droc71 Posted February 24, 2014 Report Share Posted February 24, 2014 will the transmission out of a d21 fit like the trans out of a 720? im building a z24 motor for my 521 and I know that an early 80 model 510 trans will fit but im not fond of reverse where first should be!! Quote Link to comment
ggzilla Posted February 24, 2014 Report Share Posted February 24, 2014 There are at least 3 different fitments of 720 manual transmissions. 1980 510 gearbox is too weak for a Z24. Quote Link to comment
datzenmike Posted February 24, 2014 Report Share Posted February 24, 2014 will the transmission out of a d21 fit like the trans out of a 720? im building a z24 motor for my 521 and I know that an early 80 model 510 trans will fit but im not fond of reverse where first should be!! . Yes if the D-21 transmission is bolted to a Z24i or a KA motor and NOT the VG. They have the same mounting bolt pattern. An S13 or S14 KA transmission will also work from a 240sx. Your only problem will be modifying the tranny mount at the back and shortening the drive shaft. Quote Link to comment
nis720 Posted February 24, 2014 Report Share Posted February 24, 2014 . Yes if the D-21 transmission is bolted to a Z24i or a KA motor and NOT the VG. They have the same mounting bolt pattern. An S13 or S14 KA transmission will also work from a 240sx. Your only problem will be modifying the tranny mount at the back and shortening the drive shaft. The way the starter mounts is different on the 240sx. 720/D21 starter bolts thread into the trans bellhousing and 240sx starter bolts thread into the starter. Also the 240sx starter have a longer snout because the engine block has extra material where the starter sits. Quote Link to comment
datzenmike Posted February 24, 2014 Report Share Posted February 24, 2014 Yep, the S13 KA blocks/starters are different by design But the transmissions are the same bolt pattern and will bolt up to other KAs or Z series motors. This is my '89 block but I didn't remove the starter so I'll check for threads in it. Either way, a Z series starter will mount with nuts and bolts. The 240sx 5 speeds are all much longer than the D-21s. Quote Link to comment
Charlie69 Posted February 25, 2014 Report Share Posted February 25, 2014 what mike said. Quote Link to comment
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