1988 r20 Suburban Cummins swap

[dwntwn]

This has been an ongoing project. I picked this Suburban up Nov of 2016, its a 2wd TBI 7.4 liter, TH400, 4.10 gears. Over 200k on the odometer, but overall a good running truck. Within 60 days of owning it I'm trying to figure out the best path for overdrive (4l80, gear vendors, etc)

I accidentally found this 91.5 Dodge D250 July 2017, it drove great, was beat up but ran outstanding. 200+ on the broken odometer, no blowby, original—nothing done to the VE pump, etc. Just a good truck. I'd always wanted to do a Cummins conversion, and figured I could at least start on figuring how to get an intercooler into the rectangular Chevy core support.

I started with the idea of using as much as possible off of the Dodge—radiator, intercooler, evaporator, trans cooler. I had a tape measure and thought I had enough figured out to start on an extra core support. (core support images are from August of 2017)