The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Diesel 4l80e to Squarebody 7.4l/TBI swap?

**hatzie** · 06-20-2019, 10:51 PM

Through 1994 the 6.x diesels used the cable throttle DB2 injection pump with no ECM. These had a stand alone TCM for the 4L60E & 4L80E. They can be adapted to gasoline engine use. You need to do a handful of internal changes. No I don't know what those changes were but there are some differences between the Diesel 4L80E and the Gasoline 4L80E. It may be as involved as changing the Diesel valve body out with a Gasoline valve body but I'm not sure.
You will definitely need a torque converter that suits the 7.4L RPM, torque, and HP curve.

1995 & later are drive by wire DS4 pumps with the TCM integrated with the ECM. These all in one controllers were called a PCM.

06-20-2019, 10:51 PM	#9
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,915	Re: Diesel 4l80e to Squarebody 7.4l/TBI swap? Through 1994 the 6.x diesels used the cable throttle DB2 injection pump with no ECM. These had a stand alone TCM for the 4L60E & 4L80E. They can be adapted to gasoline engine use. You need to do a handful of internal changes. No I don't know what those changes were but there are some differences between the Diesel 4L80E and the Gasoline 4L80E. It may be as involved as changing the Diesel valve body out with a Gasoline valve body but I'm not sure. You will definitely need a torque converter that suits the 7.4L RPM, torque, and HP curve. 1995 & later are drive by wire DS4 pumps with the TCM integrated with the ECM. These all in one controllers were called a PCM. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.