Drive shaft removal - struggling

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ScottR400D
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#16 "So I'm saving myself the work and a few quid on not having to replace the prop shaft bolts."

You're 'saving'about £1.50, I bought 10 M8 x 20 12.9 bolts for £3.99 delivered......

I think the key phrase here is  "don't spoil the ship for......" Wink

I would suggest that as you've been hauling on the driveshafts it would be wise to have them out and serviced, Removing the diff for the same purpose is not much extra work and well worth doing. 
 

David_Long
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Don't discount how effective the ATB can be - yes, if you go flying over kerbs it might behave a little unpredictably, but if you're not intending to drive competitively, then it's a very good solution.

 

From my blog:


The Quaife ATB is a Spur type differential. Although there’s nothing new about the design, it does offer some features that can be adapted to provide limited slip action. Rather than bevel gears, it has pinion roller gears, which would normally be mounted on bearings, but in this (ATB) design they run loose and unsupported in a carrier.
The implications of this are that the pinion and spur gear are pushed apart under torque (like any gear set). The pinion gears are then subjected to higher frictional forces against the carrier wall. By putting lots of pinion gears (12 in this design) the friction forces can be multiplied up. In essence there is a limited slip action as torque increases. To ensure there is sufficient torque to enable this process to start there is a stack of Belleville springs between the spur gears to provide some initial frictional forces between them.
The limited slip action is at a maximum when both wheels are turning together at the same speed (pinion gears are stationary). If something should happen to overwhelm the fiction and start the pinions turning then the LSD action can drop rapidly returning it to a more of an open diff mode. This is typically seen when subject to more extreme track driving where wheels become airborne over kerbs. However, limitations aside, it has a good pedigree on road cars and works well as as a fit and forget LSD solution.

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7 wonders of th...
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The Quaife is not an LSD though

56
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David that's the best explanation of the workings of the ATB that I've seen - thanks!
L66TEY
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Progress made, with the passenger side driveshaft now removed (with ease). 

On the basis of the Quaife ATB Diff being "fit and forget" I'm inclined not to remove it - adopting a "if it ain't broke, don't fix it" approach. 

Chris 

L66TEY
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Driver side Driveshaft finally removed Smile

However, it's become clear why it was a struggle to remove. 

Does this mean a new Driveshaft and/or Diff Rebuild??
I hope I'm not kidding myself but I'd like to think it's simply been caused by some crud getting stuck between the driveshaft and Diff Housing. 

As always, all feedback/input appreciated??

David_Long
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That looks a bush failure on the ATB unit I'm afraid. The shaft may clean up but I would recommend that the ATB unit is removed and checked. Cause? My money would be on prolonged donuts leading to lubrication failure on that side.  

L66TEY
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Thank you David,

Whilst not great news, appreciate your help on this. 

Just spoke to Quaife and understandably their Lifetime Warranty doesn't cover the bushes in the Ford Housing. 

Sounds like I'll need to remove the Diff after all and get this sorted.

Chris 

PS Hand on heart, Im not guilty of the suggested "donut" cause :O

David_Long
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You may be able to get an idea of the condition by comparing the two sides with a finger. The bush that i think has failed will have grooves in a helical pattern. If the grooves have been worn away then it will need attention.

L66TEY
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Hi David,
As per your suggestion I checked for the grooves and Im pleased to confirm they are intact, albeit the bush is a little pitted. 
Based on this pic - what are your thoughts?

Chris