4.3L, nv3500 with 4.56
09-29-2017, 08:28 PM
#1
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4.3L, nv3500 with 4.56
First off yes im going to do an engine swap bit i cant get to that until next year. In the meantime im doing everything else tgat wont take a lot of time as im workiny 70hrs a week right now. Basically suspension-beltech complete 2/4 drop kit wity performance shocks, rear sway bar new ball noints and bushing etc.
It's a 2002 RCSB silverado 4.3 rwd, nv3500 with 305/40r22 tires(31.6 tall), And 3.42 open gears. Going to a 6.0w/t56 6 speed with 4.56 and truetrac aiming for 450rwhp .
If prefer to rebuild the rear end now when I do the drop kit and brake kit. But I'm worried what 4.56 gears will do with the 4.3 and nv3500. Can anyone help.me out with what to expect. I pretty much only drive in town almost never on interstate and only occasionally on the highway.
It's a 2002 RCSB silverado 4.3 rwd, nv3500 with 305/40r22 tires(31.6 tall), And 3.42 open gears. Going to a 6.0w/t56 6 speed with 4.56 and truetrac aiming for 450rwhp .
If prefer to rebuild the rear end now when I do the drop kit and brake kit. But I'm worried what 4.56 gears will do with the 4.3 and nv3500. Can anyone help.me out with what to expect. I pretty much only drive in town almost never on interstate and only occasionally on the highway.
10-01-2017, 05:44 PM
#3
I run 4:56’s in my truck with a 6.0 and 78mm and it is a monster.
The gears will really help get you going with that baby motor. But don’t fear the gear. It’s not THAT bad, just a bit more wound up on the highway, but cruising around town they are perfect. They are also great for light to light runs
The gears will really help get you going with that baby motor. But don’t fear the gear. It’s not THAT bad, just a bit more wound up on the highway, but cruising around town they are perfect. They are also great for light to light runs
10-04-2017, 08:30 PM
#7
I had 4,56 in a camaro with a t56 and it wasn't too bad. Not as bad as the nvg4500 with a 3,73. First was still useful. Probably even more so in a big heavy truck. Good for hills and traffic.
Last edited by 2002_Z28_Six_Speed; 10-09-2017 at 09:00 AM.
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10-05-2017, 06:27 AM
#9
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4.10s with 2.66 1st gear 10.9:1
I run the 4.1 rear and 3.06:1 1st gear for a 12.55:1.
The T-56 in a ZO6 is RPO M12 and has the shorter 1st gear than the other transmissions. It has the 2.97:1 1st gear ratio. With a 3.90 rear gear and 2.97:1 1st gear of the M12, it gives a 11.58:1.
You 2 are comparing 2 different ratioed transmissions.
You also have to gear for the T-56 fir its super high 0.50:1 6th gear. This is where the lower 4.1s work great for cruising. Shifting from 4th to 6th cuts engine rpm in half.
peace
Hog