Need help reading ring and pinion pattern - Page 2 - Vintage Mustang Forums
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post #16 of 22 (permalink) Old 09-04-2016, 10:43 PM
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You mean a new DIFFERENTIAL, not a carrier, right? Why not have the ring gear mounting flange surfaced?
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post #17 of 22 (permalink) Old 09-04-2016, 11:05 PM Thread Starter
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Quote:
Originally Posted by Woodchuck View Post
You mean a new DIFFERENTIAL, not a carrier, right?
Yes. There seems to be a lot of competing names for the same thing. Carrier - Sometimes referred to as a Differential Case or Ring Gear Carrier. This unit transfers the motion from the ring gear to the axle shafts.

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Why not have the ring gear mounting flange surfaced?
Sure ill give this a shot. Just the problem is i don't see anyone who offers this as a service and don't know the associated cost with it vs replacement.

1965 Mustang fastback - 351w (Ebrock perf 750, Ebrock perf intake Trick Flow track heats, JBA shorties), T-5z, 9in (Eaton Truetrac, 3.70)
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post #18 of 22 (permalink) Old 09-04-2016, 11:11 PM
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Any competent machine shop should be able to true it up.
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post #19 of 22 (permalink) Old 09-05-2016, 09:05 AM Thread Starter
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Quote:
Originally Posted by Woodchuck View Post
Any competent machine shop should be able to true it up.
After thinking this over i have a bad feeling about this.
We actually have 3 surfaces with runout we are dealing with:
  1. Cover to body
  2. Body to cover
  3. Body to ring gear

So even if i get the "Body to ring gear" surface trued up it will go back out of alignment if i don't keep the body and cover lined up in the same bolt holes.

1965 Mustang fastback - 351w (Ebrock perf 750, Ebrock perf intake Trick Flow track heats, JBA shorties), T-5z, 9in (Eaton Truetrac, 3.70)
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post #20 of 22 (permalink) Old 09-17-2016, 12:52 PM Thread Starter
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I have rebuilt the rear-end with a new Eaton/Detroit Truetrac Differential 913A586. It had 2 thousandths run-out on the glass table. I ended up having to buy shorter ring gear bolts when switching from the TracLok to the TrueTrac (ARP Pro Series Ring Gear Bolt Kits 250-3003). I now have 2 thousandths of run-out in the ring gear when installed in the case. I set the backlash at 8 thousandths. I need some help with the pattern again. These pictures are all with the same settings. I just varied the thickness of paint and the lighting.


Pictures here of the 9 inch pattern #2


What do you think of the pattern?
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1965 Mustang fastback - 351w (Ebrock perf 750, Ebrock perf intake Trick Flow track heats, JBA shorties), T-5z, 9in (Eaton Truetrac, 3.70)
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post #21 of 22 (permalink) Old 09-17-2016, 07:01 PM
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I think it looks good! On the other hand, I am doing this for the first time as well, so you better hope those in the know chime in!
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post #22 of 22 (permalink) Old 09-19-2016, 12:45 PM Thread Starter
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Based on this page I believe my pinion is set slightly too deep. I am going to try to remove just a little of shim and re-pattern it.

1965 Mustang fastback - 351w (Ebrock perf 750, Ebrock perf intake Trick Flow track heats, JBA shorties), T-5z, 9in (Eaton Truetrac, 3.70)
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