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12-22-2021, 09:28 PM | #8 |
Registered User
Join Date: May 2012
Location: horseheads,ny rust belt
Posts: 2,794
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Re: 454 Dually with 4.56 rear diff, what auto trans to use
i tow with a GMT-400 1.5 ton 3500-hd truck . its a 8.1 bbc vortec and nv4500 combo with 4.63 rear gears . the trailer i pull every day is 10k loaded full .
i would not go lower if you have any hills . if its all flat land and no hills to climb maybe go better gearing . but its a work truck let it eat and just work . my truck was ether 4.63 or 5.13 gear . i live in a lot of hills and long climbs and wish i had the 5.13 for that stuff but the 4.63 does good so i just run it . make sure tire height is correct and bigger = lower rpm but more work for pulling loads . and changing gears = lots of money and unless BIG change its only a few 100 rpm change per jump . if what you have is working but want more i say go bolt on over drive to let you split each gear to make it a 6 speed . but yes lockup conv on a 4L80-e is nice . but if pulling BIG / HEAVY loads do NOT pull in O/D as it will kill the clutch pack and clutch in the conv faster . years ago i had a truck with a vac guage and it got better running performance in 3rd than overdrive when pulling a loaded trailer . it was a vortec 350/4L80-e / 4.10 combo . good luck and plan correctly as most changes take for ever to pay you back unless you use it that way every day .
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77-k30lb BIG truck build . 87-k30lb budget beater build . 85-k30lb the plow machine build . 85-c10sb summer fun toy . ----------------------------- HOLLEY SNIPER efi = worst case of p.i.t.a i ever had . EDELBROCK pro flo 4 = best deal going so far . love my setup works great. |
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4.56, 454, dually, towing, trans swap |
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