TM Contents - Richmond Gear

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Ring and Pinion

Contents

PAGE FAQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Gear Ratio Selector . . . . . . . . . . . . . . . . . . . . . . . . . 3 Installation Instructions . . . . . . . . . . . . . . . . . . . . . . . 4

Chrysler 8.25 & 8.375 . . . . . . . . . . . . . . . . . . . . . . . 6 Chrysler 9.25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Ford 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Ford 8.8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Ford 9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

GM 7.5 & 7.625 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 GM 8.2 Drop Out (Early) . . . . . . . . . . . . . . . . . . . . . 12 GM 8.2 (65-72) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 GM 8.5 & 8.625 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 GM 8.875 Truck . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 GM 8.875 "C" Axle, Car . . . . . . . . . . . . . . . . . . . . . . 16 GM 10.5, 4 Bolt . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Toyota 8 {7.8} . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Complete Kits and Mega Kits . . . . . . . . . . . . . . . . . 19 Half Kits and Indidvidual Components . . . . . . . . . . . 20 Full Spool Kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Mini Spools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Purpse Built Products . . . . . . . . . . . . . . . . . . . . . . . 23

Powertrax Full Lockers . . . . . . . . . . . . . . . . . . . . . . 24

Warnings and Cautions . . . . . . . . . . . . . . . . . . . . . . 30 Terms and Conditions of Sales . . . . . . . . . . . . . . . . 31

TM

Phone: 864-843-9231 ? Fax: 864-843-2964 ? 1

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TM

Ring and Pinion Sets

FAQ

To get your Ring & Pinion technical questions answered quickly and accurately, have the following information ready when you call Richmond Gear Technical Assistance (864-843-9275):

Year Make (Chevy, Jeep, Ford, Dodge, etc.)

Model (1 / 2 ton, Impala, etc.) Vehicle weight (lbs.) Transmission brake Drag race only Street and drag race Street only

Circle/Oval track racing Current gear ratio

New ratio you are considering? How will you use the vehicle? Tire size (diameter) inches.

Number of cover bolts; or is it a drop out? Number of ring gear bolts.

Transmission (manual or automatic) Engine size (cu. in.), horsepower and torque if known.

Current RPM's at your normal cruising speed. Standard or reverse rotation for front ring & pinion. Reverse rotation ring and pinion; the pinion shaft enters the housing above the axle centerline. Standard rotation ring and pinion; the pinion shaft enters the housing below the axle centerline. Independent Front Suspension (IFS) or solid straight axle in front. If you pull a trailer with your vehicle, what is the loaded trailer weight?

( ) YES ( ) NO ( ) YES ( ) NO ( ) YES ( ) NO ( ) YES ( ) NO ( ) YES ( ) NO

1. Does Richmond make a gear set for my car or truck? Specified in catalog for most applications. Call Richmond Tech Line on some applications.

2. What ratios does Richmond make for my car or truck? Specified in catalog. Also see the Richmond Double Diamond catalog for more ratios.

3. Will your gear set fit my carrier? Need to know what carrier and/or ring & pinion and what ratio came from the factory.

4. What part number do I need for my application? Specified in catalog. Also see the Richmond Double Diamond catalog for more ratios.

5. Have a number off either ring gear or pinion but not part number? Call Richmond Tech Line. The numbers that are on the ring gear and pinion are manufacturing numbers. Richmond can cross-reference for you.

6. Have the numbers off tag on rear housing. What rear end ratio do I have? Call Richmond Tech Line. You can identify most Ford and Dana from tag. Richmond can identify Dana from number on gear.

7. Do I need a street gear or a pro gear? Pro Gears are for drag racing only. Pro Gear or Street Gear selection will depend on the car weight, horsepower, tire size, and type of transmission. If the car weighs 2,800 lbs. or more and has a trans brake and high horsepower, a Pro Gear is recommended.

8. Can I set up my own rear? Yes. Recommend the purchase of Richmond Installation DVD. DVD covers basic set up for applications in catalog.

9. What is the best ratio for my car? Need to determine use, tire size, tranmission, etc. and how you want to drive the vehicle. Do RPM calculations. Visist and use the "GEAR CALCULATOR."

TM

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Phone: 864-843-9231 ? Fax: 864-843-2964 ?

