{"id":892,"date":"2009-01-14T21:55:26","date_gmt":"2009-01-15T03:55:26","guid":{"rendered":"http:\/\/classicbroncos.com\/tech\/?p=892"},"modified":"2017-11-26T11:00:35","modified_gmt":"2017-11-26T17:00:35","slug":"c4-3-speed-automatic-transmission-guide","status":"publish","type":"post","link":"https:\/\/classicbroncos.com\/tech\/c4-3-speed-automatic-transmission-guide","title":{"rendered":"C4 3 speed automatic – Transmission Guide"},"content":{"rendered":"

Tech article by Jon Hanna (Admin<\/a>)<\/p>\n\n\n\n
Automatic Trans Intro<\/a>
\n\u2022 Gear Ratio Chart<\/a>
\n\u2022 C4<\/a>
\n\u2022 C6<\/a>
\n\u2022 AOD<\/a>
\n\u2022 AODE & 4R70W<\/a>
\n\u2022 700R4<\/a>
\nSee also Manual Trans<\/a><\/td>\n		\"C4<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Transmission:<\/strong><\/td>\n<\/tr>\n
<\/td>\nC4 3 speed automatic<\/td>\n<\/tr>\n
Sources:<\/strong><\/td>\n<\/tr>\n
<\/td>\n1973-1977 Broncos as well as several other Ford cars and trucks from 1964-1981<\/td>\n<\/tr>\n
Identification:<\/strong><\/td>\n<\/tr>\n
<\/td>\nUnlike the other transmissions in this article, the C4 has a removable bell housing. Also see the transmission pan image above for identification.<\/td>\n<\/tr>\n
Adapter required?<\/strong><\/td>\n<\/tr>\n
<\/td>\nBecause the C4 was a stock option on Broncos an aftermarket adapter isn’t needed if you can find a stock unit. If not there are aftermarket adapters available.<\/td>\n<\/tr>\n
Pros:<\/strong><\/td>\n<\/tr>\n
<\/td>\nThis is the simplest, most straightforward and least expensive automatic transmission option because it was originally available on 1973-1977 Broncos. Find a donor Bronco with a C4 and transfer parts. Although the C4 was originally designed for smaller V8’s it has a strong aftermarket following and can take a lot of abuse if built properly.<\/td>\n<\/tr>\n
Cons:<\/strong><\/td>\n<\/tr>\n
<\/td>\nThe C4 has a fairly high first gear without the modern advantages of overdrive. In completely stock form the C4 can be a little weak for high output engines.<\/td>\n<\/tr>\n
Cost: (Approximate)<\/strong><\/td>\n<\/tr>\n
<\/td>\nTransmission: $150-500 used and $500-1400 rebuilt (expect to pay near the upper end of this range if you are getting your C4 out of a 73-77 Bronco.
\nAdapter kit: $500-550<\/td>\n<\/tr>\n
Drive Shaft Mods:<\/strong><\/td>\n<\/tr>\n
<\/td>\nTotal transmission is approximately 1.5″ longer requiring some drive shaft modifications.<\/td>\n<\/tr>\n
Bell housing:<\/strong><\/td>\n<\/tr>\n
<\/td>\nThe C4 came behind small block Ford engines and will bolt up to your 289-302-351 engine.<\/td>\n<\/tr>\n
Modifications needed:<\/strong><\/td>\n<\/tr>\n
<\/td>\nVery few modifications are needed if using a C4 out of a Bronco.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/a><\/p>\n

<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Manual Transmissions<\/strong><\/td>\n1st<\/strong><\/td>\n2nd<\/strong><\/td>\n3rd<\/strong><\/td>\n4th<\/strong><\/td>\n5th<\/strong><\/td>\n<\/tr>\n
Bronco 3 spd (6 cyl)<\/td>\n3.41<\/td>\n1.86<\/td>\n1.00<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
Bronco 3 spd (8 cyl)<\/td>\n2.99<\/td>\n1.75<\/td>\n1.00<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
NP 435<\/td>\n6.69<\/td>\n3.34<\/td>\n1.79<\/td>\n1.00<\/td>\n<\/td>\n<\/tr>\n
T-18<\/td>\n6.32<\/td>\n3.09<\/td>\n1.69<\/td>\n1.00<\/td>\n<\/td>\n<\/tr>\n
Toploader (Close ratio)<\/td>\n2.32<\/td>\n1.69<\/td>\n1.29<\/td>\n1.00<\/td>\n<\/td>\n<\/tr>\n
Toploader (Wide ratio)<\/td>\n2.78<\/td>\n1.93<\/td>\n1.35<\/td>\n1.00<\/td>\n<\/td>\n<\/tr>\n
Toploader (Overdrive)<\/td>\n3.29<\/td>\n1.84<\/td>\n1.00<\/td>\n0.81<\/td>\n<\/td>\n<\/tr>\n
ZF<\/td>\n5.72<\/td>\n2.94<\/td>\n1.61<\/td>\n1.00<\/td>\n0.76<\/td>\n<\/tr>\n
NV4500 (Dodge)<\/td>\n5.61<\/td>\n3.04<\/td>\n1.67<\/td>\n1.00<\/td>\n0.73<\/td>\n<\/tr>\n
Automatic Transmissions<\/strong><\/td>\n1st<\/strong><\/td>\n2nd<\/strong><\/td>\n3rd<\/strong><\/td>\n4th<\/strong><\/td>\n5th<\/strong><\/td>\n<\/tr>\n
Bronco C4<\/td>\n2.46<\/td>\n1.46<\/td>\n1.00<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
C6<\/td>\n2.46<\/td>\n1.46<\/td>\n1.00<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
AOD<\/td>\n2.40<\/td>\n1.47<\/td>\n1.00<\/td>\n.67<\/td>\n<\/td>\n<\/tr>\n
AOD w\/ low gear set<\/td>\n2.84<\/td>\n1.55<\/td>\n1.00<\/td>\n.67<\/td>\n<\/td>\n<\/tr>\n
AODE\/4R70W*<\/td>\n2.84<\/td>\n1.55<\/td>\n1.00<\/td>\n.67<\/td>\n<\/td>\n<\/tr>\n
700R4<\/td>\n3.06<\/td>\n1.62<\/td>\n1.00<\/td>\n.70<\/td>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

Tech article by Jon Hanna (Admin) Automatic Trans Intro \u2022 Gear Ratio Chart \u2022 C4 \u2022 C6 \u2022 AOD \u2022 AODE & 4R70W \u2022 700R4 See also Manual Trans Transmission: C4 3 speed automatic Sources: 1973-1977 Broncos as well as several other Ford cars and trucks from 1964-1981 Identification: Unlike the other transmissions in this […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20,4],"tags":[],"class_list":["post-892","post","type-post","status-publish","format-standard","hentry","category-automatic","category-transmission"],"_links":{"self":[{"href":"https:\/\/classicbroncos.com\/tech\/wp-json\/wp\/v2\/posts\/892","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/classicbroncos.com\/tech\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/classicbroncos.com\/tech\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/classicbroncos.com\/tech\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/classicbroncos.com\/tech\/wp-json\/wp\/v2\/comments?post=892"}],"version-history":[{"count":6,"href":"https:\/\/classicbroncos.com\/tech\/wp-json\/wp\/v2\/posts\/892\/revisions"}],"predecessor-version":[{"id":956,"href":"https:\/\/classicbroncos.com\/tech\/wp-json\/wp\/v2\/posts\/892\/revisions\/956"}],"wp:attachment":[{"href":"https:\/\/classicbroncos.com\/tech\/wp-json\/wp\/v2\/media?parent=892"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/classicbroncos.com\/tech\/wp-json\/wp\/v2\/categories?post=892"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/classicbroncos.com\/tech\/wp-json\/wp\/v2\/tags?post=892"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}