12.7:1 Fast Ratio Steering Gearbox Conversions

Fast ratio upgrades improve vehicle control, making driving safer and more enjoyable. Convert your slow ratio steering gearbox to a fast ratio (12.7:1) with a lifetime limited warranty.

just a note to let you know got gear back as promised. Installed it and just got back from test drive. Absolutely one of the best upgrades I have ever done!!! Was better than I had hoped!!! Thanks for excellent service and great product!!!
— Steve - MN - 1967 Chevelle (Aug 2017)

Fast RAtio Rebuilds:

Fast Ratio Upgrade in 1964 Oldsmobile Jetstar 88

PowerSteering.com can convert your power gearbox from the slow factory ratio to the 12.7:1 quick ratio installed on the “SS” Monte Carlo, Trans Am, and Firebirds of the ’80′s. You will notice a dramatic improvement in response, road feel, and driving pleasure WITHOUT losing valuable turning radius. Try it - its guaranteed, if you want to convert back to the old ratio, we'll do it at no charge. 

  • The steering unit is cleaned and inspected for external damage and physical function.

  • Then it is disassembled, all components are detergent washed and inspected.

  • Shafts are reconditioned and polished or replaced.

  • Housings are honed or sleeved as required.

  • All parts are solvent cleaned as a last step prior to assembly.

  • The unit is reassembled with new OEM (original equipment manufacturer) seals, Teflon rings, O-rings, bearings and other parts as needed.

  • All settings and adjustments are set to factory specifications.

  • Final testing is performed for function, pressure and leaks.

  • Standard detailing includes priming & painting the final assembled unit.

“Extreme” detailing takes the unit down to bare metal and each external component is finished prior to assembly. Primer is applied to the bare housing then sprayed with “cast” paint for a maintenance free finish. Other exterior components are taken to bare metal and sealed with a clear coat to replicate  the way they left the factory. Custom colors available. 

NOTE:  If a unit is non-rebuildable due to damage or internal corrosion, the customer is notified of their options:

  • Return the unit to the customer

  • Customer can supply another core

  • Supply the customer with a rebuildable core or core component for an additional charge. 

Just wanted to say thank you. System went in great, instructions were invaluable, and the feel of the car is fantastic. You were so right, no need or desire for a rack and pinion setup after this. Thanks for the hard work and craftsmanship you put into the parts, truly appreciated and made all the difference in the car.

My 1967 Caprice front end is complete now.
The steering gear box you all built for my car compliments the other components that were already installed.
It was already fun to drive now I joke with my wife that my cars steering is better that her 2011 Mustang.

More testimonials on the Customers and Cars page


Fast ratio power steering gearbox conversions are available for the following applications (NOTE: If you don’t see your application listed, call 417-374-7627):

  • GM cars from the 1960’s and 1970’s (Camaro/Z-28, Firebird Formula/Trans Am, Lemans/GTO/Grand Am/Grand Prix, Cutlass/442, Skylark, Mailbu/Chevelle: A-Body, B-body, F-Body, G-Body etc.)

  • Some Ford/Mercury cars (1971-1973 Mustang, 1972-1976 Torino, etc.)

  • AMC cars from the 1960’s and 1970’s (AMX, Javelin, Ambassador, Matador, Rambler, Rebel, Hornet, Gremlin without rack & pinion)

  • Dodge & Chevy trucks (16:13:1 upgrades available)


Each gear box is disassembled, cleaned and rebuilt to factory specifications with factory hard parts and seals. No need to change anything!

Converting To 12.7:1 Quick Ratio Power Steering Is Easy

  1. Remove your power steering gearbox

  2. Bring or send it to PowerSteering.com. (please see our shipping guide)


Learn more about Ratios and Internal Stops in this Tech Tip:

 Tale of Two Gearboxes - Same Lock to Lock Turns in each...


  • 12.7:1 Fast Ratio rebuild: $428.00 (plus shipping)

  • Standard Detailing: Included at no charge (primed & painted in "cast" replication paint, black available upon request.)

  • Extreme Detailing: $49.00 (Show quality detailing. Housing is stripped to bare metal, primed and painted in automotive "cast" replication paint. External aluminum and steel components are glass bead blasted and clear coated. Date coded is confirmed for the vehicle or re-stamped to match.)


What is a quick-ratio conversion and why would I want one?

During the 1960s and 1970s, GM installed power steering gearboxes in their “A” and “F” body cars that had a very slow turning ratio. It took as many as 4 to 4½ turns of the steering wheel to get the wheels to turn from extreme right to extreme left. This slow turning ratio was most noticeable when parking or negotiating curves. Not only does it take more turns of the steering wheel to turn the wheels, it also takes more turns of the steering wheel to correct the direction of the car. This means that correcting quickly in a curve or taking evasive maneuvers to avoid an accident or road hazard takes longer with a slower turning ratio.

