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From the Cummins Shop Manual
Section E- Engine Identification
Page E-5
Engine weight
Dry, less flywheel and electrical components

4B3.9, 679 pounds 4BT3.9, 705 pounds 4BTA3.9, 725 pounds


go with the big block springs..

also check out
http://www.4btswaps.com/forum/index.php

how hard are you on the skinny peddle?? d44 may not do the trick.., though if its mostly a highway deal.. then your probably good..
 
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