Re: Shift or not
[Re: emarine01]
#1371416
01/18/13 06:31 PM
01/18/13 06:31 PM
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Joined: Dec 2009
Posts: 20,640
in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,640
in a cattle trailer down by th...
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Quote:
Ok as most of you know this is a 200ft mud track question so bear with it and apply what you know to the circumstances, I run lo range with a 727 & a 5k stall that flashes @ 5400 , We shift twice and in 3rd @ the traps we have 85 MPH wheel speed @ 7k, If I run Hi range in first gear @ 7k I have 85 MPH, Which do you think will ET faster? Shift twice in Lo or no shifting in Hi 1st gear?
Don't know. Lots of variables being a mud truck and all. Why don't you just try it?
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost conversion.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: Shift or not
[Re: Guitar Jones]
#1371417
01/18/13 08:39 PM
01/18/13 08:39 PM
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Joined: Jan 2007
Posts: 3,695
nc
emarine01
OP
master
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OP
master
Joined: Jan 2007
Posts: 3,695
nc
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Quote:
Quote:
Ok as most of you know this is a 200ft mud track question so bear with it and apply what you know to the circumstances, I run lo range with a 727 & a 5k stall that flashes @ 5400 , We shift twice and in 3rd @ the traps we have 85 MPH wheel speed @ 7k, If I run Hi range in first gear @ 7k I have 85 MPH, Which do you think will ET faster? Shift twice in Lo or no shifting in Hi 1st gear?
Don't know. Lots of variables being a mud truck and all. Why don't you just try it?
Good point Jones ...  .... But then I'll have to wait for spring 
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Re: Shift or not
[Re: Cab_Burge]
#1371419
01/20/13 10:27 PM
01/20/13 10:27 PM
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Joined: Nov 2005
Posts: 522
Lenox Iowa
MMiller
mopar
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mopar
Joined: Nov 2005
Posts: 522
Lenox Iowa
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Why not just start in 3rd gear, low range? That way the trans is in 1:1 and your gear reduction is clear back in the transfer case.
Wheather I'm 4 wheeling, mud racing, or truck pulling I run low range. It moves the torque further back in the drive line. You will likely not hurt anything with the gas engine, but a buddy used to run a hot cummins with a 727 in an offroad truck. Whenever he used high range, he would either break the output shaft of the trans or the input to the transfer case.
Whenever a Chevy with a 4speed that runs very good tries to pull high range, 1st gear(its slightly faster then low range 2nd), they almost always will brake the coupler between the trans and t-case. If they hook in low range and pull in 2nd, they get to make many passes with no breakage.
Michael
93 W250 CTD getrag, Bosch 185 injectors, AFE air filter. Trailer puller, daily driver,
90 W250 CTD 727 with smokin 5" stacks. Off road truck
75 Dodge W200 440 4spd 4x4 locked front and rear, twin disc clutch, E85. Pulling truck
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Re: Shift or not
[Re: MMiller]
#1371420
01/21/13 02:57 AM
01/21/13 02:57 AM
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Joined: Feb 2006
Posts: 2,379
MD
Kevins493
top fuel
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top fuel
Joined: Feb 2006
Posts: 2,379
MD
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Quote:
Why not just start in 3rd gear, low range? That way the trans is in 1:1 and your gear reduction is clear back in the transfer case.
Wheather I'm 4 wheeling, mud racing, or truck pulling I run low range. It moves the torque further back in the drive line. You will likely not hurt anything with the gas engine, but a buddy used to run a hot cummins with a 727 in an offroad truck. Whenever he used high range, he would either break the output shaft of the trans or the input to the transfer case.
Whenever a Chevy with a 4speed that runs very good tries to pull high range, 1st gear(its slightly faster then low range 2nd), they almost always will brake the coupler between the trans and t-case. If they hook in low range and pull in 2nd, they get to make many passes with no breakage.
Michael
Also less chance of damaging the sprag than if it was in first.
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