With our quick-ratio conversion, we install a factory quick-ratio worm gear and power piston in your gearbox as it is rebuilt. This will give you a 12.7:1 ratio and bring your car from lock to lock in 3 turns or less, depending on your car’s application. This will greatly enhance the car’s driveability, handling, and ability to avoid road hazards.


What is a "fast ratio" and what is a "slow ratio"?

In the 1960’s , GM used, almost exclusively, a 20:1 ratio power steering gear in most of their cars.  Some of the exceptions were the 1969 Camaro and some full size Pontiacs that had the popular 16/13:1 variable ratio power gearbox.  Those that came with 20:1 ratios, turn a full 4 to 4.25 turns lock to lock.  The cars with 16/13:1 ratios turned from 3.50 turns lock to lock to 3 turns lock to lock.


How many turns, lock to lock, will I have if I have the "fast ratio" conversion done to my car or truck?

Generally, depending on the car’s need for internal stops, between 2.5 to 3 turns (lock to lock).  Light trucks will generally be from 3.25 to 3.5 turns lock to lock with a 16/13:1 conversion. Late model light trucks through 1989 & later will be 3 turns or a little less.

Will I lose my turning radius?

No, the installation of our “fast ratio” conversion WILL NOT decrease your turning radius. And rebuilding your gearbox ensures you get the stops designed for your vehicle. Many of our customers have purchased gearboxes "off-the-shelf" only to find they can no longer park the car easily, because the box has the wrong internal stops for their car. 


Should I replace my power steering pump & hoses?

This depends.  If your power steering pump is leaking or more than 10 years old, we recommend rebuilding your current power steering pump.  The hoses should be replaced if they are brittle, leaking or are more than 10 years old.  I rebuild power steering pumps and can supply you with some new power steering hoses.


Can I have the conversion on my original gearbox and have it returned to me?

Yes, that's how we operate, we rebuild our customer's units. Many of our customers prefer to keep their vehicle original.  In many cases, your factory core can be made better than new.  Plus, using your core ensures the factory stops are proper for your application and the hose fittings and input shaft remain the same. If you would like to send your original gearbox to us, please see our shipping guide. Once your original gearbox is disassembled, we will do a detailed inspection to confirm it’s re-buildable.  Most gearboxes that are full of oil are rebuildable , however if water has entered the system, corrosion can turn it into a "boat anchor." If its not rebuildable, we can provide parts to match the factory setup of your gearbox, with the proper stops. 


What is the difference between rebuilt and remanufactured?

The terms rebuilt and remanufactured are used to describe how a rebuilder or manufacturer wishes to present their product and are basically synonymous. Because there is no industry standard that sets parameters for what constitutes rebuilt or remanufactured products, rebuilders must only differentiate their products from new products by labeling them as rebuilt or remanufactured. Customers should ask a supplier of remanufactured products what they do to rebuild their products so they will know what they are receiving for their money.


Can I take a power steering gearbox from a late-model Camaro or Firebird and make it work on my Chevelle, GTO, 442 or GS?

There are several things to consider before attempting this swap:

  • The Camaro/Firebird gearboxes have internal stops built into the gearbox to limit the amount of swing for the pitman arm (“F” bodies do not need as much swing as “A” bodies). If you install an “F” body gearbox on your “A” body without removing the internal stops, the turning radius of your car will be reduced and you will have a hard time making U-turns or parking.

  • If a late model (1980 and up) gearbox is used, the flex coupling will need to be changed because it is smaller in diameter than the early models.

  • The power steering pump pressure and return lines must be changed, since the late model gearboxes are metric and the early models are SAE. In addition, the pressure fitting on the back of the power steering pump will need to be changed to metric.


What do I have to change if you convert my gearbox to quick ratio?

NOTHING! Just remove the gearbox and ship it with or without the pitman arm attached and it  will be converted and shipped back to you ready to install.


Can you convert my full-size GM car gearbox to a faster ratio? 

Yes, however some can require a housing replacement. The replacement housing will be 100% drop-in compatible at installation, the differences are internal. This will add to the cost. Call us if you want to learn more. 



PowerSteering.com warrants all power steering products remanufactured by PowerSteering.com to be free of defects in materials and workmanship as long as the original purchaser owns the vehicle and the component was installed to factory specifications (excluding commercial vehicles*). PowerSteering.com  agrees to repair or replace (at their discretion) any remanufactured unit or component that fails due to material or workmanship.  

This warranty does not apply to units or components that fail due to installer and/or operator negligence, accidents, alterations of factory specifications, changes in adjustments, disassembly, inappropriate installation or failure to flush the power steering system prior to installation.

PowerSteeringcom will not pay labor claims, shipping charges, or claims of compensated damages. Warranty claims must be accompanied by a copy of the receipt.

*Commercial vehicle units are warranted for a period of 12 months with the same stipulations as non-commercial vehicles.