Quote:
Originally posted by Vic Eaton
HI ALL OUT THERE
Can any one advise me on the following i have just dismantled two axles to extract the diffs i need one for the radio truck you have given me advice befor on matching diffs well all the years i have had these trucks i have never seen inside a diff as chris vickery told me , divide the teeth on the pinion gear by the teeth on the ring . fine . but all i can see is the ring gear what else do i need to dismantle to see this pinion gear .
regards vic uk.
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Hi Vic..
. Remove the old gear set and thoroughly clean both the ring gear carrier and rear end housing with solvent. After cleaning, air dry all parts.
2. Always verify that you have the correct gear ratio that you have purchased. This can be checked by dividing ring gear tooth count by the pinion tooth count. e.g. (Ring gear tooth count 35 T, pinion gear Tooth count 10 T, 35 divided by 10 = 3.50:1.
3. Many differential cases have many thousands of miles of service. Check all threads in the case for ware. It may be necessary to chase the treads to clean and align threads.
4. Check side bearing adjusters as they are often warped and out of shape making ring and pinion settings difficult. Replace as necessary.
5. Check ring gear back face for flatness. Generally after heat treating there may be a degree of taper. This may be rectified by lapping gear on sand paper on a glass flat plate. This will give you more even and uniform pattern when setting up you new gear set.
6. Careful attention should be give to blueprinting your rear end. Accurate clearancing will lead to a longer life for your unit.
7. All new parts should be thoroughly cleaned before assembly and checked for damage.
8. Examine the ring gear mounting surface for nicks or burrs which might prevent a flush mounting 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 surface imperfections. Nicks or burrs can be removed by using block-backed grit paper ora small file. Following material removal rewash in solvent and air dry. Mounting ring gear. Loctite ring gear bolts and torque to factory specifications.
9. All Motive Gear and Motive Gear Performance ring gear and pinions have been "Lapped" in sets and should never be mixed with another ring gear or pinion. Check to see serial numbers are the same on the ring gear and pinion.
10. Each motive gear and Motive Gear Performance ring gear and pinion is prerun and marked on the pinion face with its proper depth setting called the "Checking Distance". This dimension is from the face of the pinion to the axle center-line. A setting tool must be used to measure the checking distance. Pinion depth is adjustable by adding or subtracting shim thickness. Stay +/-.002 of the pinion dimension, (see Figure 'A' and 'B').
11. Once pinion depth is achieved using a new crush collar or preload shim pack set pinion bearing preload to 15 inch-pounds rotating torque with used bearings, and 25 inch pounds with new bearings. Once preload is set install the seal and loctite pinion nut.
12. Once the pinion gear is installed, position ring gear and carrier into housing to check backlash. Motive Gear and Motive Gear Performance ring gear and pinions are developed to be run at .008" to .012" back-lash for street gear sets.
13. Adjustments for backlash is done by spanner rings in the housing or shim packs behind the carrier bearing cups (GM) or cones (Dana). Always be sure carrier bearings are preloaded. The carrier should not fall out of the housing, but should have to be "tapped" in during final installation. Replace bearing caps and torque to factory specifications.
14. You are now ready to verify the tooth contact pattern. A gear marking compound should be used. Paint gear teeth with compound in several spots and rotate ring gear several revolutions. A tooth contact pattern will appear and should be similar to the pattern shown in illustration 'C'. If the pattern is not in the approximate position shown, reset pinion depth and backlash to correct pattern. Pinion shims usually must be moved in .003 of an inch increments to notice a pattern change. If a pattern is heavy toe subtract shims, (see Figure 'D') If a pattern is heavy heel add shims, (see Figure 'E').
NOTE: Reverse the procedure for 8" and 9" Ford
15. Fill the case with required amount of GL6 Torco 85W-140W with additive gear lube, and maintain the proper level at all times. Proper maintenance is a must to protect your safety and the working life of you gear set.
Go Here for the torque specs and other info..
Enjoy...
http://www.drivetrain.com/ringpinioninstal.html
Keith will have you fixing his Pentax...