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Verify Ratio Before Assembly
1. Remove the gears to be replaced and thoroughly clean both the gear carrier and housing with solvent to remove any gear/bearing residue, which could lead to abrasive failure of the new gear set. After cleaning, dry-wipe (or air-dry) all disassembled parts, housings, and covers.
2. Examine the ring gear mounting surface for nicks or burrs which might prevent total landing of the newly installed ring gear. Ring/pinion tooth depth variations can result from a ring gear that is "cocked" on its mounting surface. If a ring gear spacer is to be used, also check it for similar surface imperfections, dressing these with block backed pieces of grit paper or a small file. Following material removal (from ANY part of the assembly), bathe the pieces in the solvent and wipe or air dry.
Note: Spacers not normally recommended.
 
3. Study the illustrations provided with these instructions. Familiarize yourself with the terms "backlash" and "pinion depth" (sometimes called checking distance). Each set of gears is a matched pair which has been pre-run on a gear test machine. Consequently, the pair should never be mixed with other rings or pinions. Also, since all gear sets have been run-checked, specific settings are supplied with each ring/pinion pair. These specifications vary from set to set. Backlash settings are marked on the outside diameter face or the ring gear as follows (see illustration A): Ref: BL.008
 

, which means a backlash figure of .008 inch at the closest point. Pinion depth settings (or checking distance) are marked on the face of the pinion gear as follows (see illustration B): Ref: CD 2.799,

which means distance of 2.799 inches from centerline of the ring gear to pinion face. Dimensional variations for backlash SHOULD NOT EXCEED .004" variation.

4. When installing the pinion gear you mush check its depth in the housing as per the pinion depth dimension. Add or subtract pinion depth shims to arrive at the checking distance etched on the surface of the pinion face. (See illustration C)
5. Using a new crush collar or preload shim pack, set the pinion rotating torque to 10-15 (used bearings) 20-25 (new bearings) inch pounds. For oval track applications when not using a cooling pump, set at 16-17 inch pounds on new bearings and 10 inch pounds maximum on used bearings.
6. After correct installation of the pinion gear, position the ring gear and check for backlash. Mount a magnetic-base dial indicator on the axle housing in such a way that the indicator plunger will be moving in a line that is tangent to rotation of the ring gear. This will provide you with a backlash reading which should conform to the figure etched on the side of the ring gear. Again, maintain a tolerance of .004 variation. (Backlash is always measured in 3 or more places equally spaced around in the ring gear.) Note: For oval track racing set BL at approximately .012-.014 inches.
7. Compensation for variations in this setting can be made by side-adjustment of the ring gear. Adjusting rings or side-shim packs can be changed to bring the backlash and rotating torque figures into tolerance. (Use the same torque on gear bearings as on the pinion bearings.) You are now ready to check the tooth contact pattern to assure that no accidental departures from the factory-marked specifications have been made. Apply a thin coat of Richmond Gear compound (Part # 55-0001-1) on gear teeth for best results. Tooth contact patterns should comply with those shown below. (Note rounded or bullet nose shape at heel end of pattern on Gear drive sides.)
If the pattern is not in those approximate positions, reset the pinion depth and reset gear backlash until the patterns are closer to the above mentioned diagram. Pinion and/or gear should not be adjusted to try to achieve a deeper pattern. The length of the pattern may vary with the amount of the load applied during the check procedure.
If satisfactory pattern results cannot be obtained after a reasonable adjustment, return the gear set to Richmond Gear for evaluation. An accurate evaluation can not be obtained on a used set.
8. Fill the gear case with sufficient amount of Richmond Gear 75-140 Synthetic Gear Lube with GL6 rating (see page 4), or better and maintain the proper level at all times. Proper maintenance is a must to protect your safety and working life of you gear set. Check oil level between scheduled oil changes to insure that roper oil level is maintained. Inspect vent plug to insure it is clean and operating. Inspect oil leakage, excessive heating, or any unusual noise or vibration. Note: For oval track racing add 2-3 additional pts. gear lube.
 
FINAL RESULTS

Properly designed, manufactured, and maintained Richmond Gears, correctly assembled by you in a clean, rigid gear box, and operated with the proper lubricant, should result in safe and satisfactory performance. Be sure you select the proper application for your gear set.

BREAK IN

A new ring and pinion installation, especially a high numeric ratio with new bearings, can cause an excessive heat buildup in the rear end and cause softening of the gear teeth and bearings if a break in is not performed.

Street vehicles should be driven at normal street driving speed for approximately 10 miles, then stop and let cool for 30 minutes. Do this 2 to 3 times. Towing vehicles need approximately 200-300 miles of normal street driving before being used for towing.

On circle track race cars make approximately 6 to 8 laps at slow speed, then let cool for 30 minutes. Make 6 to 8 more laps at slow speed, then 2 to 3 laps at full speed, the let cool again for 30 minutes.

Drag cars need only an initial run-in since they are driven short distances and heat is not normally a problem with proper lube and backlash allowance.

NOTE: If after the above break in is performed, overheating of the rear end is suspected, repeat the final portion of the break in procedures.


HELPFUL HINTS & ADDITIONS TO RICHMOND GEAR INSTALLATION INSTRUCTIONS
After completely reading instructions, go back to Step #4. The following group of shim thickness are only if you do not have access to a pinion depth gauge or the old shim from the old pinion to start with. GM - .035", Ford 8"-9" - .020", Ford 8.8"-7.5" - .030", All Dana's - .035", 8 3/4" x 1 3/4" pin, - .090", 8 3/4" x 1 7/8" pin, - .020", Mopar - 9 1/4" - .020"
Pinion depth shims are located underneath the rear pinion bearing cone that is pressed on pinion with exception of the Dana Models. Dana pinion depth shims are underneath the rear pinion bearing cup in the housing. Dana carrier bearing pre-load shims are between carrier and bearing cone. All others are on the outside of bearing cup unless spanners are used as in the Ford 8 and 9 inch, both 8 3/4 and Mopar 9 1/4. Ford 8 and 9 inch pinion depth is regulated by shims between pinion support and chuck or center section.
Step #5 - If crush collar is used to set bearing pre-load, do not use until you have established pinion depth and backlash and you are satisfied with the pattern you get. You can simulate pinion bearing pre-load by tightening pinion nut until the right pre-load is achieved with only motor oil on the pinion bearings. The crush collar and pinion seal should be last to install.

Step #7 - GM rear cover style housings use shims on the outside, between bearing cup and housing, adjusting backlash and carrier bearing pre-load If starting with a bare housing, or you are installing a spool or different carrier, before you mount the ring gear, establish equal shim pack on each side of carrier and enough to create a drag when you slide it in and out of the housing by hand. Keep in mind you should keep the thickest shim next to the bearing cup. With a little loctite on the threads of the rings gear bolt, mount gear to carrier or spool. After adjusting shim pack to get proper backlash and once you have established your pattern, remove carrier and pinion. Now is the time to install crush collar and pinion seal. NOTE" Always use loctite on the pinion nut. If you do not have a rear end housing spreader, you will have to work at installing the carrier once you add more shim to pre-load the carrier bearings. As a rule of thumb all carrier bearings will require .010 pre-load After adding .005 to each side of the shim pack, coat surfaces of the shims with axle bearing grease to hold them in the housing, make sure the cups stay straight. Using a plastic or brass hammer, gently pound on bearing cups side to side until carrier has seated in housing. Again, it is important that you keep the cups straight during this operation. A spreader is almost necessary for all Dana Model rear ends. Torque caps to proper torque value.


 

 

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