32s on 3.73
#1
Join Date: Oct 2008
Location: Indianapolis
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#5
Here is the chart:
The chart is divided into three categories. The rpm highlighted in black are optimum for the tire size and ratio combination. These will most closely give you the best overall drivability. If you're looking for a ratio that will give better fuel economy for highway driving at the expense of some acceleration and overall performance, choose a ratio in the yellow shaded area. If you're looking for a ratio that will improve acceleration and towing power at the expense of some fuel economy, choose a ratio in the blue shaded area.
The chart is divided into three categories. The rpm highlighted in black are optimum for the tire size and ratio combination. These will most closely give you the best overall drivability. If you're looking for a ratio that will give better fuel economy for highway driving at the expense of some acceleration and overall performance, choose a ratio in the yellow shaded area. If you're looking for a ratio that will improve acceleration and towing power at the expense of some fuel economy, choose a ratio in the blue shaded area.
#8
The chart is divided into three categories. The rpm highlighted in black are optimum for the tire size and ratio combination. These will most closely give you the best overall drivability. If you're looking for a ratio that will give better fuel economy for highway driving at the expense of some acceleration and overall performance, choose a ratio in the yellow shaded area. If you're looking for a ratio that will improve acceleration and towing power at the expense of some fuel economy, choose a ratio in the blue shaded area.
#11
#12
not really. if you want the truck to "feel" the same (ie same low end performance) you need to regear.
the reprogramer will just correct the speedometer and tachometer, which will read low with larger than stock tires.
#17
I know. Like the X-Cal II, right? That is only going to correct your speedo and tach. it will give you more power with a tune, but wont make a large enough difference to counteract the loss of power from larger tires. Re-gearing is the only thing that will maintain the same low end power you have the stock smaller tires.
I only say this because I am running a tune from Bama Chips with my Xcal and i have 33"s with 3.73. The tune did nothing, my truck still lags compared to when it had stock tires
I only say this because I am running a tune from Bama Chips with my Xcal and i have 33"s with 3.73. The tune did nothing, my truck still lags compared to when it had stock tires
Last edited by 08XLT4x4; 10-03-2008 at 03:34 PM.
#18
#19
hmm i'll have to research that a little better. thanks.
jack, yea if it's an auto, i'd regear. if you can afford it mind you. if you can't afford to regear, i'd look into a shift kit. it won't help with the loss of power but it will help your transmission to shift properly and keep it from overheating.
jack, yea if it's an auto, i'd regear. if you can afford it mind you. if you can't afford to regear, i'd look into a shift kit. it won't help with the loss of power but it will help your transmission to shift properly and keep it from overheating.
#22
Re-gearing is expensive. A tuner and a underdrive crank pully are cheaper and will get the perception of power back. Probably increase it actually.
Rich
#24