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Old Mar 10, 2017 | 09:15 AM
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electrician90's Avatar
electrician90
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Need help

I have a 1999 F150 4x4 4.2l auto trans will a 5.4l 4x4 auto trans work
 
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Old Mar 10, 2017 | 10:13 AM
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Darksideforge
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You didn't specify, but I went on the assumption that you meant a 99 5.4L transmission.

The short answer is No. While they are both fundamentally the same 4R70W transmission, they won't interchange. You need a '99 or 2000 4.2L 4x4 Automatic transmission. The 99 5.4L will only fit '99, '00, and '01 5.4L engines.
 
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