of my real mods and pictures of my car HERE. The true performance of my car was made possible by the Carolinas Crew Chief, RobertP at Rob's Tire & Auto
Trunk Monkey is offline  
post #7 of 13 (permalink) Old 03-17-2019, 12:26 AM
PostWhore
 
decipha's Avatar
 
Join Date: May 2007
Location: New Orleans, LA
Posts: 1,472
usually in city driving the mileage goes up with gears
Third Ford Burden likes this.

supercoupin'

www.EFIDynoTuning.com
decipha is offline  
post #8 of 13 (permalink) Old 03-17-2019, 09:27 AM
Kind of slapped together
 
Join Date: Jan 2010
Location: Bossier City, LA
Age: 63
Posts: 4,786
Quote:
Originally Posted by decipha View Post
usually in city driving the mileage goes up with gears
I'm hoping so on my Dakota; it's a pickup which sucks already (about 17MPG or so on the highway), and I've just about to start a 40-hour-week job in town, which will make it somewhere the wrong side of fecal ...

But the truck has 2.94 rear gears in it now. I'm planning on going to 3.54 (Dodge 8.25 rear end) hoping it'll help in town some.

On my 1991, I've got a set of 3.55 gears to drop in when I get my spare pumpkin rebuilt this summer (maybe!)

That can't hurt in town any ...

RwP

Fuelly
RalphP is offline  
post #9 of 13 (permalink) Old 03-17-2019, 10:53 AM
Humble MN12 Genius
Super Moderator
 
XR7-4.6's Avatar
 
Join Date: Apr 2006
Location: Roselle IL
Posts: 16,394
Garage
Send a message via Yahoo to XR7-4.6
Quote:
Originally Posted by Trunk Monkey View Post
Nope, not that big of a difference.

I think Matt runs 3.55's he could tell ya.
With the PI/4R70w/3.55/26” tire combo I got 28mpg highway @65mph on one leisurely trip so they’re not bad on highway by any stretch. I usually got a combined average of 18mpg with mostly city driving.

-Matt
XR7-4.6 is offline  
post #10 of 13 (permalink) Old 03-18-2019, 01:24 AM
PostWhore
 
decipha's Avatar
 
Join Date: May 2007
Location: New Orleans, LA
Posts: 1,472
thats pretty amazing. My ls1 camaro only gets 26.5 mpgs with the cruise set to 85mph. My 03 Marauder can't even best 23mpg with the cruise set at 85mph.

I'm afraid I will never know what any of my vehicles get at 65 I simply cannot drive that slow.
Grog6 likes this.

supercoupin'

www.EFIDynoTuning.com
decipha is offline  
post #11 of 13 (permalink) Old 03-18-2019, 11:59 AM
PostWhore
 
Woodman's Avatar
 
Join Date: Jan 2010
Location: Duluth, MN
Age: 44
Posts: 1,864
Garage
Quote:
Originally Posted by decipha View Post
thats pretty amazing. My ls1 camaro only gets 26.5 mpgs with the cruise set to 85mph. My 03 Marauder can't even best 23mpg with the cruise set at 85mph.

I'm afraid I will never know what any of my vehicles get at 65 I simply cannot drive that slow.
Compare apples to apples.

What transmission in the Camaro? T-56? If so, that's got a .5:1 6th gear, so your RPM's at 85 are going to be around 1900. Your Marauder has 3.55's in it if it's stock, and the 4r70W with it's .7:1 OD is going to have the RPM's around 2500, and that's well beyond the "sweet spot" for the DOHC 4.6. Add to it they're a bigger, heavier car and they just aren't going to get great MPG.

97 Thunderbird LX (The GT Bird)
2003 Explorer WAP block with Modular Head Shop "street ported" heads and Stage 2 PI NA cams, 75mm Accufab throttle body, C&L upper intake plenum, Kooks 1.75" primary/3" collector headers, 2.5" full exhaust with mid mount Magnaflow dual in/out muffler, 24lb/hr injectors, 80mm MAF, Tuning from Don @ www.lasotaracing.com, CAI that feeds from fenderwell. Jmod, 3.73:1 TL in Mark VIII carrier, Mark VIII aluminum LCAs, 93 Mark VIII driveshaft, PBR brakes (soon to be Cobras), 18x9 wheels with 35mm offset, 255/40/ZR18 Tires, Front and Rear strut/shock bracing, GR-2 shocks, Eibach 1.5" springs, 1989 SC front and rear sway bars.
Woodman is offline  
post #12 of 13 (permalink) Old 03-18-2019, 12:10 PM
Humble MN12 Genius
Super Moderator
 
XR7-4.6's Avatar
 
Join Date: Apr 2006
Location: Roselle IL
Posts: 16,394
Garage
Send a message via Yahoo to XR7-4.6
Quote:
Originally Posted by decipha View Post
thats pretty amazing. My ls1 camaro only gets 26.5 mpgs with the cruise set to 85mph. My 03 Marauder can't even best 23mpg with the cruise set at 85mph.

I'm afraid I will never know what any of my vehicles get at 65 I simply cannot drive that slow.
On the same trip I got a $200 out of state ticket for doing 80 in a 65 zone, so I kept it at miserly 65 dead on the way back to achieve that! The rest of the time highway economy was typically the same as your Marauder.

-Matt
XR7-4.6 is offline  
post #13 of 13 (permalink) Old 03-24-2019, 07:23 PM
PostWhore
 
decipha's Avatar
 
Join Date: May 2007
Location: New Orleans, LA
Posts: 1,472
well thats where you made your mistake

the way I see it double jeopardy prevents you from getting a repeat ticket

supercoupin'

www.EFIDynoTuning.com
decipha is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the TCCoA Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 



Similar Threads
Thread Thread Starter Forum Replies Last Post
How does 3.73 gears change shifts (96)? 96PRLBRD 4R70W Transmissions 12 06-27-2011 09:46 AM
Does anyone index their plugs? 94t-birdlx General Tech 11 07-02-2005 11:50 AM
Anyone replaced their "window run?" Embalmer Exterior 2 03-08-2005 02:22 AM
does anyone run this setup mn112viii Exhaust 0 12-19-2004 12:54 AM
Does Anyone Have Pics Of Clear Corners On Their 96-97 Bird? projectmayhem021 Exterior 12 08-17-2002 09:14 AM

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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome