{"id":17178,"date":"2012-09-04T12:29:14","date_gmt":"2012-09-04T17:29:14","guid":{"rendered":"http:\/\/freeautomechanic.com\/mechanic\/forum\/?p=17178"},"modified":"2012-09-04T12:29:14","modified_gmt":"2012-09-04T17:29:14","slug":"1998-chevrolet-silveradok15004x4-5-7l-v-8","status":"publish","type":"post","link":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2012\/09\/1998-chevrolet-silveradok15004x4-5-7l-v-8","title":{"rendered":"1998 chevrolet silverado,K1500,4&#215;4, 5.7L v 8"},"content":{"rendered":"<p>ERROR CODES: p0740 and p1860. after a small investigation I found one site that said if there is more than one code that it&#8217;s probably NOT the transmission&#8230;but the ignition switch. We tested the ignition switch and it&#8217;s getting fire (which was one of the requirements)..does this mean that my problem IS the transmission (p0740:TCC solenoid and p1860:TCM PMW solenoid)?  if so, for the TCC solenoid it shows 4 different ones at the autoparts store&#8230;which one to use and where do they go on the transmission? What it&#8217;s doing&#8230;.not shifting right..although its automatic..it sounds like I&#8217;m winding out the gears a bit. Also,when I start it, it will make a small noise, wait a second,make another small noice and turnover. My fuel mileage is bad. it USE to get pretty good fuel mileage for an 8 cylinder. Please help.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>ERROR CODES: p0740 and p1860. after a small investigation I found one site that said if there is more than one code that it&#8217;s probably NOT the transmission&#8230;but the ignition switch. We tested the ignition switch and it&#8217;s getting fire (which was one of the requirements)..does this mean that my problem IS the transmission (p0740:TCC&hellip;&nbsp;<a href=\"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2012\/09\/1998-chevrolet-silveradok15004x4-5-7l-v-8\" rel=\"bookmark\">Read More &raquo;<span class=\"screen-reader-text\">1998 chevrolet silverado,K1500,4&#215;4, 5.7L v 8<\/span><\/a><\/p>\n","protected":false},"author":8555,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","footnotes":""},"categories":[1,3],"tags":[9042,393],"class_list":["post-17178","post","type-post","status-publish","format-standard","hentry","category-auto-repair-questions","category-chevy","tag-error-codes-p0740-and-p1860","tag-silverado"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.0 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>1998 chevrolet silverado,K1500,4x4, 5.7L v 8 - FreeAutoMechanic Advice<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2012\/09\/1998-chevrolet-silveradok15004x4-5-7l-v-8\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"1998 chevrolet silverado,K1500,4x4, 5.7L v 8\" \/>\n<meta property=\"og:description\" content=\"ERROR CODES: p0740 and p1860. after a small investigation I found one site that said if there is more than one code that it&#8217;s probably NOT the transmission&#8230;but the ignition switch. We tested the ignition switch and it&#8217;s getting fire (which was one of the requirements)..does this mean that my problem IS the transmission (p0740:TCC&hellip;&nbsp;Read More &raquo;1998 chevrolet silverado,K1500,4&#215;4, 5.7L v 8\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2012\/09\/1998-chevrolet-silveradok15004x4-5-7l-v-8\" \/>\n<meta property=\"og:site_name\" content=\"FreeAutoMechanic Advice\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/freeautomechanic\" \/>\n<meta property=\"article:published_time\" content=\"2012-09-04T17:29:14+00:00\" \/>\n<meta name=\"author\" content=\"Beverly\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Beverly\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"1998 chevrolet silverado,K1500,4x4, 5.7L v 8 - FreeAutoMechanic Advice","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2012\/09\/1998-chevrolet-silveradok15004x4-5-7l-v-8","og_locale":"en_US","og_type":"article","og_title":"1998 chevrolet silverado,K1500,4x4, 5.7L v 8","og_description":"ERROR CODES: p0740 and p1860. after a small investigation I found one site that said if there is more than one code that it&#8217;s probably NOT the transmission&#8230;but the ignition switch. We tested the ignition switch and it&#8217;s getting fire (which was one of the requirements)..does this mean that my problem IS the transmission (p0740:TCC&hellip;&nbsp;Read More &raquo;1998 chevrolet silverado,K1500,4&#215;4, 5.7L v 8","og_url":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2012\/09\/1998-chevrolet-silveradok15004x4-5-7l-v-8","og_site_name":"FreeAutoMechanic Advice","article_publisher":"https:\/\/www.facebook.com\/freeautomechanic","article_published_time":"2012-09-04T17:29:14+00:00","author":"Beverly","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Beverly","Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2012\/09\/1998-chevrolet-silveradok15004x4-5-7l-v-8#article","isPartOf":{"@id":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2012\/09\/1998-chevrolet-silveradok15004x4-5-7l-v-8"},"author":{"name":"Beverly","@id":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/#\/schema\/person\/6e8badc3dbcd90c5e949e70ed23475f8"},"headline":"1998 chevrolet silverado,K1500,4&#215;4, 5.7L v 8","datePublished":"2012-09-04T17:29:14+00:00","mainEntityOfPage":{"@id":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2012\/09\/1998-chevrolet-silveradok15004x4-5-7l-v-8"},"wordCount":157,"commentCount":1,"publisher":{"@id":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/#organization"},"keywords":["Error codes- p0740 and p1860","silverado"],"articleSection":["Auto Repair Questions","Chevy"],"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2012\/09\/1998-chevrolet-silveradok15004x4-5-7l-v-8#respond"]}]},{"@type":"WebPage","@id":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2012\/09\/1998-chevrolet-silveradok15004x4-5-7l-v-8","url":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2012\/09\/1998-chevrolet-silveradok15004x4-5-7l-v-8","name":"1998 chevrolet silverado,K1500,4x4, 5.7L v 8 - 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