Im swapping the driveline from a wrecked 1987 300td into a 1991 350sdl. The transmission on the 300 td is 722.317 with a cable speedo and the 350 sdl has a 722.361 with electronic speedo sensor. How different are the transmissions? Is it possible to just swap the tail housing? I would almost prefer to just swap the whole transmission since I wouldn't have to wait for a new gasket and output shaft seal. I am worried about the 3.5 trans not shifting properly with the higher revving lower tq 3.0 motor. Both transmissions are in good condition, the 350sdl had a rebuild trans installed 20,000 ago by the PO and the 300td trans has been gone through thoroughly (b2, seals, shift kit). What should I do to have a functional speedo in the 350sdl?

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1987 250D
1984 300TD
1983 300D
2002 Chevy 2500HD Diesel
1995 Dodge 12 valve Cummins Dually
All Biodiesel Powered

Don't know if this helps, but I have an 1987 300D that I changed the tail housing out with one from a SDL. My 300D tail housing was broken in an accident, and the SDL tail housing was the only one I could find at the time. It bolted on easily enough, only to find that the SDL had the electronic pick-up so I had to find another tail housing for the 300D to have the speedometer work. Wish I had encountered you earlier, I would have happily traded the SDL tail housing for the other....

I just used the SDL transmission on the 3.0 engine.

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Greg
2012 S350 BlueTEC 4Matic
2007 ML 320 CDI
2007 Leisure Travel Serenity
2006 Sprinter 432k
2005 E320 CDI
1998 SLK230 (teal)
1998 SLK230 (silver)
1996 E300D 99k, 30k on WVO
Previous:
1983 240D, on WVO
1982 300D, on WVO
1983 300CD, on WVO
1986 300SDL 237k, 25k on WVO (Deerslayer)
1991 350SDL 249k, 56k on WVO - Retired to a car spa in Phoenix
1983 380 SEC w/603 diesel, 8k on WVO
1996 E300D 351k, 177k on WVO

Keep the .361 with the car; very small differences in shift characteristics.
Should you so desire, the valve body could be changed in the future.

do you know how they differ?

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1987 250D
1984 300TD
1983 300D
2002 Chevy 2500HD Diesel
1995 Dodge 12 valve Cummins Dually
All Biodiesel Powered

Hey what color interior is that donor wagon? I have a blue interior on my 87 and I could use some trim bits off it before you junk the body if they are decent.

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The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech

Oh OH OH! I need some hardware from the rear gate! Specifically all of the inside door latch release mechanism. See attached pic, red circles. Bonus would be the lock cylinder with a key that works in it, green circle. Hopefully it is really a TD and not just a turbo diesel...

Attached Thumbnails

 

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Respectfully,
/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC

runny:

In your first post is this statement:
"I am worried about the 3.5 trans not shifting properly with the higher revving lower tq 3.0 motor."

If the difference in engine speed at the shift points was on the order of 1000RPM, you would be correct to be concerned. However, a difference of 100-150RPM between the 300 and the 350, is functionally insignificant. Those who design the valve bodies, I am told, also weigh, to within 2 grams, the amount of jam that they apply to their morning toast.

Adjustments of throttle pressure (Bowden cable), and modulator pressure will settle all changes.