Hello!

**Ironrider** · 10-04-2023

Glad to have found this forum hope I can learn some great stuff here
My project is a 1991 Silverado C1500 2wd
my donor engine and trans comes from a 1992 Fleeteood Bounder 7.4/4L80E

**TriumphR3** · 10-04-2023

Welcome.
You will need to check your ecm. If it is a 7477 it will not support your 4L80E. It was designed for the nonelectric 700R4. You will need to upgrade to an ecm that supports it such as the 7427. Here is a thread that conversion. http://www.gearhead-efi.com/Fuel-Inj...out-Directions!

**Racer-X** · 10-04-2023

Originally Posted by Ironrider

my donor engine and trans comes from a 1992 Fleeteood Bounder 7.4/4L80E

Are you absolutely sure that one has the 4L80E?

I've done a lot of motorhomes. Most of the P30 Class A motorhome chassis with 454s that I've seen had the Allison Automatic. The 4L80E was used in smaller Class B and Class C motorhomes. Mostly because I think GM specs the 4L80E for a max GVWR of either 15,000 pounds or 18,000 pounds. I've seen a few Bounders from that era, and none were under 20,000 pounds GVWR.

I guess I'm saying, make sure of your transmission. Both were the 4L80E and the Allison were available in 1992 P30 motorhomes, but the 4L80E is rarely seen in a Class A motorhome because of vehicle weight issues.

**In-Tech** · 10-04-2023

Hiya,
GM started using the 454 4L80E in '91 in the pickups, so it is quite possible it has a '7060 pcm with a memcal.

Racer-X Greatest sig line ever

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