{"id":431,"date":"2019-09-09T15:16:43","date_gmt":"2019-09-09T15:16:43","guid":{"rendered":"https:\/\/harristuning.com\/Tbi\/?page_id=431"},"modified":"2019-09-09T15:22:21","modified_gmt":"2019-09-09T15:22:21","slug":"vssb-drac-calibration","status":"publish","type":"page","link":"https:\/\/harristuning.com\/Tbi\/vssb-drac-calibration\/","title":{"rendered":"VSSB DRAC CALIBRATION"},"content":{"rendered":"\n<p> Some 1991 and all 1992-1995 trucks calibrate the speedometer using either a DRAC or VSSB module.&nbsp; Both look VERY similar.&nbsp; The early DRAC used a 7 pin layout and the 1994-1995 VSSB used 14 pins.&nbsp; You can use a 14 pin VSSB as a replacement for a DRAC but not the other way around. <\/p>\n\n\n\n<figure class=\"wp-block-image\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"474\" height=\"424\" src=\"https:\/\/i0.wp.com\/harristuning.com\/Tbi\/wp-content\/uploads\/2019\/09\/DRAC.jpg?resize=474%2C424&#038;ssl=1\" alt=\"\" class=\"wp-image-41\" srcset=\"https:\/\/i0.wp.com\/harristuning.com\/Tbi\/wp-content\/uploads\/2019\/09\/DRAC.jpg?w=640&amp;ssl=1 640w, https:\/\/i0.wp.com\/harristuning.com\/Tbi\/wp-content\/uploads\/2019\/09\/DRAC.jpg?resize=300%2C268&amp;ssl=1 300w\" sizes=\"auto, (max-width: 474px) 100vw, 474px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"474\" height=\"459\" src=\"https:\/\/i0.wp.com\/harristuning.com\/Tbi\/wp-content\/uploads\/2019\/09\/VSSB.jpg?resize=474%2C459&#038;ssl=1\" alt=\"\" class=\"wp-image-67\" srcset=\"https:\/\/i0.wp.com\/harristuning.com\/Tbi\/wp-content\/uploads\/2019\/09\/VSSB.jpg?w=650&amp;ssl=1 650w, https:\/\/i0.wp.com\/harristuning.com\/Tbi\/wp-content\/uploads\/2019\/09\/VSSB.jpg?resize=300%2C291&amp;ssl=1 300w\" sizes=\"auto, (max-width: 474px) 100vw, 474px\" \/><\/figure>\n\n\n\n<p>The way I recalibrate these is to just MOVE the jumper bars to the newly calculated positions for your gear ratio and tire size.&nbsp; The old site done by someone else had you installing DIP switches which would have been nice had GM done that originally but since not something you change that often.&nbsp; I find it easier to just move the jumper bars and certainly cheaper.<\/p>\n\n\n\n<p>There has been an ebay seller making the vssb with the dip switches installed.  With that you dont have any risk to original and easily just use calculator below.<\/p>\n\n\n\n<style>@media (max-width:480px){#cp_calculatedfieldsf_pform_1{min-height:3755px;}}@media (max-width:768px){#cp_calculatedfieldsf_pform_1{min-height:982px;}}@media (max-width:1024px){#cp_calculatedfieldsf_pform_1{min-height:1087px;}}@media (min-width:1024px){#cp_calculatedfieldsf_pform_1{min-height:800px;}}<\/style><form name=\"cp_calculatedfieldsf_pform_1\" id=\"cp_calculatedfieldsf_pform_1\" action=\"https:\/\/harristuning.com\/Tbi\/vssb-drac-calibration\/\" method=\"post\" enctype=\"multipart\/form-data\" onsubmit=\"return fbuilderjQuery.fbuilder.doValidate(this);\" class=\"cff-form no-prefetch  cff-form-1\"  data-nonce=\"c842f0f29b\">\n<input type=\"hidden\" name=\"cp_calculatedfieldsf_pform_psequence\" value=\"_1\" \/>\n<input type=\"hidden\" name=\"cp_calculatedfieldsf_id\" value=\"1\" \/>\n<input type=\"hidden\" name=\"cp_ref_page\" value=\"https:\/\/harristuning.com\/Tbi\" \/>\n<pre style=\"display:none !important;\"><script data-category=\"functional\" type=\"text\/javascript\">form_structure_1=[[{\"form_identifier\":\"\",\"name\":\"fieldname5\",\"shortlabel\":\"\",\"index\":0,\"ftype\":\"fSectionBreak\",\"userhelp\":\"\",\"userhelpTooltip\":false,\"csslayout\":\"\",\"title\":\"Calculate