shudder from back end dureing slow left turns - FordTough.ca - Home of Canadian Ford Truck Enthusiasts
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post #1 of 13 (permalink) Old 04-06-2015, 11:15 AM Thread Starter
 
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shudder from back end dureing slow left turns

title pretty much sums up the issue

low speed left turns I get a shudder like something is grabing or binding

turning left from a stop or almost stop - turning left as I go through a drivethrough driveway etc

almost feels like I'm pushing the right front tire sideways across the ground without it turning - it's that choppie feeling - but I'm absolutely sure it's comeing from the back axle - maybe the left side (where I had the axle seal fail last september???)

truck is an 01 with rear disc brakes and limited slip diff -I'm thinking I'm feeling the caliper grab or bind on the rotor as the axle flops about as the truck is changeing direction
- and maybe the axle is a little slow keepin up

I'm hopeing it's not the diff failing to let the wheels turn different speeds or grinding , binding and locking / unlocking

-what do these diffs do as ther start to fail? just to be sure - I haven't had to fix that .. yet on this truck lol

- has 316 000 km's on it just now

ever since I first drove this truck back in the summer of 02 I noted a strange disconnect / connect feeling come from the back axle when makeing slow speed left turns

it's this sensation that's become much much stronger I think - AND that's what makes me worry it's the diff

any input is welcome - usefull input more so
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post #2 of 13 (permalink) Old 04-06-2015, 09:53 PM
 
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It could need more of the friction modifier added into the rear diff. My grandfathers gm did the same thing. Poured a container of it in and fixed the issue. If its not in the gear oil it doesn't let the L/S plates slip they just bind.(from what I was told)

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post #3 of 13 (permalink) Old 04-06-2015, 10:30 PM
 
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Sounds about right. Won't hurt to try it.

Such is life. Just passing through.

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post #4 of 13 (permalink) Old 04-07-2015, 05:52 AM
 
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Yup, a can of friction modifier is cheaper then a $700.00 repair bill re: the clutch packs.

Press on regardless!
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post #5 of 13 (permalink) Old 04-07-2015, 06:35 AM
 
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Change the rear diff oil to a synth oil with modifier in it.

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post #6 of 13 (permalink) Old 04-07-2015, 10:06 AM
 
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sounds like clutch packs. just had it happen in my '10. change the rear diff fluid, add a container of the friction modifier. for some reason, I had to add a second container. first one dint seem to fix the problem. been good since I added the second. and at ~$5 from the dealer its the cheapest/easiest place to start.
some people say to drive slowly in circles after you add it to help it work its way into the clutch packs. cant hurt? may get dizzy...
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post #7 of 13 (permalink) Old 04-07-2015, 12:27 PM Thread Starter
 
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thanks guys
I've been kinda wondering if , IF I even have any of the friction modifyer in the diff fluid

since I had the axle seal leak like mad back in september , and had the diff cover replaced a couple of years ago - it's very possiable it has none or not enough

good first try - fix in a bottle - only slightly less perfect than things that simply fix themselves

speaking of which it didn't do any shuddering last night or yesterday - same drive through too
(prob means it's seconds from total destruction lol)
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post #8 of 13 (permalink) Old 04-07-2015, 12:46 PM
 
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Quote:
Originally Posted by 5pointslow View Post
sounds like clutch packs. just had it happen in my '10. change the rear diff fluid, add a container of the friction modifier. for some reason, I had to add a second container. first one dint seem to fix the problem. been good since I added the second. and at ~$5 from the dealer its the cheapest/easiest place to start.
some people say to drive slowly in circles after you add it to help it work its way into the clutch packs. cant hurt? may get dizzy...
Figure 8's not circles. Gotta work it in on both sides.

Start with 2oz (half a bottle) of friction modifier. Work it in. If it continues add the other half. 4oz should treat up to 3L.

Except for Motorcraft, most companies already put some modifier in the lube.

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post #9 of 13 (permalink) Old 04-07-2015, 12:52 PM Thread Starter
 
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thanks - I'll go over and see about getting some this aft
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post #10 of 13 (permalink) Old 04-08-2015, 09:48 AM
 
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Quote:
Originally Posted by Canadian Bacon View Post
Figure 8's not circles. Gotta work it in on both sides.

Start with 2oz (half a bottle) of friction modifier. Work it in. If it continues add the other half. 4oz should treat up to 3L.

Except for Motorcraft, most companies already put some modifier in the lube.
same difference but I did about 10 circles clockwise and then 10 circles counter clockwise.
country boy, winter, it was easier to find a space to do that than enough room to do figure eights. i'm sure either will work if you have the space.
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