How Difficult to replace Extension housing?

Hi...I have an 833 with the shorter extension for my Duster..I purchased an 833od that came with the longer extension. How hard is it to adapt the shorter ext. to the 833od?..Dan

You can't , the mainshaft is different between the std 833 and the OD where 3rd gear mounts, also most all 833OD A/F body trans have a 904 sized output shaft.

If you really want the OD trans I am pretty sure I have the tailhousing and the mainshaft from an A/F OD trans , I know I have the tailhousing , I'll have to check for the mainshaft. I'll sell you the parts cheap , heck I'll trade them for the non OD 833 :-D