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TM

Ring and Pinion Sets

Choose The Gear Ratio That Is Best For Your Vehicle

When selecting a Gear Ratio, you should consider the following:

1. Tire Size 2. Transmission Ratio 3. Final Gear Ratio 4. Engine RPM at Cruise Speed

The following formula has been developed to calculate the optimum final Gear Ratio to suit your application.

_M_._P_.H__. _X_G__e_a_r_R_a_t_io_ X 336 = RPM ___________ Tire Diameter

The chart shown below shows RPM calculations at 55 MPH for various combinations of final Gear Ratio and Tire Diameter. Gear Calculator is available on RICHMOND website

Tire Diameter Gear Ratio 24 25 26 27 28 29 30 31 32 33 34 35 36 38 40 42 44

2.56

1972 1892 1820 1752 1690 1631 1577 1526 1478 1434 1391 1352 1314 1245 1183 1126 1075

2.73

2102 2018 1940 1869 1802 1740 1682 1627 1577 1529 1484 1441 1401 1328 1261 1201 1147

2.94

2264 2173 2090 2012 1942 1874 1811 1753 1698 1646 1599 1552 1509 1429 1358 1294 1235

3.08

2372 2277 2189 2108 2033 1963 1897 1836 1779 1725 1674 1626 1581 1498 1423 1355 1294

3.21

2472 2373 2282 2197 2119 2046 1977 1914 1854 1798 1745 1695 1648 1561 1483 1412 1348

3.31

2549 2447 2353 2266 2185 2110 2039 1973 1912 1854 1799 1748 1699 1610 1529 1456 1390

3.42

2633 2528 2303 2341 2257 2179 2107 2039 1975 1915 1859 1806 1756 1663 1580 1505 1436

3.54

2726 2617 2516 2423 2336 2256 2181 2110 2044 1982 1924 1869 1817 1772 1635 1558 1487

3.73

2872 2757 2651 2553 2462 2377 2298 2224 2154 2089 2027 1969 1915 1814 1723 1641 1567

3.90

3003 2883 2772 2669 2574 2485 2402 2325 2252 2184 2120 2059 2002 1897 1802 1716 1638

4.10

3157 3031 2914 2806 2706 2613 2526 2444 2368 2296 2228 2165 2105 1994 1894 1804 1722

4.27

3288 3156 3035 2923 2818 2721 2630 2545 2466 2391 2321 2255 2192 2077 1973 1879 1793

4.56

3511 3371 3291 3121 3010 2906 2809 2718 2633 2554 2478 2408 2341 2218 2107 2006 1915

4.88

3758 3607 3469 3340 3221 3110 3006 2909 2818 2733 2652 2577 2505 2373 2255 2147 2050

5.29

4073 3910 3760 3621 3491 3371 3259 3154 3055 2962 2875 2793 2716 2573 2444 2328 2222

5.38

4143 3977 3824 3682 3551 3428 3314 3207 3107 3013 2924 2841 2762 2616 2486 2367 2260

5.71

4397 4221 4058 3908 3769 3639 3517 3404 3298 3198 3104 3015 2931 2777 2638 2512 2398

6.17

4751 4561 4385 4223 4072 3932 3801 3678 3563 3455 3354 3258 3167 3001 2851 2715 2591

7.17

5521 5300 5096 4907 4732 4569 4417 4274 4141 4015 3897 3786 3681 3487 3313 3155 3011

How To Choose The Gear Ratio Based On Speed

When selecting a Gear Ratio, you need the following information:

1. Tire Size (diameter) 2. Final Transmission Ratio 3. Engine RPM at Cruise Speed

Formula to calculate Gear Ratio based on speed

R__P_M__X__T_ir_e_D__ia_m_e_t_e_r = Ratio ___________ MPH X 336

Example: If you want to Cruise at 60 MPH at 2000 RPM and your Tire Diameter is 30", the Gear Ratio you

need is a 3.00

_2_0_0_0__R_P_M__X__3_0_"_T_i_re__D_ia_._

= 3.00

60 MPH X 336

TM

Phone: 864-843-9231 ? Fax: 864-843-2964 ? 3

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Ring and Pinion Sets

Installation Instructions

All sets are matched pairs and identified by matching numbers on the ring gear and the pinion. Make sure you have a matched set.

