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Driveline
DIY: IRS 8.8 Diff Rebuild
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<blockquote data-quote="schitzo" data-source="post: 13565637" data-attributes="member: 116059"><p>Once the desired backlash and gear pattern were obtained, I set about setting the pinion preload. Ford uses a crush sleeve to set the preload but I prefer to use a solid collar. I find it easier to setup and it maintains the preload regardless of how much power you put through the diff. </p><p></p><p>The old crush sleeve dimension provides a good starting point. Mine measured 0.4460" so I setup the solid collar as close to this dimension as possible. I managed to get it to 0.4470". The collar I used is made by Yukon and is a two piece design. Shims are placed between the two pieces and this is how the desired collar thickness is achieved. The collar is installed onto the pinion which is then installed in the housing and the pinion nut is torqued to 130 foot pounds. The pinion preload is then measured using an inch pound beam type torque wrench. The carrier is off the housing while pinion preload is measured. With the collar at 0.4470", I got a pinion preload of 17.5 inch pounds. Ford's spec is 16-29 inch pounds. </p><p></p><p><img src="http://imageshack.us/a/img845/8899/hvjv.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /> <img src="http://imageshack.us/a/img593/7237/2zj5.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>While 17.5 inch pounds is within spec, I wanted to get it a little tighter so the shim stack was decreased to give a total height of 0.4435". This gave a preload of 24 inch pounds which I like. </p><p></p><p><img src="http://imageshack.us/a/img11/1826/ftzu.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /> <img src="http://imageshack.us/a/img42/4049/1auo.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>At this point the diff is torn down in prep for final assembly. Will update tomorrow.</p></blockquote><p></p>
[QUOTE="schitzo, post: 13565637, member: 116059"] Once the desired backlash and gear pattern were obtained, I set about setting the pinion preload. Ford uses a crush sleeve to set the preload but I prefer to use a solid collar. I find it easier to setup and it maintains the preload regardless of how much power you put through the diff. The old crush sleeve dimension provides a good starting point. Mine measured 0.4460" so I setup the solid collar as close to this dimension as possible. I managed to get it to 0.4470". The collar I used is made by Yukon and is a two piece design. Shims are placed between the two pieces and this is how the desired collar thickness is achieved. The collar is installed onto the pinion which is then installed in the housing and the pinion nut is torqued to 130 foot pounds. The pinion preload is then measured using an inch pound beam type torque wrench. The carrier is off the housing while pinion preload is measured. With the collar at 0.4470", I got a pinion preload of 17.5 inch pounds. Ford's spec is 16-29 inch pounds. [img]http://imageshack.us/a/img845/8899/hvjv.jpg[/img] [img]http://imageshack.us/a/img593/7237/2zj5.jpg[/img] While 17.5 inch pounds is within spec, I wanted to get it a little tighter so the shim stack was decreased to give a total height of 0.4435". This gave a preload of 24 inch pounds which I like. [img]http://imageshack.us/a/img11/1826/ftzu.jpg[/img] [img]http://imageshack.us/a/img42/4049/1auo.jpg[/img] At this point the diff is torn down in prep for final assembly. Will update tomorrow. [/QUOTE]
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DIY: IRS 8.8 Diff Rebuild
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