{"product_id":"speedfactory-wagovan-rt4wd-diff-install-kit-mfactory-lsd","title":"SpeedFactory Wagovan RT4WD Diff Install Kit for MFactory LSD","description":"\u003cul\u003e\n\u003cli\u003e10 black oxide Grade 12.9 bolts \u003c\/li\u003e\n\u003cli\u003e2 precision stainless steel shims \u003c\/li\u003e\n\u003cli\u003eFits 1988-1991 Honda Wagovan RT4WD \u003c\/li\u003e\n\u003cli\u003eRequires MFactory D16 40mm LSD \u003c\/li\u003e\n\u003cli\u003e40x68x22 NTN bearings \u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c!-- split --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli\u003e\u003ca class=\"active\" href=\"#Description\"\u003eDescription\u003c\/a\u003e\u003c\/li\u003e\n \u003cli\u003e\u003ca href=\"#VehicleFitment\"\u003eVehicle Fitment\u003c\/a\u003e\u003c\/li\u003e   \u003cli\u003e\u003ca href=\"#Included\"\u003eIncluded\u003c\/a\u003e\u003c\/li\u003e \u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\n\n\u003cli class=\"active\" id=\"Description\"\u003e\n\n\u003ch3\u003eSpeedFactory AWD Wagovan Rear Diff Install Kit for MFactory LSD\u003c\/h3\u003e\n\u003cp\u003eIf you're building an RT4WD Civic Wagon into anything serious, the open rear diff is the first thing that has to go, and until this kit existed, getting an LSD into that rear end meant machining bolt heads, hogging out bolt holes, and guessing at shims. SpeedFactory built this install kit for their own AWD drag program, and it turns the MFactory D16 40mm LSD into a true drop-in for the Wagovan rear differential.\u003c\/p\u003e\n\u003ch3\u003eWhat It Is and Why It Works\u003c\/h3\u003e\n\u003cp\u003eThe kit is ten custom bolts and two precision shims, and every piece exists to solve a specific mismatch between the MFactory LSD and the Honda rear end. The bolts are black oxide coated Grade 12.9 with a low-profile flanged head that clears the differential carrier towers, and an enlarged shoulder that fills the MFactory LSD's unthreaded secondary holes, which are both larger in diameter and on a wider bolt circle than the threaded holes in the Wagovan ring gear. That shoulder fit is the detail that matters: it locks the ring gear with zero side-to-side slop, where cut-down OEM bolts, hardware store hardware, or even expensive studs in mismatched holes all leave play the driveline will find under load.\u003c\/p\u003e\n\u003cp\u003eThe shims are the other half of the trick. MFactory machines their D16 LSD a specific amount narrower than the OEM differential, symmetric on both sides relative to the ring gear mounting face, and Honda held tight tolerances on the original diff. SpeedFactory's precision stainless shims bring the LSD back to exact OEM width, which places the ring gear in the factory-set position between the carrier towers using your original outer shims in their original locations. The result is that factory bearing preload, gear mesh pattern, and backlash are all retained rather than re-established from scratch. That's why this installs as a drop-in instead of a measure-everything-twice afternoon, and it's the answer to the skeptics who insist any diff swap demands a full re-shim: it doesn't when the tolerance stack was engineered to land where Honda already put it.\u003c\/p\u003e\n\u003cp\u003eNone of that replaces good building practice, and SpeedFactory says so themselves. Verify your clearances on assembly, and if you're doing a full rear end rebuild rather than dropping an LSD into a healthy diff, you're setting and checking mesh, backlash, and tolerances regardless, because a rebuild resets everything the factory once set.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBolts\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e(10) black oxide Grade 12.9, flanged low-profile head, enlarged shoulder\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eShims\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e(2) precision stainless steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNot included\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMFactory D16 40mm LSD (MF-TRS-05D15) and differential bearings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSKU\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSFR-05-200 (Mfg SF-05-200)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e\u003cbr\u003e\u003c\/h3\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eYears\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eVehicle\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eEngine\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1988-1991\u003c\/td\u003e\n\u003ctd\u003eHonda Civic Wagon RT4WD (Wagovan)\u003c\/td\u003e\n\u003ctd\u003eD16A6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eThe kit fits the RT4WD rear differential itself, so it applies just as much to swapped AWD wagon builds, B series, K series, or boosted D, that keep the factory rear end as it does to a stock D16A6 wagon. If your build sends real power through that rear diff, this is the piece that makes the LSD install correct instead of improvised. SpeedFactory developed it for their own AWD Honda drag cars, which have run six-second passes with this exact rear end setup, per the manufacturer.\u003c\/p\u003e\n\u003ch3\u003eWhat to Know Before You Buy\u003c\/h3\u003e\n\u003cp\u003eYou need the MFactory D16 40mm LSD to go with it, since this kit is the hardware and shims only. If your differential bearings are tired or you're pressing on fresh ones anyway, the correct bearings are the 40x68x22 NTN units under Honda part number 91006-PX5-008, not included in the kit. And be honest about the state of your rear end before you start: this kit assumes a good-condition differential with its factory shimming intact. A worn or previously-opened rear end that's lost its original outer shims turns this from a drop-in back into a proper rebuild, and at that point you're measuring everything no matter whose hardware is in the box.\u003c\/p\u003e\n\u003c\/li\u003e\n\n \n\u003cli id=\"VehicleFitment\"\u003e\n \u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eYears\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eVehicle\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eEngine\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1988-1991\u003c\/td\u003e\n\u003ctd\u003eHonda Civic Wagon RT4WD (Wagovan)\u003c\/td\u003e\n\u003ctd\u003eD16A6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e \n\u003c\/li\u003e\n\n\n\n\n\n\n \n\u003cli id=\"Included\"\u003e\nInstallation Kit Includes:\u003cdiv\u003e\u003cul\u003e\n\u003cli\u003ex10 Black Oxide Coated Grade 12.9 Bolts\u003c\/li\u003e\n\u003cli\u003ex2 Precision Stainless Steel shims\u003c\/li\u003e\n\u003c\/ul\u003e\u003c\/div\u003e\n\u003c\/li\u003e\n\n\n\n\n\n\n\n\n\n\n\n\n\u003c\/ul\u003e\n","brand":"SpeedFactory","offers":[{"title":"Default Title","offer_id":45918901993506,"sku":"SFR-05-200","price":104.73,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2218\/5701\/files\/SFR-05-200_uhkh.jpg?v=1783544970","url":"https:\/\/www.hybrid-racing.com\/products\/speedfactory-wagovan-rt4wd-diff-install-kit-mfactory-lsd","provider":"Hybrid Racing","version":"1.0","type":"link"}