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Ironrider
10-04-2023, 04:46 AM
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, 07:19 PM
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-Injection/showthread.php?173-1227747-to-16197427-Conversion-PCM-Swap-with-Wiring-Pinout-Directions!
Racer-X
10-04-2023, 08:35 PM
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, 09:59 PM
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 :happy: "Sorry, your password must be at least 8 characters and must contain: • an upper case letter, • a lower case letter, • A numeric digit, • a symbol character, • a musical note, • a hieroglyph, • a haiku, • a feather from an eagle, • a drop of unicorn blood, and • a partridge in a pear tree."
Ironrider
10-05-2023, 03:02 AM
Definitely gm transmission
Ironrider
10-05-2023, 03:12 AM
Haven’t looked at the 91 but the 92p30 has a 16147060 ecm
Ironrider
10-06-2023, 01:23 AM
My 91 ecm is a 1227747
1project2many
10-10-2023, 03:37 AM
My 91 ecm is a 1227747
As mentioned, that ecm does not support an electronic transmission. There are later ecm's that will support the 7.4L / 4L80E combination.