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Old 05-03-2005, 04:28   #1 (permalink)
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BA DIFF Backlash

Hi Guys

Anyone have the factory specs for the backlash in BA GT diff.

Thanks Brett
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Old 05-03-2005, 14:29   #2 (permalink)
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Re: BA DIFF Backlash

Not sure on what Ford call acceptable, but you need to isolate the backlash from across the half shaft CV joints to measure the crown wheel/pinion backlash correctly.
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Old 05-03-2005, 14:55   #3 (permalink)
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Re: BA DIFF Backlash

Excuse my ignorance ,but what actually is diff backlash.?
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Old 05-04-2005, 03:55   #4 (permalink)
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Re: BA DIFF Backlash

Quote:
Originally Posted by CLARKEY
Excuse my ignorance ,but what actually is diff backlash.?
Backlash in basically any assembly is the amount of overall movement in one member, ie pinion, before contact (and then movement) occurs in the next member in the system, ie crown wheel. Most 7.5" to 9" crown wheels have between 3 and 14 thou backlash measured at the crown wheel. Not enough, they will whine and suffer damage, particularly when hot. Too much and they will clunk, and suffer excessive wear in on/off applications.
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Old 05-04-2005, 04:00   #5 (permalink)
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Re: BA DIFF Backlash

Quote:
Originally Posted by CLARKEY
Excuse my ignorance ,but what actually is diff backlash.?

It is the clearance between the ring gear and the pinnion gear. If you rock the ring gear back and forth you will feel a amount of movement before it stops against the next tooth. You can measure this amount with a dial indicator and magnetic base. To give you an idea of the actual backlash needed; a 9" needs 0.2 to 0.3mm.
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Old 05-04-2005, 05:04   #6 (permalink)
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Re: BA DIFF Backlash

ok besides the whine ,what other noises does it make.
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Old 05-04-2005, 05:28   #7 (permalink)
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Re: BA DIFF Backlash

Quote:
Originally Posted by CLARKEY
ok besides the whine ,what other noises does it make.
Hi Guys te info is great, but I want to Know the factory specs?

Brett
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