Tire 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DRAC\\\/VSSB\",\"formlayout\":\"top_aligned\",\"formtemplate\":\"\",\"evalequations\":1,\"evalequationsevent\":2,\"autocomplete\":1,\"persistence\":0,\"customstyles\":\"\"},\"formid\":\"cp_calculatedfieldsf_pform_1\"}];<\/script><\/pre>\n<div id=\"fbuilder\">\n\t\t<div id=\"fbuilder_1\">\n\t\t<div id=\"formheader_1\"><\/div>\n\t\t<div id=\"fieldlist_1\"><\/div>\n\t\t<div class=\"clearer\"><\/div>\n\t<\/div>\n<\/div>\n\t<div id=\"cp_subbtn_1\" class=\"cp_subbtn\" style=\"display:none;\">Submit<\/div><div class=\"clearer\"><\/div>\n\t<input type=\"hidden\" id=\"_cpcff_public_nonce\" name=\"_cpcff_public_nonce\" value=\"2a35341df5\" \/><input type=\"hidden\" name=\"_wp_http_referer\" value=\"\/Tbi\/wp-json\/wp\/v2\/pages\/431\" \/><input type=\"hidden\" name=\"cff_form_start_time\" value=\"hei60SUosHt21D5NuOq2qQ==\"><\/form>\n\t\n\n\n\n<table class=\"wp-block-table\"><tbody><tr><th>Jumper Settings Set to closest value<\/th><\/tr><tr><th><br>1 = Jumper connected or switch ON<br>0 = Jumper NOT connected or switch OFF<br>1-7 = Jumper\/switch #<br><\/th><\/tr><tr><th><strong>Input Ratio<\/strong><\/th><th><strong>1<\/strong><\/th><th><strong>2<\/strong><\/th><th><strong>3<\/strong><\/th><th><strong>4<\/strong><\/th><th><strong>5<\/strong><\/th><th><strong>6<\/strong><\/th><th><strong>7<\/strong><\/th><\/tr><tr><td>0.500000<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>0<\/td><\/tr><tr><td>0.505958<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>1<\/td><\/tr><tr><td>0.511230<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>0<\/td><\/tr><tr><td>0.517090<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>1<\/td><\/tr><tr><td>0.522949<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>0<\/td><\/tr><tr><td>0.528809<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>1<\/td><\/tr><tr><td>0.534668<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>0<\/td><\/tr><tr><td>0.540527<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>1<\/td><\/tr><tr><td>0.546875<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>0<\/td><\/tr><tr><td>0.552734<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>0<\/td><td>1<\/td><\/tr><tr><td>0.559082<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>0<\/td><td>0<\/td><\/tr><tr><td>0.565430<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>1<\/td><\/tr><tr><td>0.571777<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>0<\/td><\/tr><tr><td>0.578125<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>0<\/td><td>1<\/td><\/tr><tr><td>0.584473<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>0<\/td><td>0<\/td><\/tr><tr><td>0.591309<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>1<\/td><\/tr><tr><td>0.598145<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>0<\/td><\/tr><tr><td>0.604492<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>1<\/td><\/tr><tr><td>0.611328<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>0<\/td><\/tr><tr><td>0.618164<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>1<\/td><\/tr><tr><td>0.625448<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>0<\/td><\/tr><tr><td>0.632324<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>1<\/td><\/tr><tr><td>0.639648<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>0<\/td><\/tr><tr><td>0.646484<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>1<\