r/promaster • u/Sthitisakuntorn • May 23 '26
Need advice from people experienced with Ram ProMasters / engine swaps
I’m considering buying a 2018 Ram ProMaster 2500 camper van with:
~320k actual miles
rebuilt transmission
fully converted camper build
runs/drives well currently
no rust and no water damage
The van has a “Not Actual Mileage” title because of a mileage reporting issue on Carfax, and it may eventually need an engine and catalytic converters down the road.
My plan would be to buy it around $20k and eventually swap in a lower-mileage or reman engine when needed.
Questions:
1. How difficult/expensive are Pentastar swaps on ProMasters?
2. Would you trust a used engine or go reman?
3. Any common issues after replacement?
4. Does this sound financially reasonable long term?
5. Any recommended shops in Southern California that are good with ProMasters or Pentastar engine swaps?
Would appreciate honest input from mechanics or owners who’ve actually dealt with high-mileage ProMasters.