8.1 versus 6.00
Looking at used Chevy/GMC 2500HD's for a TT of about 10,000 GVWR. Would make sure that it has the tow package. We do travel in the Rockies and would like experiences and or opinions on the 8.1 versus...
Forum Discussion
Gearing...HP and torque can be manipulated via gearing...to attain
better MPG and lower RPMs cruising...
Understand this and how it works for those who must "buy'm" pre-eng,
but am hopeful it can be done on an older one... :B Should save
me a few $K's vs buying new/newer
This is where I'm going when rebuilding or updating my Suburban's
7.4L and 4L80E. +500 ft/lbs 7.4L and 1K Ft/lbs rated 4L80E
GearVendors has either 0.70 or 0.50 at around $3K. They haven't gotten
back to me on the ratios yet
7.4L will be forced fed. Not turbine, I don't like any of the potential
routing schemes to date, so belt driven gear...with an intercooler
of my design
Then the diff will go to either 4.88's or 5.54's
Gearing...so my 4 speed 4L80E will become an 8 speed with the
GearVendors electronics that will shift in/out between the 4L80E's
shift points
4L80E's gear ratios will have either a 0.7 or 0.5 gear split betwee these gear ratios
1........2.........3.........4.........R
2.48....1.48....1.00....0.75....2.07
vs the current 6L80E's gear ratios
1..........2.........3.........4.........5.........6.........R
4.027...2.364...1.532...1.152...0.852...0.667...3.064
Toss in my NP241 transfer case compound low gear ratio: 2.72 to 1
and I'll then have 16 gears, but this requires stopping and then
manually pushing the 4x4/low button
A lot of work, but since I keep them all a looooong time...going
to try and update with this portion of my vehicle
better MPG and lower RPMs cruising...
Understand this and how it works for those who must "buy'm" pre-eng,
but am hopeful it can be done on an older one... :B Should save
me a few $K's vs buying new/newer
This is where I'm going when rebuilding or updating my Suburban's
7.4L and 4L80E. +500 ft/lbs 7.4L and 1K Ft/lbs rated 4L80E
GearVendors has either 0.70 or 0.50 at around $3K. They haven't gotten
back to me on the ratios yet
7.4L will be forced fed. Not turbine, I don't like any of the potential
routing schemes to date, so belt driven gear...with an intercooler
of my design
Then the diff will go to either 4.88's or 5.54's
Gearing...so my 4 speed 4L80E will become an 8 speed with the
GearVendors electronics that will shift in/out between the 4L80E's
shift points
4L80E's gear ratios will have either a 0.7 or 0.5 gear split betwee these gear ratios
1........2.........3.........4.........R
2.48....1.48....1.00....0.75....2.07
vs the current 6L80E's gear ratios
1..........2.........3.........4.........5.........6.........R
4.027...2.364...1.532...1.152...0.852...0.667...3.064
Toss in my NP241 transfer case compound low gear ratio: 2.72 to 1
and I'll then have 16 gears, but this requires stopping and then
manually pushing the 4x4/low button
A lot of work, but since I keep them all a looooong time...going
to try and update with this portion of my vehicle
