1969 F100 HELLO FROM KALISPELL MONTANA
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2nd Gear
Joined: May 2026
Posts: 3
Likes: 6
OK, so I found out that the transmission case is cracked and has been welded numerous times.... and not very nicely. The crappy welding job has inhibited the front gaskets from sealing causing a permanent dumping of the fluid. I am thinking it may be wise to purchase a rebuilt one rather than pay $3500+ for replacement of the housing, new hardware, U joint and gaskets and seals then reinstallation.
This is a 1969 2WD F100 with 390FE so it will require I get a C6 automatic transmission. Would you have any pointers for me on this issue?
This is a 1969 2WD F100 with 390FE so it will require I get a C6 automatic transmission. Would you have any pointers for me on this issue?
FTE Community Team
Joined: Jan 2019
Posts: 10,745
Likes: 1,498
I didn't catch it in the description: Is the current one a manual or an automatic?
Since it has been welded, I assume it is a manual with an iron case, but you never know.
If it is a manual, and you still want a manual, you might want to find something with overdrive since you're replacing the whole thing anyways.
If it is an automatic already, I'd assume it is a C-6, and it would be easiest to swap in another C-6 .
Since it has been welded, I assume it is a manual with an iron case, but you never know.
If it is a manual, and you still want a manual, you might want to find something with overdrive since you're replacing the whole thing anyways.
If it is an automatic already, I'd assume it is a C-6, and it would be easiest to swap in another C-6 .
FTE Community Team
Joined: Jan 2019
Posts: 10,745
Likes: 1,498
Post #1 and Post #2 were created fromPost #4 and Post #5 of this thread over in the New Member Introductions forum: https://www.ford-trucks.com/forums/1...l-montana.html
Fleet Mechanic
Joined: Aug 2007
Posts: 1,829
Likes: 256
From: Piney Woods of East Texas
OK, so I found out that the transmission case is cracked and has been welded numerous times.... and not very nicely. The crappy welding job has inhibited the front gaskets from sealing causing a permanent dumping of the fluid. I am thinking it may be wise to purchase a rebuilt one rather than pay $3500+ for replacement of the housing, new hardware, U joint and gaskets and seals then reinstallation.
This is a 1969 2WD F100 with 390FE so it will require I get a C6 automatic transmission. Would you have any pointers for me on this issue?
This is a 1969 2WD F100 with 390FE so it will require I get a C6 automatic transmission. Would you have any pointers for me on this issue?
The main problem with welding cast Al is getting it clean enough to weld. Then since you dealing with machined surfaces, they need to be re-machined. Only a few places have this capability to do it right.
Hotshot
Joined: Jul 2020
Posts: 10,471
Likes: 2,633
From: Near Salt Lake City
Sounds like you are wanting to go from a cast iron case 4 speed to a C6 automatic
So, you need the right C6 case for your FE motor and a flexplate, possibly a different yoke on your driveline, possibly a different length driveline
You'll need flexplate bolts, the crossmember should work,.
You'll need the kickdown link from the carb to the C6
So, you need the right C6 case for your FE motor and a flexplate, possibly a different yoke on your driveline, possibly a different length driveline
You'll need flexplate bolts, the crossmember should work,.
You'll need the kickdown link from the carb to the C6
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