Transmission swap
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Freshman User
Joined: Feb 2010
Posts: 33
Likes: 0
From: Cincinnati
Transmission swap
Hey guys. I've got a 78 F100 swb 2wd 300 inline 6 with a C6 automatic troubles. The forward gears don't engage but it goes into reverse just fine. Checked the linkage and that's where it should be, thinking it's the torque converter. Planning on a rebuild. But I have found another C6 auto from a 91 with the 300 for a good price. It's a Heavy Duty C6. Wondering if it will be a rudimentary swap or will the HD pose an issue. Your thoughts?
Posting Guru
Joined: Aug 2010
Posts: 1,761
Likes: 8
From: Knoxville, TN
Yes, it's internal to the transmission - the clutches and bands are hydraulically-driven; the piston that engages that clutch is sealed by essentially a large O-ring, and that seal has presumably failed, so that the hydraulic pressure no longer engages the clutch, but just slips past the piston.
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