Drivetrain Biggest Gear Ratio For 95 Mustang? (found 4.56)

98Mustang2017

Active Member
May 3, 2017
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ct
The biggest gear ratio i found so far was a 4.56 for around $250 Anything bigger ?
MUCH better than the snail-of-a-pace 2.73 thats for sure.
 
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wmburns

SN Certified Technician
Aug 14, 2009
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Look up something called "critical rotation speed" and how it relates to higher order vibrations.

Is this a manual or automatic? If automatic this will also affect the transmission itself as well as the drive line.

Regardless. Consider wisely. Maybe there IS a reason why you don't see those really low rear end gears that often. At the minimum getting the set up perfect for a noise free set is going to be.......tough.

Here's some links to review.

http://spicerparts.com/calculators/driveshaft-safe-operating-rpm-calculator

http://www.markwilliams.com/driveshafttech.aspx

http://www.4xshaft.com/driveline101.html

https://www.drivelinesnw.com/part-trouble-shooting/vibration-analysis/

http://www.machineservice.com/technical-101/vibrational-issues/

http://www.americanmuscle.com/mustang-rear-differential-gears.html

NOTE: pay attention to the parts about what happens when the rotational speed of the drive shaft gets at or above the critical speed of the system. This might make a great "lesson's learned" thread.

>>from one of the links.
  • REMEMBER THIS: When a drive shaft runs at its critical speed, IT ALWAYS FAILS, and the failure is ALWAYS CATASTROPHIC.
 
Last edited:

98Mustang2017

Active Member
May 3, 2017
162
17
38
ct
I just ordered a 4.56 kit and am aware of the critical shimming process required on installation as well as the pinion depth and backlash.
Car is a standard 5 speed.
Also am aware the engine will be spinning about [email protected] and fuel efficiency will go down significantly.
Will definitely need some better gripping and wider tires because i love a good 0-60.
 
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