gear specs
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gear specs
i am putting new ring and pinions in my bronco. dana 30 front, 9" rear. i am having trouble finding set up specs. i need pinion depth, backlash etc. is there a tech sheet i can access? thanks
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Joined: Dec 2002
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From: Southern Oregon USA
Dana 30
pinion bearing preload- new 12-15 in/ lbs
used 6-8 in/ lbs
backlash- .006-.010"
ring gear torque- 55 ft/ lbs
carrier bearing cap torque 60 ft/lbs
9"
pinon bearing preload- new 13-15 in/lbs
used 6-8 in/lbs
backlash- .006-.010"
ring gear torque- 70 ft/lbs
carrier bearing cap torque- 60 ft/lbs
Starting shim stack calculations
If you are just changing the gears or if you are replacing the carrier and re-using the old gears, the quickest method is to simply start with new shims equal to the old shim stacks. You should measure each shim individually when calculating the old and assembling the new shim stacks, as measuring a stack of shims together can lead to inaccuracies. Note that any slingers or baffles (i.e. part numbers 2 and 6 in Figure 9) form part of the inner pinion shim stack. This means that if you are re-using gears that had a slinger or baffle (or both), but you aren't re-using the slinger and/or baffle, you must add the thickness of the deleted slinger/baffle to the starting inner pinion shim stack. The same is true in reverse. If you are using a slinger and/or baffle with a set of gears that didn't use them originally, you must delete the thickness of the newly added slinger/baffle from the starting inner pinion shim stack.
If both the old and new pinions have checking distance markings (aka depth codes), the starting point for the new inner pinion shim stack can be further refined as follows:
calculate the size of the old shim stack.
calculate the adjustment by subtracting the new pinion marking from the old, being careful to observe the signs. For example, if the old pinion marking is (+4) and the new pinion marking is (-2) the result will be (4)-(-2) = (4)+(2)=(6). If the old number was (0) and the new number (+2), the result would be (0)-(2)=(-2).
If the adjustment figure is negative, subtract that many thousandths of an inch from the shim stack and if the adjustment number is positive, add that that many thousandths of an inch to the shim stack.
Example: old shim stack = 0.035” (35 thou), old pinion marking is (-2), new pinion marking is (+1). Adjustment =(-2)-(1)=(-3). New shim stack will be (35)-(3)=32 thou.
Jason
pinion bearing preload- new 12-15 in/ lbs
used 6-8 in/ lbs
backlash- .006-.010"
ring gear torque- 55 ft/ lbs
carrier bearing cap torque 60 ft/lbs
9"
pinon bearing preload- new 13-15 in/lbs
used 6-8 in/lbs
backlash- .006-.010"
ring gear torque- 70 ft/lbs
carrier bearing cap torque- 60 ft/lbs
Starting shim stack calculations
If you are just changing the gears or if you are replacing the carrier and re-using the old gears, the quickest method is to simply start with new shims equal to the old shim stacks. You should measure each shim individually when calculating the old and assembling the new shim stacks, as measuring a stack of shims together can lead to inaccuracies. Note that any slingers or baffles (i.e. part numbers 2 and 6 in Figure 9) form part of the inner pinion shim stack. This means that if you are re-using gears that had a slinger or baffle (or both), but you aren't re-using the slinger and/or baffle, you must add the thickness of the deleted slinger/baffle to the starting inner pinion shim stack. The same is true in reverse. If you are using a slinger and/or baffle with a set of gears that didn't use them originally, you must delete the thickness of the newly added slinger/baffle from the starting inner pinion shim stack.
If both the old and new pinions have checking distance markings (aka depth codes), the starting point for the new inner pinion shim stack can be further refined as follows:
calculate the size of the old shim stack.
calculate the adjustment by subtracting the new pinion marking from the old, being careful to observe the signs. For example, if the old pinion marking is (+4) and the new pinion marking is (-2) the result will be (4)-(-2) = (4)+(2)=(6). If the old number was (0) and the new number (+2), the result would be (0)-(2)=(-2).
If the adjustment figure is negative, subtract that many thousandths of an inch from the shim stack and if the adjustment number is positive, add that that many thousandths of an inch to the shim stack.
Example: old shim stack = 0.035” (35 thou), old pinion marking is (-2), new pinion marking is (+1). Adjustment =(-2)-(1)=(-3). New shim stack will be (35)-(3)=32 thou.
Jason