/td><\/tr><tr><td>0.653809<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>0<\/td><\/tr><tr><td>0.661133<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>0<\/td><td>1<\/td><\/tr><tr><td>0.668457<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>0<\/td><td>0<\/td><\/tr><tr><td>0.676270<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>1<\/td><\/tr><tr><td>0.683594<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>0<\/td><\/tr><tr><td>0.691406<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>0<\/td><td>0<\/td><td>1<\/td><\/tr><tr><td>0.699219<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>0<\/td><td>0<\/td><td>0<\/td><\/tr><tr><td>0.707031<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>1<\/td><\/tr><tr><td>0.714844<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>0<\/td><\/tr><tr><td>0.723145<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>1<\/td><\/tr><tr><td>0.731446<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>0<\/td><\/tr><tr><td>0.739258<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>1<\/td><\/tr><tr><td>0.747559<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>0<\/td><\/tr><tr><td>0.756348<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>1<\/td><\/tr><tr><td>0.764548<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>0<\/td><\/tr><tr><td>0.773438<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>1<\/td><\/tr><tr><td>0.781738<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>0<\/td><\/tr><tr><td>0.790527<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>0<\/td><td>1<\/td><\/tr><tr><td>0.799805<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>0<\/td><td>0<\/td><\/tr><tr><td>0.808594<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>1<\/td><\/tr><tr><td>0.817671<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>0<\/td><\/tr><tr><td>0.827148<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>0<\/td><td>1<\/td><\/tr><tr><td>0.836426<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>0<\/td><td>0<\/td><\/tr><tr><td>0.845703<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>1<\/td><\/tr><tr><td>0.854980<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>0<\/td><\/tr><tr><td>0.864746<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>1<\/td><\/tr><tr><td>0.874512<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>0<\/td><\/tr><tr><td>0.877441<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>1<\/td><\/tr><tr><td>0.884277<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>1<\/td><\/tr><tr><td>0.894043<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>0<\/td><\/tr><tr><td>0.904297<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>1<\/td><\/tr><tr><td>0.914551<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>0<\/td><\/tr><tr><td>0.924805<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>1<\/td><\/tr><tr><td>0.935059<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>0<\/td><\/tr><tr><td>0.945801<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>0<\/td><td>1<\/td><\/tr><tr><td>0.956055<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>0<\/td><td>0<\/td><\/tr><tr><td>0.966797<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>1<\/td><\/tr><tr><td>0.978027<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>0<\/td><\/tr><tr><td>0.988770<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>0<\/td><td>0<\/td><td>0<\/td><td>1<\/td><\/tr><\/tbody><\/table>\n\n\n\n<table