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#1
10-04-2023, 01:41 PM
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w115 240d 4 speed manual transmission swap into w123 300d
I have a 1982 300d with an automatic transmission. The transmission went out so I am trying to find a manual transmission to swap into it. I have located a wrecked w115 with a manual transmission near me for cheap. I know there are some differences between the manual setup in the w115 and the w123. can the parts(petal assembly and the shifter assembly) be easily modified to work on the w123? I know I will have to make my own transmission mount, have the driveshaft shortened or lengthened, and have the flywheel balanced. Any insight is much appreciated.
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#2
10-05-2023, 07:46 AM
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some years will interchange. late 115 into early 123.
__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.  [SIGPIC]..I also have a 427 Cobra replica with an aluminum chassis.
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#3
10-05-2023, 10:21 AM
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The transmission is a bolt-on to the engine. Yes, the flywheel will have to be matched to the imbalance of the 5-cyl. wheel. The shift linkage rods will have to be changed in length.
The pedal assembly will have to be from a 123. Shameless plug: I have a 123 pedal assembly available.
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#4
10-05-2023, 01:36 PM
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There are old threads around describing the method to match balance the stick flywheel to the engine.
__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual. [SIGPIC]..I also have a 427 Cobra replica with an aluminum chassis.
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