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post #1 of 2 (permalink) Old 11-07-11, 07:02 PM Thread Starter
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90' F250 Manual (standard) to Automatic Conversion

Hello All. I bought me a 1990 F250 with a 5.8 (351W) engine in it. Im looking to converting it from a manual (standard) to an automatic for my upcoming contracting job. I can find a donor truck with ease from pullapart, upullit, blacks auto etc... I just need the parts list and maybe a tutorial of how to do this. If someone has already done this, what problems did you encounter when doing this? Im completely rebuilding this truck engine/tranny and body wise but I would like the conversion to be the first step. Immediately after this project I will rebuild the motor and again will need more help lol. I plan on finishing this project atleast before march of next year. Any help would be great :) Thanks in advance.

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post #2 of 2 (permalink) Old 11-25-11, 01:03 AM
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Re: 90' F250 Manual to Automatic Conversion

If you transfer all the hardware over to your truck, you should have about everything you need. Include the 'correct' flywheel for automatic use on your motor.
What you need to know is the trans is likely to be an AOD.
This requires the TV cable assembly to be included as well as the colum shifter and indicator.
The TV cable goes between the transmission and the throttle body.
This trans is not vacuum or electrically shifted.
The cable moves with the throttle and adjusts the transmission internal fluid pressure as load increases.
This also requires the TV adjusment at the throttle body be correct so it tracts the pressure vs throttle.
If the cable is setting is to long in adjustment, the trans pressure will be too low and cause the bands and clutches to burn/slip from lack of pressure to engage them hard enough then you lose the transmission.
The rest is driveshaft length, trans mounting, shift control etc.
Good luck.
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