class=\"wp-block-table\"><tbody><tr><td>GM Axle Ratio RPO&#8217;s<\/td><\/tr><tr><td>RPO<\/td><td>Ratio<\/td><\/tr><tr><td>GM1<\/td><td>2.59:1<\/td><\/tr><tr><td>GU2<\/td><td>2.73:1<\/td><\/tr><tr><td>HC2<\/td><td>2.76:1<\/td><\/tr><tr><td>HE3\/G44<\/td><td>3.07:1<\/td><\/tr><tr><td>GU4<\/td><td>3.08:1<\/td><\/tr><tr><td>GU5<\/td><td>3.23:1<\/td><\/tr><tr><td>GU6<\/td><td>3.42:1<\/td><\/tr><tr><td>GT4<\/td><td>3.73:1<\/td><\/tr><tr><td>GT5\/GT8<\/td><td>4.10:1<\/td><\/tr><tr><td>HC4<\/td><td>4.56:1<\/td><\/tr><\/tbody><\/table>\n\n\n\n<table class=\"wp-block-table\"><tbody><tr><td><strong>Gear Ratio Tooth Count<\/strong><\/td><\/tr><tr><td><strong>Ratio<\/strong><\/td><td><strong>Ring Gear<\/strong><\/td><td><strong>Pinion<\/strong><\/td><\/tr><tr><td>2.59<\/td><td>44<\/td><td>17<\/td><\/tr><tr><td>2.72<\/td><td>49<\/td><td>18<\/td><\/tr><tr><td>2.73<\/td><td>41<\/td><td>15<\/td><\/tr><tr><td>2.76<\/td><td>47<\/td><td>17<\/td><\/tr><tr><td>3.07<\/td><td>43<\/td><td>14<\/td><\/tr><tr><td>3.08<\/td><td>40<\/td><td>13<\/td><\/tr><tr><td>3.23<\/td><td>42<\/td><td>13<\/td><\/tr><tr><td>3.42<\/td><td>41<\/td><td>12<\/td><\/tr><tr><td>3.55<\/td><td>39<\/td><td>11<\/td><\/tr><tr><td>3.70<\/td><td>37<\/td><td>10<\/td><\/tr><tr><td>3.73<\/td><td>41<\/td><td>11<\/td><\/tr><tr><td>3.90<\/td><td>39<\/td><td>10<\/td><\/tr><tr><td>4.09<\/td><td>45<\/td><td>11<\/td><\/tr><tr><td>4.10<\/td><td>41<\/td><td>10<\/td><\/tr><tr><td>4.11<\/td><td>37<\/td><td>9<\/td><\/tr><tr><td>4.56<\/td><td>41<\/td><td>9<\/td><\/tr><tr><td>4.86<\/td><td>34<\/td><td>7<\/td><\/tr><tr><td>4.88<\/td><td>39<\/td><td>8<\/td><\/tr><tr><td>5.13<\/td><td>41<\/td><td>8<\/td><\/tr><tr><td>5.29<\/td><td>37<\/td><td>7<\/td><\/tr><tr><td>5.38<\/td><td>43<\/td><td>8<\/td><\/tr><tr><td>5.71<\/td><td>40<\/td><td>7<\/td><\/tr><tr><td>6.14<\/td><td>43<\/td><td>7<\/td><\/tr><tr><td>6.17<\/td><td>37<\/td><td>6<\/td><\/tr><tr><td>7.17<\/td><td>43<\/td><td>6<\/td><\/tr><\/tbody><\/table>\n","protected":false},"excerpt":{"rendered":"<p>Some 1991 and all 1992-1995 trucks calibrate the speedometer using either a DRAC or VSSB module.&nbsp; Both look VERY similar.&nbsp; The early DRAC used a 7 pin layout and the 1994-1995 VSSB used 14 pins.&nbsp; You can use a 14 pin VSSB as a replacement for a DRAC but not the other way around. The &hellip; <a href=\"https:\/\/harristuning.com\/Tbi\/vssb-drac-calibration\/\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">VSSB DRAC CALIBRATION<\/span> <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"nf_dc_page":"","om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"class_list":["post-431","page","type-page","status-publish","hentry"],"aioseo_notices":[],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/harristuning.com\/Tbi\/wp-json\/wp\/v2\/pages\/431","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/harristuning.com\/Tbi\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/harristuning.com\/Tbi\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/harristuning.com\/Tbi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/harristuning.com\/Tbi\/wp-json\/wp\/v2\/comments?post=431"}],"version-history":[{"count":4,"href":"https:\/\/harristuning.com\/Tbi\/wp-json\/wp\/v2\/pages\/431\/revisions"}],"predecessor-version":[{"id":435,"href":"https:\/\/harristuning.com\/Tbi\/wp-json\/wp\/v2\/pages\/431\/revisions\/435"}],"wp:attachment":[{"href":"https:\/\/harristuning.com\/Tbi\/wp-json\/wp\/v2\/media?parent=431"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}