Are you talking about a 240 auto to 240 stick conversion? If yes, then just take the parts off of the 240 stick and put them on the 240 auto bearing in mind that the flywheel could be balancing the crank assembly. The difference is you don't have to monkey with driveshaft lengths and cross-members. Everything is just a straight swap.

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For Sale: 1982 MB 300TD
1995 Chevrolet Suburban 6.5TD

Sold: 1980 IH Scout Traveler- Nissan SD33T Diesel

Do you mean that they might have different flywheels and it is used to balnce the crank?

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1981 240D 143k 4 spd manual -SOLD

2004 VW Jetta TDI 5 speed 300k -still driven daily

automatics dont have flywheels...

They have a flex plate which is attaches to the torque converter.

The flywheel on a manual is balanced.

Converting a 240D auto to manual is fairly straight foward. No changes need to be made. However converting a 300D manual is a lot of work. You need to modify the driveshaft or get hold of a euro 300D and pull the manual tranny parts of it.

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1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)

Thanks, if I keep on learning about these cars I am going to be in deep trouble!

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1981 240D 143k 4 spd manual -SOLD

2004 VW Jetta TDI 5 speed 300k -still driven daily