Clean all parts before you start the assembly.

Examine all components and remove any burrs, nicks or sharp edges that could cause components not to seat properly.

CHECKING BACKLASH

It is suggested you set backlash to .008 ? .010 inch (see illustration).

Backlash is the free movement of the ring gear with the pinion held fixed in place.

Correct backlash is obtained by shimming or adjusting the ring gear away from or closer to the pinion.

Pinion bearing preload should be approximately 15 in.-lbs. of rotating torque if you are reusing the bearings. If you are installing new bearings you should obtain 25 in.-lbs. of rotating torque. This is accomplished by a preload shim pack (of various thicknesses) or a crush sleeve. When final assembly is being made, you should use a new crush sleeve. See page19 for Installation Kits.

Correct pinion position is obtained by shimming the pinion in or out to obtain the correct tooth pattern. All housings are not shimmed in the same location, but shimming still moves the pinion in or out. For most housings, the shim is located between the pinion teeth and the pinion head bearing. It is suggested that you start with the same shim thickness on the new gear set that was used on the old gear set.

OBTAINING PROPER GEAR PATTERN

Paint the ring gear teeth with a marking compound on both the Drive and Coast side. Richmond part #55-0001-1.

Rotate ring gear several revolutions in both directions while resistance is being applied to the pinion to imprint the pattern on the gear teeth.

TM

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Phone: 864-843-9231 ? Fax: 864-843-2964 ?

EL TM

TM

Ring and Pinion Sets

Installation Instructions

PATTERN INTERPRETATION (RING GEAR) Figure 1: Pinion is normal or has desirable pattern. The Drive

pattern should be centered on the tooth or slightly toward the toe. The Coast pattern should be centered on the tooth, but may be slightly toward the toe. There should be some clearance between the pattern and the top of the Fig. 1 tooth. Figure 2: Pinion is too deep. Move pinion away from gear centerline. Figure 3: Pinion is too shallow. Move pinion toward centerline of gear.

PATTERN MOVEMENTS SUMMARIZED

Fig. 2

1. Decreasing backlash moves the ring gear closer to the pinion.

2. Increasing backlash moves the ring gear away from the

pinion.

3. Deep pinion position, with correct backlash, moves the pinion

closer to the ring gear. Drive Pattern moves deeper on the tooth (flank contact) and slightly toward the toe. Coast Fig. 3

pattern moves deeper on the tooth and toward the heel.

4. Shallow pinion position, with correct backlash, moves the pinion further from the ring gear. Drive

pattern moves toward the top of the tooth (face contact) and toward the heel. Coast pattern

moves toward the top of the tooth and slightly toward the toe.

FASTENER TORQUE SPECIFICATIONS ? Ring Gear Bolts

3/8" All 45-50 ft-lb 7/16" All 60-65 ft-lb

? Carrier Cap Bolts 7/16" (5/8" head) 60-65 ft-lb 1/2" (3/4" head) 80-85 ft-lb

LUBE

1/2" All 100-110 ft-lb

Fill gear case with sufficient amount of Richmond Gear Lube (part # LUBE ), and maintain the

proper level at all times. Proper maintenance is a must to protect your safety and working life of your

gear set. NOTE: For oval track racing, add 2 to 3 additional pints gear lube.

BREAK IN PROCEDURE All ring and pinion sets require a brief break-in period to ensure long life and quiet operation. The following break-in procedure is recommended before heavy load and constant usage. 1. Bring axle to normal operating temperature by driving vehicle for approximately 15 to 20 miles.

Do not create any shock loads. Do not tow or carry a load with the vehicle. 2. Let the axle assembly cool completely. Do this 2 ?3 times. 3. For the next 200 miles of operation, drive gently, without any heavy loads. 4. For trailer towing, an additional cycle of 15 to 20 miles break-in is required with the trailer after

step #3. This is important! To properly break in a new gear set, 200-300 miles of normal driving is recommended before constant towing.

IF THIS PROCEDURE IS NOT FOLLOWED, OVERHEATING AND EVENTUAL GEAR AND/OR BEARING FAILURE MAY RESULT.

TM

Phone: 864-843-9231 ? Fax: 864-843-2964 ? 5

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