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Discussion Starter #1
Curious if anybody has measured differential pinion depth? What did you use to measure it?Don't want to spend a lot for measuring tool. Maybe make a tool using depth mic.
Have everything else I need to set- up new gearing for my differentials.
 
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Discussion Starter #2
I figured out how I am going to do it.Just need to make the tool.
The pinion gear is marked 1.570, that is the depth I need to be able to measure.
I think I pretty much have everything to do the job.
 
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What did you end up doing? Have you found any other info? I have experience setting up ford 8.8" differentials using Ford's pinion depth tool but I'm not sure how to properly do it on Nissan differentials.
 

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Discussion Starter #4
Still have not started on the differential. Still plan on making a tool that will line up to the centerline of the axle tube. I will use a Depth mic to measure the pinion depth. Don't think it will be a problem.
 

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Still have not started on the differential. Still plan on making a tool that will line up to the centerline of the axle tube. I will use a Depth mic to measure the pinion depth. Don't think it will be a problem.


The Ford tools have a solid cylinder that is machines to the o.d. of the carrier bearing races that you install in place of the carrier and bearings. There is another tool that installs in place of the pinion gear and you slide different shims between the two (like using the shims as feeler gauges) until you find the right shim. It could be done as you said by having flats machines onto two sides of the cylinder and a hole for the depth mic to insert through. I don't have access to a machine shop but I think there could be a small market for these.


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Discussion Starter #6 (Edited)
The market would be too small to be profitable. How many people here on this site would even attempt to do their own differentials?Not just the ability but having the equipment. Not many people even know how to read a depth mic.
Anybody with these skills such as yourself would be able to figure it out.
Compared to what I did in my 30 plus years as a machinist(also spacecraft assembly, intergration and test, tooling, composites etc.)
like I said it should not be a problem.
 
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Is the pinon depth a trial and error thing. Install initially by a measured depth, then paint the gear teeth. Run. Look at pattern in the paint. Pull pinon, add or subtract shims. Rinse repeat till pattern in paint is right.

I remember helping a friend set up gears in his truck. What a PITA operation that took several nights.
 

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Is the pinon depth a trial and error thing. Install initially by a measured depth, then paint the gear teeth. Run. Look at pattern in the paint. Pull pinon, add or subtract shims. Rinse repeat till pattern in paint is right.

I remember helping a friend set up gears in his truck. What a PITA operation that took several nights.


I believe that's the way most DIYers do it and there's nothing wrong with it except for the time involved. If you have a proper way to measure pinion depth, it is a much quicker process and the only PITA is crushing the crush sleeve, especially if you're working under the vehicle on jack stands and don't have a real strong impact wrench.


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Discussion Starter #9
The pinion depth alone will not give the correct lash.
Side bearing adjustment also must be accounted for.
When I installed the "Trutrac" the pinion depth remained unchanged but still had to adjust the side bearings.
 

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The pinion depth alone will not give the correct lash.

Side bearing adjustment also must be accounted for.

When I installed the "Trutrac" the pinion depth remained unchanged but still had to adjust the side bearings.


Yes but backlash can be measured, as shown in your post, with a dial indicator. Dial indicators are more available than pinion depth tools, especially oem pinion depth tools.


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Discussion Starter #11 (Edited)
There are multiple ways to take measurements.
I dealt with close tolerances everyday.
Deltronic pins, tooling balls, sine plates,gage blocks etc.
Differential measurements compared to machineing / assembling a Titanium hinge for a solar array is nothing.
There are NO OEM tools when dealing with spacecraft. We make them.
I am not bragging, just telling the truth.
By the way,dial indicators were not accurate enough.
 

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Discussion Starter #12
I might add, a whole lot of geometry and trigonometry.
 
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