Transmission ID Codes
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Senior User
Joined: Nov 2003
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From: Northwest BC. Canada
Transmission ID Codes
I have a 1990 F150 4X4 with an AOD transmission, door code K. I have a 1988 F150 4X4 for parts with an AOD?, door code K. I assume this is the original transmission in this truck. I need a transmission. according to the selector letters, my 1990 has the PRNDD1 and the 1988 has PRND21. will this mean that the 1988 has a 3 speed with no OD?
Any help is good help.
.
Dan
Any help is good help.
.
Dan
Post Fiend
Joined: Mar 2002
Posts: 19,402
Likes: 38
From: Bonita Springs FL
K is the code for a C6, not an AOD. This would explain the selector patterns in the 88, but not the 90.
Have you crawler under the truck and looked at the transmissions? Do they look the same? Length? Pan shape and size? Number of bolts in each pan?
Have you crawler under the truck and looked at the transmissions? Do they look the same? Length? Pan shape and size? Number of bolts in each pan?
Post Fiend
Joined: Mar 2002
Posts: 19,402
Likes: 38
From: Bonita Springs FL
I'm no expert on parts compatibility, but here's a partial list of what you might run into:
Tranny crossmember problems
Drive shaft lengths - front & rear
Tranny/TC bolt up problems - not sure if they're compatible.
The good news is that neither tranny is computer controlled, so you won't have to dig too deeply into the electronics side.
Also keep in mind that your gas mileage will drop noticably because the C6 has no overdrive. However, the C6 is a much more reliable transmission than the AOD.
Tranny crossmember problems
Drive shaft lengths - front & rear
Tranny/TC bolt up problems - not sure if they're compatible.
The good news is that neither tranny is computer controlled, so you won't have to dig too deeply into the electronics side.
Also keep in mind that your gas mileage will drop noticably because the C6 has no overdrive. However, the C6 is a much more reliable transmission than the AOD.
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