Will a 6 pinion planet gear work in 4L65E

[joecar]

OEM front/input gearset tooth count:
sun = 34
ring = 70
planet = 18
(check 34+2*18=70)
sun:ring velocity ratio (mechanical advantage) = 70/34 = 2.0588

OEM rear/reaction gearset tooth count:
sun = 34
ring = 78
planet = 22
(check 34+2*22=78)
sun:ring velocity ratio (mechanical advantage) = 78/34 = 2.2941


1st gear:

front gearset only:
sun = input
ring = held
carrier = output

In the matrix below:
0 = held stationary relative to case
-1 = reverse rotation

Represent this using a 1x3 matrix:
[ sun       ring    carrier ]

[ 2.0588     -1        0    ]

[ 3.0588     0         1    ]   (added 1 to all elements)

input = 3.0588, output = 1

So 1st gear ratio is 3.0588.

2nd gear:

front carrier drives rear ring and front ring drives rear carrier simulatenously.

front gearset:
sun = input
ring = rear carrier
carrier = rear ring = output

rear gearset:
sun = held
ring = front carrier = output
carrier = front ring

Represent this as 2x3 Matrix:
[ [ sunfront  ringfront  carrierfront ]
  [ sunrear   ringrear   carrierrear ] 
]

[ [ 2.0588  -1  0 ]
  [ 2.2941  -1  0 ] 
]

[ [ 3.0588  0        1       ]   (added 1 to row)
  [ 0       -3.2941  -2.2941 ]   (subtracted 2.2941 from row)
]

[ [ 4.3921  0        1.4359 ]    (multiplied row by 1.4359 from next row)
  [ 0       1.4359   1      ]    (divided row by -2.2941)
]

[ [ 1.3333  0        0.4359 ]    (multiplied row by 0.4359/1.4359)
  [ 0       1.4359   1      ]    
]

[ [ 2.3333  1        1.4359 ]    (added 1 to row)
  [ 0       1.4359   1      ]    
]

[ [ 1.6250  0.6964   1      ]    (divided both rows by 1.4359)
  [ 0       1        0.6964 ]
]

input = 1.6250, output = 1

So 2nd gear ratio is 1.6250.

[joecar]

PATC 6-pinion front/input gearset tooth count:
sun = 38
ring = 70
planet = 16
(check 38+2*16=70)
sun:ring velocity ratio (mechanical advantage) = 70/38 = 1.8421

OEM rear/reaction gearset tooth count:
sun = 34
ring = 78
planet = 22
(check 34+2*22=78)
sun:ring velocity ratio (mechanical advantage) = 78/34 = 2.2941


1st gear:

front gearset only:
sun = input
ring = held
carrier = output

In the matrix below:
0 = held stationary relative to case
-1 = reverse rotation

Represent this using a 1x3 matrix:
[ sun       ring    carrier ]

[ 1.8421     -1        0    ]

[ 2.8421     0         1    ]   (added 1 to all elements)

input = 2.8421, output = 1

So 1st gear ratio is 2.8421.

2nd gear:

front carrier drives rear ring and front ring drives rear carrier simulatenously.

front gearset:
sun = input
ring = rear carrier
carrier = rear ring = output

rear gearset:
sun = held
ring = front carrier = output
carrier = front ring

Represent this as 2x3 Matrix:
[ [ sunfront  ringfront  carrierfront ]
  [ sunrear   ringrear   carrierrear ] 
]

[ [ 1.8421  -1  0 ]
  [ 2.2941  -1  0 ] 
]

[ [ 2.8421  0        1       ]   (added 1 to row)
  [ 0       -3.2941  -2.2941 ]   (subtracted 2.2941 from row)
]

[ [ 4.0810  0        1.4359 ]    (multiplied row by 1.4359 from next row)
  [ 0       1.4359   1      ]    (divided row by -2.2941)
]

[ [ 1.2389  0        0.4359 ]    (multiplied row by 0.4359/1.4359)
  [ 0       1.4359   1      ]    
]

[ [ 2.2389  1        1.4359 ]    (added 1 to row)
  [ 0       1.4359   1      ]    
]

[ [ 1.5592  0.6964   1      ]    (divided both rows by 1.4359)
  [ 0       1        0.6964 ]    
]

input = 1.5592, output = 1

So 2nd gear ratio is 1.5592.

[MyM8V8]

Hi Joe,

Here are pictures of the part discussed.

[MyM8V8]

These are photos of the above kit. Sold by PATC as the Raptor Drive kit. It is essentially the later hardened reluctor shaft and drum from the ISS equipped boxes, with a modified stator support shaft, which allows it to be fitted to the earlier non reluctor LS1 type 300mm boxes 98 to 05. The kit also includes an uprated overun piston and the aluminium drum has a hardened steel re-inforcement ring pressed over the inner flange as shown.

Unfortunately this drum is the weak link of these boxes structurally. We need a 300m version - Mr P ?!!!

ETA: You can see "special use only" stamped on the stator support shaft.

[MyM8V8]

As you requested Joe, some of the other nice shiny bits for the build:

Sonnax performance kit, Superior Industries Billet Servo kits, Alto Carbonite 2-4 band, Rollerised reverse drum, beast sunshell, PATC 300M output shaft, PML +4 qt Ally pan, Poly bush gearbox mount.

It's OK I sold the wife.

[MyM8V8]

More pics.

[joecar]

Thanks for the pics... this will be a nice strong box...

[MyM8V8]

Thanks for the pics... this will be a nice strong box...

Hey Joe,

Thanks for the Math, not my strong point so=awesome.

Which leads me to another Q. As 1st will now be higher (2.84 vs 3.05). I presently have 3.46 in the diff. I also have a set of 3.73's in my cupboard.

Do I put the 3.73's in to compensate (Although I am expecting more HP and Torque from the new motor whcih should drive the higher ratio ok).

ETA: Ute is 3300lbs.

[joecar]

Oh, the one thing I forgot to mention about the math is: use these better precision (more digits) values 2.8421 and 1.5592 instead of 2.84 and 1.56... I am not sure exactly, but the better precision will always help the TCM.

[joecar]

I would try first with the 3.46 gear and note what difference the PATC gearset makes...

Then when you go with the 3.73 gear you will note the difference the 3.73 gear makes...

Otherwise, you won't be able to attribute the individual differences.

My $0.01.