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i changed a 4.3L V6 to a 5.3L in a 99 silverado
now the problem is that i kept the same tranny and when a floor it it doesn't rev up high the highest it goes is 3 1/2.
i got a tune so it should do that but it does. so if anybody knows what might know whats the problem let me know.
sorry very unclear on what youre asking, i use the same 4.3L 4l60e tranny behind a 6.0 and besides rebuiding tranny and other issues it works fine, so youre saying with a tune it doesnt rev pass 3500 rpms? is the tune a custom street tune or mail order tune/ what kind of tune is it? is there any mods to the 5.3? is it stock ?
will it free rev to more than 3500 rpm in neutral?
it was a mail in order tune from a guy on ebay. and yes it will rev freely past 3500 on neutral but the problem is when im driving it shifts perfect but when i try to haul ass it wants to throw in the passing gear but it sounds like its slipping. also sometimes it just doesnt do anything at all its just like if im not on the gas and it shifts like if i was cruising. help plz
so im gonna go ahead and say, your first problem was buying a tune from a guy on ebay...... i bet thats your problem.
well i had to get the VATS disabled. but what about if i try the superchips to tune it?
If you're going to tune it, do it right and have Nelson tune it for you. I guarantee you will not be disappointed! It will save you a bunch of headaches!!
That suck you might be better off starting over with a new tune. Who knows what the guy did and how to undo it.
yea i tried the superchips tune but it didnt let tune it.
definately give allen nelson a call, it may solve all your problems...