Re: What is needed to add overdrive to 50 Deluxe 288 engine?

Posted by HH56 On 2024/5/14 13:31:24

For the easiest and quickest install a complete transmission with R11 overdrive from a 48-50 junior model. The overdrive is integral with the transmission and can't just be bolted on to your existing trans so you need the complete assy. Junior models (288/327 engine) are needed because 47 and earlier 356 engine trans/ODs have some different heavier parts that would need to change to fit the smaller engines and I believe the same was true for the first of the 48 356s and maybe all of them. You want the R11 OD which was introduced in mid 48 instead of the earlier R9 because it is a much simpler unit both mechanically and electrically and parts are easier to find.

A parts car would be nice because you could see how everything mounts and there are some small pieces you could grab but most of those can be worked around. Once you have the transmission/OD, for a complete factory type install you will need the lockout cable assy and all the electrical components. If you cannot find a parts car or a complete removed system most electrical for the R11 except the governor and lockout cable and switch is in repro although some of the pieces are a bit expensive. Modern components will also work for some of the original electrical items. Some changes to the driveshaft and speedo drive cable will be needed and some of the rear mount or stabilizer pieces are different.