Low range dilemma has been resolved.
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Tuned
Joined: Oct 2020
Posts: 411
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From: Northern Sierra Nevada
Low range dilemma has been resolved.
LOW RANGE DELEMA
This has been copied from the main SD 2017+ forum and is a reply to a long thread on lack of all the low gears in low range.
This pertains mostly to a 2020+ S.D. with the 10 speed automatic and electronic transfer case. Nothing manual here, move along Johnny.
For anyone carrying a truck camper off the beaten path, it should be of interest.
***************************************
Alright, this should be a wrap.
Mea Culpa: I'm a victim of my own experience.
After reading about 20 of yours and the TREMOR PAGE responses to my LOW RANGE DELEMA, I find I'm the culprit here. The secret is higher RPM's.
This A.M. I tried several ways to use low range in MANUAL and in AUTOMATIC modes and it came to me that I was not getting the RPM's up high enough for the computer to stop blinking and allow the shift point.
That goes against everything I know and my experience used in rock crawling. My experience has been with manual truck transmissions; 6.69:1 1st gears; 4:1 low ranges, 142:1 final drives and torque all the way down to idle.
Our 2001 Dodge Cummins (NV5600 manual trans, NV 241 HD manual T.case, beefed up 35 spline Dana 60 and 80 axles with True trac 4.10 diffs) would pull near max torque at 700 rpm without stalling on even the steepest grade. This is control moving over rocky ground)
My 1982 Jeep CJ-8 had a 4.4L Jeep engine redesigned to maximum torque ( bored .060"; heavier flywheel; max torque bump stick) pulling mightily down to 1000 rpms with Dana 44 and 60 axles with air lockers front and rear. I would never use low range at as high an RPM as the FORD S.D. needs to shift.
Now the idiot light comes on:
On our gravel lane I came to a stop and put it into "M" for Manual and tried to go to 4Xlow, whereby the pop up notice said shift to Neutral before this can happen. I did that and pulled the stick back down to "M". Proceeding with somewhat higher RPMs I moved the toggle + & - up to 2nd. No more blinking and it moved smoothly right into 2nd. With this new found roadmap I kept toggling up the shift points all the while using more pedal and RPMs getting all the way, one at a time, to 6th gear. This is all I need.
Now for 4Xlow range AUTOMATIC.
I used the same format for AUTO-LOW RANGE.
Put the shift lever into "D" for drive.
Rotated the 4WD **** to 4XLow range, whereby the pop up notice said shift to Neutral before this can happen. I did that and pulled the stick back down to "D". Now the gear light showed 2nd gear to start. The computer will not allow you start in 1st gear-AUTO. Proceeding with somewhat higher RPMs I went through all gear sequentially up to 6th, whereupon I said that's enough for me. For some with a heavy right foot, the trans may skip-shift up the gear ladder.
Now that I'm retrained for 2020 use this should be the end of the LOW RANGE DELEMA.
Thanks for listening.
Case closed.
jefe
This has been copied from the main SD 2017+ forum and is a reply to a long thread on lack of all the low gears in low range.
This pertains mostly to a 2020+ S.D. with the 10 speed automatic and electronic transfer case. Nothing manual here, move along Johnny.
For anyone carrying a truck camper off the beaten path, it should be of interest.
***************************************
Alright, this should be a wrap.
Mea Culpa: I'm a victim of my own experience.
After reading about 20 of yours and the TREMOR PAGE responses to my LOW RANGE DELEMA, I find I'm the culprit here. The secret is higher RPM's.
This A.M. I tried several ways to use low range in MANUAL and in AUTOMATIC modes and it came to me that I was not getting the RPM's up high enough for the computer to stop blinking and allow the shift point.
That goes against everything I know and my experience used in rock crawling. My experience has been with manual truck transmissions; 6.69:1 1st gears; 4:1 low ranges, 142:1 final drives and torque all the way down to idle.
Our 2001 Dodge Cummins (NV5600 manual trans, NV 241 HD manual T.case, beefed up 35 spline Dana 60 and 80 axles with True trac 4.10 diffs) would pull near max torque at 700 rpm without stalling on even the steepest grade. This is control moving over rocky ground)
My 1982 Jeep CJ-8 had a 4.4L Jeep engine redesigned to maximum torque ( bored .060"; heavier flywheel; max torque bump stick) pulling mightily down to 1000 rpms with Dana 44 and 60 axles with air lockers front and rear. I would never use low range at as high an RPM as the FORD S.D. needs to shift.
Now the idiot light comes on:
On our gravel lane I came to a stop and put it into "M" for Manual and tried to go to 4Xlow, whereby the pop up notice said shift to Neutral before this can happen. I did that and pulled the stick back down to "M". Proceeding with somewhat higher RPMs I moved the toggle + & - up to 2nd. No more blinking and it moved smoothly right into 2nd. With this new found roadmap I kept toggling up the shift points all the while using more pedal and RPMs getting all the way, one at a time, to 6th gear. This is all I need.
Now for 4Xlow range AUTOMATIC.
I used the same format for AUTO-LOW RANGE.
Put the shift lever into "D" for drive.
Rotated the 4WD **** to 4XLow range, whereby the pop up notice said shift to Neutral before this can happen. I did that and pulled the stick back down to "D". Now the gear light showed 2nd gear to start. The computer will not allow you start in 1st gear-AUTO. Proceeding with somewhat higher RPMs I went through all gear sequentially up to 6th, whereupon I said that's enough for me. For some with a heavy right foot, the trans may skip-shift up the gear ladder.
Now that I'm retrained for 2020 use this should be the end of the LOW RANGE DELEMA.
Thanks for listening.
Case closed.
jefe
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