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Old 02-21-2015, 09:05 PM   #1
pbp1
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Default Re: Ring and pinion set up question

Moving the pinion in or out will not change the contact pattern from heel to toe, it will only move the pattern deeper into the root of the teeth or out toward the top edge of the tooth. Heel to toe is mostly affected by the cut of the gear and the alignment of the pinion bore machining to the carrier bearing bore. What you are looking for is the pattern to be centered between the root of the tooth and the edge of the tooth with a rounded edge on the pattern and not a pointed edge on the pattern.
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Old 02-21-2015, 09:30 PM   #2
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Default Re: Ring and pinion set up question

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Moving the pinion in or out will not change the contact pattern from heel to toe, it will only move the pattern deeper into the root of the teeth or out toward the top edge of the tooth. Heel to toe is mostly affected by the cut of the gear and the alignment of the pinion bore machining to the carrier bearing bore. What you are looking for is the pattern to be centered between the root of the tooth and the edge of the tooth with a rounded edge on the pattern and not a pointed edge on the pattern.
The pattern does come to a point at the root side of the tooth. Not at all bullet shaped. I did increase the pinion shim to .022. It was .018, not .016. How do I get rid of the sharp point? Back lash is set at .008-.010. The ring gear is marked .008 from Motive.
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Old 02-21-2015, 09:35 PM   #3
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Default Re: Ring and pinion set up question

Dana, The Strange housing could indeed require a different shim. The above posted suggestions were for a factory GM housing.

You can search the web, even Youtube, for "rear gear setup patterns" might find some help.

Also, consider talking with Strange about a suggested shim thickness.

Did the housing have a gear set? If so, the original shim would be a good starting point.
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Old 02-21-2015, 11:26 PM   #4
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Default Re: Ring and pinion set up question

Gear sets typically come with an instruction sheet, with pictures of example patterns, and what is required to correct them. I would never do one without my old Zoom "gear setter", for measuring pinion depth. Puts them dead nuts. Good investment imho.
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Old 02-21-2015, 11:47 PM   #5
Dana Fitzpatrick
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Default Re: Ring and pinion set up question

Looking at the Richmond instructions, it looks as though I have low tooth contact.According to the instructions, this is solved by increasing the pinion cone setting. Does this sound like I need to decrease the pinion shim thickness?
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Old 02-21-2015, 11:55 PM   #6
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Default Re: Ring and pinion set up question

You mean Pinion Depth? i've never heard the term Pinion Cone. More shim puts it deeper. I have never seen one require a shim as thin as you mentioned. I can't remember ever using a shim thinner than .028". As has been mentioned, .030" to .033" is very common.
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Old 02-22-2015, 12:17 AM   #7
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Default Re: Ring and pinion set up question

Try a 0.035" shim between the pinion gear and the pinion, and 0.008" to 0.010" back lash, as measured at the outside end of the ring gear teeth, measured 4-8 places around the ring gear. Make sure you're measuring the back lash with the dial indicator as close to perpendicular to the rotation of the gear as possible.
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Old 02-23-2015, 01:24 AM   #8
pbp1
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Default Re: Ring and pinion set up question

If the pattern comes to a point on the root side, you need to pull the pinion farther away from the ring gear, which in this case would mean removing some pinion shim. That being said, removing shim would move you outside the normal range on shim. I would make sure that the inner pinion race is fully seated in the housing bore as this would give you a false reading.
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