Classic Mustangs (Tech)Technical discussions about the Mustangs of yester-year.
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Let me pose my rearend question in a different manner in the hopes of getting some feedback. I purchased a new center section, with new tracloc, and ring/pinion and dropped it in my coupe just before I started my restoration. I checked the lapping they had done and the pinion was centered on the ring, as should be. I dropped it in, broke it in, all was good. Noticed after roughly 200-300 miles I had a subtle whine, and eventually a clunk coming from the rear. The car has sat being restored for the last 2 yrs or so, no miles. Was under the car resetting driveline angle (dropped suspension) last week and turned the driveline by hand, noticed more play than the expected .0008-12 backlash. So...... I suspect the extra play has come from the bearings seating, and being broken in. I'd like to pull the center section and recheck backlash, to insure nothing is damaged. I have the dial indicators and tools to do this work, but have never worked on a rear end. Doesn't seem difficult, and don't intend to break the unit down, just double check side load followed by another lapping to check ring/pinion mesh. Have any of you done this with positive results?
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Prolly the pinion nut coming loose. Or not properly tightening to begin with. If a bearing collar or race wasn't completely seated, once everything settles you lose preload on the pinion bearings and the pinion gear ***** to an angle under load.
Who cares how much horsepower it has, all that matters is how fast it goes!
Untested 331, lots of suspension, chewing up corners.
To answer the question. Yes, pull it out and take a look. You could possibly re-torque the pinion nut if it has a shim set and not a crush collar. If you find that it was wearing in a bad way, then take it in. Or try it yourself. I learned a lot by doing my own rear end work, especially how to lock up the rear by over torquing the pinion pre-load.
I took my rear in to be set up the second time around and then realized I shouldnt have skimped on my gear selection, cheap gears meant whining gears for me.
Take a look at it.
69 Grande' 351W/AOD Performer Intake/Cam, 670 Holley Avenger, Hooker Headers, 3.70 9"TracLoc
67 Fastback A Code: 64k Miles, all original project for the wife.
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