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Old 06-27-2020, 01:02 PM
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Ford 9 inch knocking

hey guys looking for some opinions, my rear end has developed an intermittent knocking when I let off the gass ⛽ I'm suspecting it may be pinion preload or worn gears? Is their any way I can check without pulling rear end apart as currently I don't have much space to work on the car. Garage has around 2 feet clearance in any direction when car is inside. Lol
I did try rotating the prop with trans in neutral & there is a fair amount of free play rotationly.
YouTube link to illastrate
https://youtu.be/PsOzvy39IHg

Any feedback very welcome.

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Old 06-27-2020, 01:25 PM
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play is shaft seems fine.

I would start by checking all the front and rear suspension parts for worn bushings or loose bolts.
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Old 06-27-2020, 01:32 PM
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That's maybe bordering on possibly excessive backlash in the gear set, but it is so hard to tell from the pinion side rather than the ring gear side....if it is that, it is more likely to be carrier bearings going bad rather than just gear wear.

This have a spool in it, or some sort of traction differential??

Unless run out of lube and burned up, gears rarely wear away and make a bunch of clearance....they either live just fine or it's catastrophic failure and teeth shatter.

The bummer part about a 9" Ford is you can't just pop a rear cover and take a look....you've got to pull the brakes, axles and pumpkin to see anything.

I agree with Imsport to look over rod ends and such in the suspension, brackets, stretched bolt holes, worn bolt shanks, etc.
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Old 06-27-2020, 02:02 PM
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Its a totally stock open diff with 3.0 gears , I had planned on fitting an lsd last year but shipping costs to UK along with fresh bearings etc put an end to this temporarily.
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Old 06-27-2020, 02:17 PM
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Check the pinion nut to see if it's still tight. Use a normal size 1/2 inch drive ratchet with a 1 1/16" socket on it and pull hard. If you can turn the nut then it wasn't tight enough. It's kind of common for the nut to back off and cause a lot of unwanted movement.
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Old 06-27-2020, 02:20 PM
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Many thanks, I'll take a look at both the rod ends & the pinion nut. Hopefully it's knotting to expensive as can finally get out & use the car now the lockdown is easing hear.
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Old 06-27-2020, 02:56 PM
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A $20 bore scope for your phone through the fill hole will save some effort.
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Old 06-28-2020, 01:41 PM
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Usually it's worn out universal joints in the drive shaft... they should have no slop in them... and they don't cost much for new ones...
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Old 06-28-2020, 03:12 PM
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Prop ujs are nice & tight , main 4 bar rod ends look OK also , haven't managed to check the panhard rod yet, as the mounting bolts look to have siezed, so letting some wd40 soak in currently, whilst I had a wheel off I popped a brake drum to check shoe's & noticed the backlash on half shaft sounds allot like the noise I'm hearing , this is the free play with transmission in park , presumably from side gears & pinion , sadly couldn't check the pinion yoke nut is tight as don't have a socket large enough but visually it doesn't look to have backed out.

https://youtu.be/1M5zyvLjZDA
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Old 06-28-2020, 03:20 PM
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the pinion nut is a 1 1/16"

the amount of backlash is not unusual, maybe try higher viscosity gear oil.

if the differential gear are worn you will have to take the diff out of the housing, remove the ring gear and take the diff apart to inspect.
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Old 06-28-2020, 03:22 PM
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Quote:
Originally Posted by swompz View Post
sadly couldn't check the pinion yoke nut is tight as don't have a socket large enough but visually it doesn't look to have backed out.
Yeah, Big Gear Head said 1 and 1/16"... not 11/16" if you thought that...

Tugging on the panhard bar ends should show if loose or not...

Sometimes when you drive a car long enough you start to hear every little noise and there really isn't anything wrong... I thought my GTO was falling apart but when I drove it after spending a year in Vietnam, I was amazed that it seemed totally tight and quiet!
.
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Old 06-28-2020, 03:26 PM
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Thanks imsport , will see if have a 1 1/16 at work, as only have a max of 13/16 in tool box hear . Its got 80/90 hypoid in diff at the moment, what sort of viscosity would you recommend for potentially warn gears to ease its age so to speak? Maybe 85/140 the center section came out of a galaxy 500 which clearly hadn't had any love in a very long time.
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Old 06-28-2020, 03:34 PM
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Quote:
Originally Posted by BuzzLOL View Post
Quote:
Originally Posted by swompz View Post
sadly couldn't check the pinion yoke nut is tight as don't have a socket large enough but visually it doesn't look to have backed out.
Yeah, Big Gear Head said 1 and 1/16"... not 11/16" if you thought that...

Tugging on the panhard bar ends should show if loose or not...

Sometimes when you drive a car long enough you start to hear every little noise and there really isn't anything wrong... I thought my GTO was falling apart but when I drove it after spending a year in Vietnam, I was amazed that it seemed totally tight and quiet!
.
I know exactly what you mean , I hear every bang & squeak, & don't get me started on the very quiet ticking coming from left cylinder Bank which I've never found reason for despite going through motor. Fortunately its never got worse in 8k miles, so presume its a pin hole in the header I just can't find
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Old 06-28-2020, 04:19 PM
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Get a hold on the pinion yoke and see if you can move it up and down or in and out. If there is any movement other than rotation then the nut has backed off or the pinion bearings are going bad.

As for that tick, could be a cracked spark plug or a plug wire that's got a hole or tear in it and it's arcing to the head or manifold.
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Old 06-28-2020, 04:51 PM
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Doing a lot of 1 wheel burnouts is particularly hard on spider gears & cross shaft ....
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