Tranny swap problems
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New User
Joined: Jan 2003
Posts: 16
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Tranny swap problems
I am putting a 4-speed (NP435) in place of the C-6 in my 78 F250. When i went to tighten up the bellhousing to the motor (460) the top two bolts went together like a dream but the bottom four got real tight and wouldn't close the gap between the two pieces. The gap was only about a 1/4 of an inch on each side so i decided to start the engine and see what would happen. I turned the key and the starter couldnt turn the motor over. I tried to manually turn it over at the crank and couldnt budget it. What Gives??? I am in the process of removing the tranny to try again but i was hoping for some tips or solutions to my problem. Any ideas, thoughts, wild/crazy soultions would be greatly appriciated at this point.
Elder User
Joined: Feb 2003
Posts: 760
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From: Boise, ID
Tranny swap problems
Did the engine turn over after you put the flywheel on? You may have flywheel bolts that are too long.
Its also possible that the input shaft is too long causing it to bind into the end of the crank.
Is the pilot bearing seated all the way in the crank?
It's also possible the pressure plate is interfering with the bellhousing. Not very likely though.
You did use the plate that gets sandwiched between the bellhousing and engine, right?
There's a few things to look at. Keep us posted and GOOD LUCK!!
Its also possible that the input shaft is too long causing it to bind into the end of the crank.
Is the pilot bearing seated all the way in the crank?
It's also possible the pressure plate is interfering with the bellhousing. Not very likely though.
You did use the plate that gets sandwiched between the bellhousing and engine, right?
There's a few things to look at. Keep us posted and GOOD LUCK!!
Posting Guru
Joined: Feb 2003
Posts: 1,054
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From: The Great Plains
Tranny swap problems
Had this same thing once all the swappers said bull to me but the front shaft was to long by the thicknes of a block plate (put 2 instead of 1 it would turn) good luck
