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#1
12-30-2014, 11:43 AM
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123 tranny compatibility
Gents,
I have run across a tranny that is supposed to be out of an 84 300TD. The FSM shows a different model number between the 300TD and the 300D or CD. What would the difference be? Would this tranny fit in my 83 300D? Model number in the manual for the TD is: 722.303. For the 300D and CD it is: 722.315 Thanks for your replies! W. 
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#2
12-30-2014, 12:09 PM
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I was under the impression that the 303 in wagons was changed to the 315 in 1982.
The difference between them is that the 303 has an electronic speedometer (no cable, different speedometer) where the 315 is a mechanical one. My research tells me that you can swap the tailcone over. Easier to swap a 303 cone onto a 315 than vice versa, due to lubrication on the speedo gears. I'm sure Stretch will chime in as he knows these transmissions.
__________________
1981 300TD 310k miles 1970 280sel 172k miles 1966 230 Fintail 162k miles "Where are we going? And why am I in this hand basket?"
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#3
12-30-2014, 12:55 PM
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you CANNOT SWAP THE TAIL CONE TO A GEAR DRIVEN SPEEDOMETER SUCCESSFULLY...
the 303 is from an SD, or an 81TD... not an 84...
__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!!  1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#4
12-30-2014, 02:44 PM
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I've been looking into this as I have a 315 in a parts car that I may have to swap into my '81TD with the 303. I don't want to add a speedo cable and swap the speedo.
While I have read on a couple of occasions that you can swap the 303 cone into a 315 I have never read how. It looks like you have to remove the speedo drive gear and install the electronic "spider". Is this just a matter of pulling the drive gear and replacing with the "spider" or is there something more to it. Also, what do you do with the lubrication tube? Thanks
__________________
1981 300TD 310k miles 1970 280sel 172k miles 1966 230 Fintail 162k miles "Where are we going? And why am I in this hand basket?"
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#5
12-30-2014, 03:32 PM
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Quote:
some have posted that this will fail also though. once you get it open, you will see what needs to swap. fairly simple, just pull the cogs, and swap them over.
__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#6
12-30-2014, 05:21 PM
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I swapped tail cones on my 722.3 transmission from mechanical to electronic. Piece of cake. I've got somewhere between 50 and 60k miles on the tranny. By the way, the tailcone came from a gasser transmission out of the 380SL. As has been said, don't try to go the other way.
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