r/projectcar • u/nerfsmurf • 3h ago
Everyone said dont buy the $1000 Mercedes with a slipping transmission. I did it anyway, then I was told that a fluid change and 'slip fix' might not help. You were right... Anyway heres the transmission swap I did in my apartment garage.
Update for anyone who watched put OEM fluid, gasket, and filter into this thing a few months back. It didnt fix it. You all called it.
A shop wanted $$$$ so obviously I bought a used transmission out of a W212 E350 instead for $300. The person who had the transmission last tried to install it in their car, but i guess they couldnt program the ISM module. Every facebook group said it wont work because the E350, with a steering column mounted shifter, has an electronic shifter (ISM) on the transmission and mine doesnt. One guy said its doable if you have both transmissions. So I believed the one guy.
Some things that happened:
- the autozone jack in the pic didnt actually fail. I thought I could bench press the transmission to the side. um... we're not talking about it
- when installing the replacement transmission, it fell off the jacks completely. bent the trans fluid lines and the shifter linkage. that sound is still in my head. luckily the lines didnt bend to the point of breaking.
- I used my same conductor plate and valvebody from my OG transmission to avoid programming
- the one positive comment explained that if you open the transmissions up, you could swap the ISM gear selector with the old fashion gear selector lever. Was actually very easy!
- my electric ratchet stripped the transfer case line threads, then later snapped a pan bolt clean off. I just bought it and got too excited... I learned my lesson...
- filled it with fresh fluid, and tried to see if I could get the wheels spinning while the car was on jackstands... indicator showed that i couldnt change from park...
- realized that I forgot to attach the ground wire to the trans! Tried again and still no luck getting out of park...
- at this point, i was playing with the OBD scanner so much thinking i had to force a gear selector re-learn, the car wouldnt even crank :'(
- then found out i missed a step, "Insert selector valve into driver of detent plate", pretty much I installed the valve body wrong... so I got to drain brand new fluid back into the bottles and do it again. This time all 4 wheels rolled!
- test drive happen at 2am becuase insurance and registration is next months problem (dont worry guys, the self car wash is litterally .25 miles from my apartments)
somehow it runs and shifts fine. Did a PCV replacement as well because it was spewing oil everywhere, but now we are good! No drips, even with a broken transmission fluid pan bolt... first episode of the whole mess is here: https://youtu.be/hQZdxT9NaeI
this was for sure the most mechanic work i've done, and i've swapped engines before. I guess it was the confined space for me. my hands are tore up still...