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Driveline
Who can build me a top 8.8" IRS Differential?
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<blockquote data-quote="ShelbyGuy" data-source="post: 3786843" data-attributes="member: 10042"><p>the housing from ford racing (its closer to $600 than $500) comes with a rear cover and a pinion flange.</p><p></p><p>the 8.8 parts interchange between the iron solid axle and the aluminum housing, but the specifications for backlash and carrier bearing preload are different (probably why guys who supposedly know what they're doing end up with noisy gear installs). some differentials do not have the groove for the circlip on the end of the half shaft, so they would need to be disassembled and have some machine work done on the spider gears in order to work in an i.r.s. application.</p><p></p><p>some guys recommend the eaton posi but i would stick with the factory traction-lock if you were thinking of going with a clutch-type differential. the eaton is just a glorified version of the gm 12bolt posi. in my not so very humble opinion, the traction-lock is superior to it (and easily rebuilt). If i were selling you a diff for your purposes, i'd try and talk you into either a true-trac or a c-locker. the locker will take more power, but some people freak out when they drive one around corners. they've been known to lurch and clunk (and its normal). the true-trac doesnt support as much power, but you're not putting down all that much power anyway (relatively speaking). the true-trac is a worm gear differential without clutches. its torque sensing but doesnt have any torque bias preload that i know of.</p><p></p><p>i am not (yet) an authorized vendor here, but i'm familliar with the cobra driveline.</p><p></p><p></p><p></p><p>1. new housing (comes with cover, pinion flange, half shaft pilot bearings and seals) ~$585</p><p>2. differential (c-locker or true-trac, probably the true-trac) ~$600</p><p>3. gearset (what ratio did you want? they're between about $160 and $200 depending) ~$190</p><p>4. install kit (pinion bearings &shims, differential carrier bearings & shims, nut, crush sleeve, gear marking compound) ~$75</p><p>5. billet flow diff housing brace ~$179</p><p>6. ford racing carrier bearing cap stud kit ~$35</p><p></p><p>setup on a new housing takes more time than a used housing. when ford does the machining, they know <em>exactly</em> what size the thing is so they can figure out the shims right away. shims are for the housing, not the gearset. there's definately some math involved to figure out the differential carrier shims. so be prepared to pay a little more for installation with new parts than with used. thats all im trying to say.</p><p></p><p>hope this helps, and i hope you think of me.</p></blockquote><p></p>
[QUOTE="ShelbyGuy, post: 3786843, member: 10042"] the housing from ford racing (its closer to $600 than $500) comes with a rear cover and a pinion flange. the 8.8 parts interchange between the iron solid axle and the aluminum housing, but the specifications for backlash and carrier bearing preload are different (probably why guys who supposedly know what they're doing end up with noisy gear installs). some differentials do not have the groove for the circlip on the end of the half shaft, so they would need to be disassembled and have some machine work done on the spider gears in order to work in an i.r.s. application. some guys recommend the eaton posi but i would stick with the factory traction-lock if you were thinking of going with a clutch-type differential. the eaton is just a glorified version of the gm 12bolt posi. in my not so very humble opinion, the traction-lock is superior to it (and easily rebuilt). If i were selling you a diff for your purposes, i'd try and talk you into either a true-trac or a c-locker. the locker will take more power, but some people freak out when they drive one around corners. they've been known to lurch and clunk (and its normal). the true-trac doesnt support as much power, but you're not putting down all that much power anyway (relatively speaking). the true-trac is a worm gear differential without clutches. its torque sensing but doesnt have any torque bias preload that i know of. i am not (yet) an authorized vendor here, but i'm familliar with the cobra driveline. 1. new housing (comes with cover, pinion flange, half shaft pilot bearings and seals) ~$585 2. differential (c-locker or true-trac, probably the true-trac) ~$600 3. gearset (what ratio did you want? they're between about $160 and $200 depending) ~$190 4. install kit (pinion bearings &shims, differential carrier bearings & shims, nut, crush sleeve, gear marking compound) ~$75 5. billet flow diff housing brace ~$179 6. ford racing carrier bearing cap stud kit ~$35 setup on a new housing takes more time than a used housing. when ford does the machining, they know [i]exactly[/i] what size the thing is so they can figure out the shims right away. shims are for the housing, not the gearset. there's definately some math involved to figure out the differential carrier shims. so be prepared to pay a little more for installation with new parts than with used. thats all im trying to say. hope this helps, and i hope you think of me. [/QUOTE]
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Who can build me a top 8.8" IRS Differential?
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