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Manual to automatic conversion

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Old 04-15-2018, 09:52 PM
booskie
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Manual to automatic conversion

Hello, Im looking for some feedback and/or advice. I have a 1972 F350 that has the 4 speed manual transmission. Id love to convert the truck to an automatic for ease of driving. Has anyone done this? Is it simple? Costly? What do I need to do?? Thanks in advance for any input.



 
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Old 04-16-2018, 01:47 AM
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Easy-peasy is to just buy an auto-equipped truck and transfer everything over that way you get all the little hard to find pieces, and scrap or part out the truck.
 
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Old 04-16-2018, 01:47 PM
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A column, a C6, and some time. Likely have to modify the driveshaft in some manner. Not that big of a deal, easier then putting a stick in it. You can leave the clutch pedal in it(or not). The rest just bolts in, the transmission crossmember can just slide and redrill to fit(I've done that putting a stick in them).

The only real issue might be the crossmember under the bellhousing. My '69 was removable to ease getting the bellhousing of the C6 in/out. My '70 stick truck did not come out. You just need to cut the rivets and replace with bolts.
 
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Old 04-16-2018, 09:38 PM
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Originally Posted by booskie View Post
Hello, Im looking for some feedback and/or advice. I have a 1972 F350 that has the 4 speed manual transmission. Id love to convert the truck to an automatic for ease of driving. Has anyone done this? Is it simple? Costly? What do I need to do?? Thanks in advance for any input.
Minor modification to the wiring: You'll probably have to change your Neutral Safety Switch, and the place where it hooks into the wiring.
 
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Old 04-16-2018, 10:09 PM
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Show me a 3 or 4 speed truck that had a NSS or a clutch switch. Never had them until the clutch safety switch happened in the 80's.
 
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Old 04-17-2018, 08:21 AM
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The NSS was only hooked up with an automatic. There is a flat 4 pin plug under the dash. Two are for NSS(which just have a jumper wire for a stick truck), and two for backup lights. The NSS and back up lights will plug into switch on bottom of automatic column.
 
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Old 04-19-2018, 12:02 AM
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Originally Posted by RichS2659 View Post
Show me a 3 or 4 speed truck that had a NSS or a clutch switch. Never had them until the clutch safety switch happened in the 80's.
Even when the transmission is a manual, the wiring harness has a connector for the Neutral Safety Switch.


There's also a provision for an alternate placement of the Reverse Switch.

Even though this is for a 1970, it should be close enough for 1972, at least for that part. The 1972 diagram isn't particularly informative about what plugs into the connectors it shows.

So even without a NSSwitch on the transmission being removed, it's still something to cope with when the automatic transmission is installed.
 
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Old 04-19-2018, 02:08 AM
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The wiring harness has applications for every option known, but there still is not a physical switch located on a manual trans as you insinuated.
 
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Old 04-19-2018, 03:32 PM
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Originally Posted by RichS2659 View Post
The wiring harness has applications for every option known, but there still is not a physical switch located on a manual trans as you insinuated.
It could well be that I was thinking of the Reverse Switch.
 
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Old 04-19-2018, 06:02 PM
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Off the top of my head....
  • Compatible C-6 transmission
  • Flex plate access cover
  • C-6 dipstick & tube
  • Flex plate
  • Starter?
  • Torque converter
  • Driveshaft .. only the front shaft (intermediate shaft) is needed as it will need to be the longer auto trans version.
  • Speedo gear & cable
  • Transmission kickdown linkage
  • Transmission cooler lines
  • Vacuum fittings & hose on intake manifold (for modulator)
  • Steering column for auto trans. Get a tilt column from a Dentside!!
  • Steering column's shift linkages
  • Steering column plate at firewall
  • Pedal linkage assembly for an auto trans truck (or remove/cut off the clutch pedal arm
  • Wide brake pedal pad
  • Neutral start switch (IIRC manual trans trucks have bridged plug)
.
 
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Old Yesterday, 11:17 AM
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Where are you located? I am going the opposite way and will trade parts.
 
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Old Yesterday, 02:39 PM
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which engine do you have in your f250. Just watching. My conversion from 3-on-the-tree to c4 has not been the smoothest. A lot of self-induced misery (wrong c4 for starters).
 
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