gyrene2003

So, ordered my motive 3.90s with the master install kit. Just wondering what else little **** needs to be bought to do the install. im gonna be helping with it but ive never done it but my mechanic buddy has done alot of them on f-bods and 10-bolts, so he is the man. Just want to know what other **** i need like special tools and what not. Also, any reviews of A4 guys going from 3.23s to 3.90s?

jmdale1984

iTrader: (6)

You might want a different cover gasket if you got the Ratech kit. I got that kit and the cover gasket sucked... luckily I had a TA cover with a new gasket waiting to go on.

As far as getting the carrier and gears out... you'll need 8mm, 10mm, 11mm, 13mm, 15mm, 16mm, 3/4", and 1 1/4" sockets, an air ratchet, impact, BFH, and a pry bar (if I remember correctly). Motive 3.90's should fit without the paddle mod... I didn't have to do it. You're mechanic buddy should have the special tools to measure pinion depth and backlash. For your Motive's, the proper pinion depth will be marked on the face of the pinion gear, and I believe backlash should be set to .008"-.012".

Revelation Z28

iTrader: (10)

.008 is usually the ideal backlash

YOOFORMULA

iTrader: (6)

my gear installer heavily recommends a solid pinion spacer(RAT-4111 from summitracing.com) to prevent premature wear and walk. his 10 bolts have actually taken severe daily duty beatings without failure.

f50nut

Mine are in the mail too.

On that solid pinion spacer, what is different about the install process, and does it really make a big difference?

gyrene2003

so this solid pinion spacer doesent come in the mail with the master install kit from motive? Can i just pick it up at advanced or something? Ill be doing the install at a hobby shop and he did say he doesent have the backlash tool, how much do they run?

gyrene2003

just throwin this out thier, anybody gone from 3.23s to 3.90s and shaved off afew tenths in the 1320?

f50nut

not sure about the motive kit, i bought the ratech kit and it's optional

gyrene2003

gears are here, just waiting on the install kit.

gyrene2003

well, ******* ups isent bringing my install kit until monday and im going to the feild on tuesday so im not gonna be able to do my gears for another 2 weeks!!

crazylane

iTrader: (19)

Hey man hows it going? Let me know on how the car does after the gear install. I am thinking of going 3.73.

On the 6th of next month I should have some track times for you finally. Been really buisy here. Talk at you later.

Good luck with your gears.

Lane

01BlackCamaroSS

iTrader: (1)

i went from the stock gears to the 3.90's and it was a huge differerence the car pulled so nice with the stall and tc, the only thing is that they whine a little bit

aznspeed

iTrader: (6)

I had 390s installed in my 02 ws6. The pinion seal and the nut that came with the install kit did not fit so I had to order the right seal from a local parts store. Other than that, car pulls nicely and no whine what so ever.

mzoomora

iTrader: (36)

The 99-up pinion seals are different, so they must have sold you the wrong kit. The nut should have worked though, so they may have just sold you a messed up kit.

gyrene2003

Well, i finnaly got around to doing those gears. Had to wait on a friend who had lots of experience and not to mention, a dial indicator. Well, havent really gotten around to slamming on the gas yet, as i want to properly break them in, but thier is definatly some noise when i let off the gas at highway speeds, and from what i read, it might have something to do with the shims. what i dont understand, is how do u know when its properly shimmed, it seems like a guessing game, cause with the dial indicator it seemed like we couldnt get anymore perfect, cause we had to do it twice because the first time it was way to tight and the indicator read 0. Well, ill post up again when ive broken them in and put the mickeys on the car.