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duh · 09-22-2009, 05:43 PM

I hope your making serious hp. The 400 is bigger and heavier than your 4L60. If done properly your 4L will handle more than the HP any LTx motor has made. And you still get the 4th gear. Look into a good trans builder and talk to them and see what they say. They also just came out with a new planetary that changes the gear ratio's so there isn't the huge RPM jumps anymore (it's actually the same gearing as a ford trans, but it's better for the straight line. Just an FYI. I personally will be keeping my 700R4 (same as the 4L60).

09-22-2009, 05:43 PM	#5
duh TECH Enthusiast Trader Rating: 4 Join Date: Apr 2009 Location: burbs of chi-town Posts: 584	I hope your making serious hp. The 400 is bigger and heavier than your 4L60. If done properly your 4L will handle more than the HP any LTx motor has made. And you still get the 4th gear. Look into a good trans builder and talk to them and see what they say. They also just came out with a new planetary that changes the gear ratio's so there isn't the huge RPM jumps anymore (it's actually the same gearing as a ford trans, but it's better for the straight line. Just an FYI. I personally will be keeping my 700R4 (same as the 4L60). __________________ 1993 Z, mostly stock with 94K and counting.... The parts list is "long but distinguished" now if only my income could keep up!