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Hi, I am new to this and hopefully it will be good to me. I have a 1983 Ford F-250 4x4 with the 6.9 diesel and 4 speed transmission. I am wanting to change the transmission to a 5 speed but I cant seem to find out what will interchange on this set up. If anyone has done this or can tell me what will work it would be greatly appreciated. you may contact me at smeeker03@sprintpcs.com and I will keep checking here also. Thanks Steve
I did the automatic equivalent of this upgrade, C6 to E4OD, but the 4 speed to 5 speed swap is more common, though overall still not very common.
The transmission you want is the ZF 5 speed from a 1987 and up F250/F350, the transfer case should change over, drive shaft will need to be shortened, and I'm not sure about the flywheel or the clutch hydraulics. CheeperJeeper is a member who did this swap.
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