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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

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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