Originally Posted by SPOILEDRED94
I got a list printed of all my RPO codes... I have a 35/35 and a 2.84 FDR. So to get the FDR of 3.06 that WillWren reccommends I need a Sun gear and differential gear. My dealer parts guy couldnt find a gear actually named Sun gear. Nor could he find anything else I needed. razz. Are there other names for these gears? Which cars carried the compatable 3.06 FDR "diff" and "sun"? If it helps my actual trans code tag says 4YMW.
Unless you want to pay $1k for a diff and sun gear, go to a junkyard and pick up used parts and inspect them.
The junk yards around me always have 4t60-e'* still in cars from people just grabbing the motor.
You just have to:
pop the axle tulip out if it'* still in the trans
Unbolt the diff cover
You'll see the diff is held in by a C-clip that'* on the end of a shaft that goes through the diff. Pop that off with 2 flat heads and the diff will come right out.
The sun gear is on that shaft and goes into the diff. You'll see what I mean.
Just look for the proper RPO before you start pulling it.
And get the same year tranny too. There are differences in the pitch and direction of the planetary pinion gears in the 60 diffs.
To clarify a little bit.
The diff is a carrier with 8 gears.
4 planetary pinion gears are arranged in the 12, 3, 6, and 9 positions on the one end and they have a spiral shape.
The sun gear goes between these 4 spiral gears and is shaped the same.
Those 5 gears differ between different FDR diffs..
There are also 4 gears in the center of the diff, side gears and spider gears. 2 parallel sets that are perpendicular to each other and turn each other. This set of gears allows the wheels to turn at different speeds. 1 of the 2 sets is held in place by the infamous Diff Pin that has a tendency to loose lubrication and either elongate the pin and snap it or blow up the spider gear.
Then there is the vehicle speed sensor rotor that is on the outside of the diff opposite to the spider gears that tells the VSS how fast the diff is spinning.
(p.*. I incorrectly called the planetary pinion gears spider gears in an earlier post)
Heres a pic: