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| | | | Joined: Jul 2006 Posts: 13 Wrench Fetcher | | Wrench Fetcher Joined: Jul 2006 Posts: 13 | I have a 1-ton truck and the tranny looks larger than most 4-speeds, how can I tell if it is a O/D tranny by casstings, or shifting ,what do I look for??? truck not running thanx
424x4 | | | | | Joined: Dec 2004 Posts: 1,897 Shop Shark | | Shop Shark Joined: Dec 2004 Posts: 1,897 | well one way to tell is If you put the transmission in the top gear and spin the input shaft... the output shaft should be spinning faster. it may be eazier to see if you mark both of them with a grease pen. if you can give us more info as to what year truck you are talking about we may be able to narrow down the transmission for you. there were a lot of clark transmissions used in the early days... some being overdrive, some being direct. | | | | | Joined: May 2005 Posts: 8,878 . | | . Joined: May 2005 Posts: 8,878 | Not always correct, but many medium and big truck 5 speeds have a normal shift pattern when they are direct drive, and the overdrive version will have a slightly messed up shift pattern. the last shift is usually a "U" or an "n" shift, and not a straight across shift like the first few gears are.
A tag with model number is the best way to figure out what you have. Casting numbers are the worst way, as the same case can usualy be used for OD and non OD transmissions.
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