Transmission Buick

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'86 Lesabre fwd came with 440-T4(4T60) 4 speed automatic
'90 Skylark fwd usually had 125C(3T40) 3 speed automatic
swapping them would not be advisable

If you need transaxle for Lesabre, you could use any 440T4 from '85-'91 fwd GM vehicles provided that chain sprockets and final drive ratios are compatible,also minor electrical changes to valve body harness.
 
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