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Discussion Starter · #1 ·
So im trying to find out the difference between the 2 as far as gearing and shift points.... Im in the process of get another trans to rebuilt it so i can put in my car.... I found a HD hud type thing for the 4t65e on zzperformance site but I just need some input and other ideas from you guys thanks.....
 

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Mr. Handy
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Yes the hd diff is slighty larger and is not a true 1:1 ratio set up. So if you put an hd diff in you're impala it would change the final drive ratio from 3.05s to 3.29s.
 

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Discussion Starter · #4 ·
So as far as the power band goes is that going to change how the power drops at 90 mph or stay the same.... Also is that a good idea on going as far as building a 4t65e-hd and later on get the l67 and the throw it in..... Right about now my current trans is starting to give me even more problems..
 
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