Talk to the experts. Call 800.979.0122, 7am-10pm, everyday.

GIFT CARDS

DEALS

TRACK ORDER

HELP CENTER

My

List

Menu

Shop

Garage

Cart

Account

Products to Compare (max of 3)
X
Compare These Parts

Quick Change R&P Ratio Without Opening Up the Rear

6/22/2018
Add Article To List

Common question: Can I determine my Quick Change R&P ratio without opening up the rear?

Answer : Yes.

  1. Elevate the car (engine off).

  2. Remove quick change gears.

  3. Chalk mark the tire at the 12 o’clock position.

  4. Chalk mark the pinion at the 12 o’clock position.

  5. Rotate the tire by hand 1 complete revolution.

  6. Count pinion rotation as tire is rotated.

  • Just past 4 revolutions = 4.11 or 4.12 ring and pinion

  • 4 – ½ revolutions = 4.57

  • Almost 5 revolutions = 4.86

Related Articles

 Selecting Quarter-Turn Fasteners
by Jason Lubken - Posted in Tech
8/13/2021
There are several types of quarter-turn fasteners used in the performance automotive aftermarket and in this buyer's guide we'll help show you the correct fastener for your application and how some of the most common types of fasteners are used.
Setting Up Your Modified Race Car
by Speedway Tech Team - Posted in Tech
5/8/2018
In order to be competitive and win, it's important to find the right set up that works for you and your car. Here's some general reminders to remember during set up!
How Big of Tires Can I Fit - Plus Sizing Guide
by Mark Houlahan - Posted in Tech
3/7/2023
Changing your tire’s profile, be it width, height, or both, can provide increased traction, braking, and handling. Learn more in our guide.
Mopar Flexplate Identification Guide
by Mark Houlahan - Posted in Tech
1/25/2023
Determining the correct flexplate for your V8 Mopar-powered project takes a little understanding of how these engines were balanced. Our Mopar flexplate buyer’s guide will help.
Ford Flexplate Identification Guide
by Mark Houlahan - Posted in Tech
1/13/2023
Ford’s small block and big block engine families have their share of flexplate differences. We’ll show you what to look for in this buyer’s guide.
LS Engine Flexplate Fitment Guide
by Mark Houlahan - Posted in Videos
1/11/2023
The LS swap is no doubt still going strong, but if you’re planning to run an automatic behind your 4.8, 5.3, or 6.0L LS-powered ride, you’ll need to pay attention to a few items we discuss in this buyer’s guide.
Small Block and Big Block Chevy Engine Flexplate Guide
by Mark Houlahan - Posted in Tech
1/11/2023
Over several generations of small block Chevy (and big block Chevy) engines there have been several changes that dictate what flexplate works with them. We’ll help you determine the correct flexplate for your Chevy engine in this buyer’s guide.
Why Convert to A One Wire Alternator
by Mark Houlahan - Posted in Tech
12/29/2022
Learn how to hook up a 1-wire alternator on your vehicle. 1-wire alternators are perfect for engine swaps or just keeping things simple for your project.
What You Need to Know About Flexplates
by Mark Houlahan - Posted in Tech
12/27/2022
The engine’s flexplate is a critical part to transferring power to your drivetrain. Using the correct part is imperative to engine longevity and proper drivetrain assembly.
Ammeter vs Voltmeter: How They Work, and Which One Is Right for Your Car
by Mark Houlahan - Posted in Tech
12/21/2022
Ammeters and voltmeters are two very different ways of monitoring your vehicle’s charging system. Both are better than an “idiot light” but which one is right for your build?
Error
X
Note
X
Ok