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Discussion Starter #1
Just goofing off and looking at the numbers.



<TABLE style="WIDTH: 96pt; BORDER-COLLAPSE: collapse" cellSpacing=0 cellPadding=0 width=128 border=0 x:str>
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<TD class=xl22 style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; WIDTH: 48pt; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: transparent" align=right width=64 x:num>3.10</TD></TR>
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<TD class=xl22 style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: transparent" align=right x:num>1.81</TD></TR>
<TR style="HEIGHT: 12.75pt" height=17>
<TD style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" height=17>Third</TD>
<TD class=xl22 style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: transparent" align=right x:num>1.41</TD></TR>
<TR style="HEIGHT: 12.75pt" height=17>
<TD style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" height=17>Fourth</TD>
<TD class=xl22 style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: transparent" align=right x:num>1.00</TD></TR>
<TR style="HEIGHT: 12.75pt" height=17>
<TD style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" height=17>Fifth</TD>
<TD class=xl22 style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: transparent" align=right x:num="00.71">0.71</TD></TR>
<TR style="HEIGHT: 12.75pt" height=17>
<TD style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" height=17>Reverse</TD>
<TD class=xl22 style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: transparent" align=right x:num>-4.49</TD></TR></T></TABLE>


Third gear is in a really odd spot. Using the standard shift point at 3200 rpm, and 31" dia tires these are the MPH for the shifts:



<TABLE style="WIDTH: 48pt; BORDER-COLLAPSE: collapse" cellSpacing=0 cellPadding=0 width=64 border=0 x:str>
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<TD style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" align=right height=17 x:num="43.713062669411812">43.7</TD></TR>
<TR style="HEIGHT: 12.75pt" height=17>
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With 285x75x16 BFG AT's I'm in 5th gear by the 1/8th mile. My truck pulls really hard in 5th gear, but it does in 4th gear as well. When I'm racing on an 1/8th mile track I lock out OD and run it out in 4th gear because the truck will run a slightly better ET, but I haven't tried running the whole 1/4 mile in 4th gear to compare. You will need the extra rpms from a tuner to do so. If you're running a big stack and don't want to limp the stock tranny in 5th gear it would be a good idea to lock out OD for a 1/4 mile run.Edited by: mtomac
 

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Discussion Starter #3
If you're in 5th at the 1/8th, you probably can't get enough RPM to run it out in 4th without tire/gear changes.


You're too damn fast! ;-) My goal is "only" 13.99. I want to take passengers and pass less strict tech.


I think I'm going to try the "4th" only route when I start to run the truck. I'll get 255/80?-16's (33") to get me more gear.


I was supposed to run the truck for the first time (baseline) last weekend, but had too many "honey-do's" on the table. :(Edited by: McRat
 
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