barit 1...apologies...I think I may have been thinking of a reference to the ANG KC-135E conversions where the JT3D fans replaced straight J-57s so were heavier but there does seem to have been a gross weight increase permitted so I'd better shut up until I find the reference :-)
EDIT bare engine weights seem to be
J-57 (JT-3C) as in KC-135A ~3495lb
JT-3D turbofan as in KC-135E ~4360lb
CFM56-2 as in KC-135R ~4671lb
Last edited by A30yoyo; 23rd Sep 2014 at 00:37.
Reason: more facts