Where do I find my rear end gear ratio?

You can typically find your RPO code on driver side door panel or glove box. General Motors rear end differentials are referred to by the diameter of the ring gear, i.e. 7.5 inch, 8.5 inch, 10.5 inch. Our experts will help you find the correct ring and pinion set for your particular application. Give us a call at 800-216-1632 to get started.

What kind of ring gear does a 57 rear axle have?

The 57 and later ring gear carrier has a different offset for a thicker ring gear. 55-56 rearend had one carrier for all their different ratios because the had thinner ring gears. The aftermrket ring gears are set up to fit 57 and later 899 housing carriers and also the posi housings carriers, 833 and 812.

What kind of gears does a 57 Chevy have?

The aftermrket ring gears are set up to fit 57 and later 899 housing carriers and also the posi housings carriers, 833 and 812. They have different offsets for 3 series and 4, 5 and 6 series gears. The 55-6 ring gear carrier is lighter duty also.

What was the rear axle carrier on a 1956 Chevy?

“Make sure your 3.55 rear end is not the original 55-56 rear (306 casting) if you are going to change the ring and pinion. The 57 and later ring gear carrier has a different offset for a thicker ring gear. 55-56 rearend had one carrier for all their different ratios because the had thinner ring gears.

What are the rear end gears fuel economy?

Rear End Gears Fuel Economy. This is the ratio of gears in the rearend (differential) that you may have heard of in the numerical terms 2.73 to one, 3.23 to one, 3.55 to one, 3.73 to one, and 4.10 to one (commonly written in the following manner 3.23:1 with a colon). These numbers specifically relate the ratio of the speed at which…

How can I find out what my rear end is?

Combine all of the codes, to identify ring-gear size, gear ratio, date and location of manufacture. Decode the service number by matching it to an axle service code chart, similar to those found on WoodyG.com and Drivetrain. The code chart tells the gear ratio and ring-gear size, denoting an 8- or 9-inch rear end.

What are the numbers on the rear end differential?

These numbers specifically relate the ratio of the speed at which the pinion gear rotates to that of which the larger ring gear rotates within the differential.

What’s the best way to install new gears?

Installing new gears can be a pain but by using a ring and pinion installation kit, like this one from Ratech, makes the job much easier.

Is there a calculator that calculates the transmission ratio?

This calculator will provide the speed of the vehicle based on transmission gear ratio, engine RPM, tire height, and the ring gear and pinion gear ratio in the rear end axle differential housing. This calculator assumes you know the vehicle’s transmission ratio.

How to calculate gear ratio for ring and pinion?

Use our simple Gear Ratio Calculator to quickly find the correct gear ratio for your ring and pinion gear set. Save yourself the headache and let us figure out your ring-and-pinion gear ratio! Select the value you want to solve for. For the Tire field, enter your tire diameter in inches.

Where to find Dana Spicer rear end material number?

When ordering Dana Spicer Differential Parts, provide a bill of material number. This number is stamped on the right hand side axle tube of your rear end. It’s a number like: 603XX-X, 604XX-X or 605XX-X. With this number, you can tell exactly what components the factory used in the assembly of your rear end.

When do you need a higher gear ratio?

If you’re looking for better gas mileage, you want to switch to a higher gear ratio. If your looking for more power or performance, you would switch to a lower ratio. It’s just backwards from the way we think, if you have a 4.10 ratio and need better fuel mileage you would switch to a 3.42 or 3.73 gear ratio.

What are the pros and cons of 4.88 gears?

The pros are that these gears have a stronger V6 third member (in the rear) with lower gears that are suitable for larger tires, and (most importantly) they can be had for less than a full ring and pinion install. If you have an IFS truck, you can swap in the 4.88 IFS front diff.

Can you put a 4.88 in a front axle?

If you have a solid front axle truck, you can swap in a rear diff into your front axle. The carrier is the same as any other V6 differential, so you can fit a standard locker or limited slip in the 4.88 diff. The front 7.5” IFS diff is just like any other IFS differential.

How do you remove a 4.88 gear from a car?

Use an engine hoist, chain hoist, or something else to lift the axle up and then drive out from under it. Invite a strong friend over for a beer and “remember” that you have this axle in the car to take out. Drain the gear oil and disassemble in your vehicle. Then you can pretty easily remove the lighter parts.

Is the carrier the same as a 4.88?

The carrier is the same as any other V6 differential, so you can fit a standard locker or limited slip in the 4.88 diff. The front 7.5” IFS diff is just like any other IFS differential. You can regear it at will.

Where do I find my rear end gear ratio?