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gearmesh, inc. · 11-22-2011, 12:02 AM

I was watching the tach on Matt's run. 2-3 shift only dropped the rpms from 6k to 5k. That's a loose converter!

I couldn't see the tach in Chris' truck, but I could tell by the sound of the engine that it definitely has a tighter converter.

Engine mod wise, how similar are these two trucks? Rear gear ratios? If very similar, 60ft times and ETs can be compared to weigh the differences between tight vs. loose converters in similarly built Lightnings.

A powerglide combo properly set up tends to have a converter that stalls at about the 70-80 percent mark of usable engine rpm. Matt's converter definitely hits that mark! Matt's 1-2 shift looks to be happening in just a short amount of time out the gate. With the 2.71 first gear ratio of the 4R100 with a loose converter, you wont travel too many feet before a 1-2 shift is in order to keep rpms in check. The tach does show a drop in rpm for the 1-2 shift, though. With all the noise from the exhaust along with the loose converter, I can see why it is hard to tell the 1-2 shift from the sidelines.

11-22-2011, 12:02 AM	#3
gearmesh, inc. creepy azz cracka Join Date: Nov 2008 Location: Summerville Posts: 1,587	I was watching the tach on Matt's run. 2-3 shift only dropped the rpms from 6k to 5k. That's a loose converter! I couldn't see the tach in Chris' truck, but I could tell by the sound of the engine that it definitely has a tighter converter. Engine mod wise, how similar are these two trucks? Rear gear ratios? If very similar, 60ft times and ETs can be compared to weigh the differences between tight vs. loose converters in similarly built Lightnings. A powerglide combo properly set up tends to have a converter that stalls at about the 70-80 percent mark of usable engine rpm. Matt's converter definitely hits that mark! Matt's 1-2 shift looks to be happening in just a short amount of time out the gate. With the 2.71 first gear ratio of the 4R100 with a loose converter, you wont travel too many feet before a 1-2 shift is in order to keep rpms in check. The tach does show a drop in rpm for the 1-2 shift, though. With all the noise from the exhaust along with the loose converter, I can see why it is hard to tell the 1-2 shift from the sidelines. __________________ "I came into this world kicking, screaming,and covered in someone else's blood, I have no problem leaving the same way!" ÔÇ£If you carry a gun, people will call you paranoid. ThatÔÇÖs ridiculous. If I have a gun, what in the hell do I have to be paranoid about?ÔÇØ -Clint Smith, Thunder Ranch. Last edited by gearmesh, inc.; 11-22-2011 at 12:35 AM.