4 Speed Auto Help Required

[Deep Dish V35]

trans was opened up today

had a proper oil flush/replace 10,000km ago.... currently the fluid looks like red glitter paint. there is absolutely nothing left of the friction bands. And before you say it, NO i dont do burnouts. This is after normal use (by me). maybe the previous owners were not so kind...

so its in for a complete rebuild plus trans kit. $3000 approx..... and the shift kit is the cheapest bit.

this probably explains why my gearchanges have felt so slow and lethargic. unfortunately it gave no other warning signs, crunches or bangs, it just stopped working.

Not stressed about it. Love the car to bits

Edited October 12, 2012 by Deep Dish V35

[t5iv]

That sucks mate. Rebuild to factory spec or with stronger bits?

[Deep Dish V35]

factory spec bands, solenoids, etc. just the modified valve body. theyve been recommended as a bit of a nissan specialist who do in-house component mods.

the positive is, its just $1000 more than a replacement USED gearbox.... which i see as the better option

[t5iv]

Definitely better value for money if that's the case considering that you're getting the Transgo kit which is at least $600. So in reality, you're only paying $400ish for a reco-ed box.

[Deep Dish V35]

another note: have researched the re4r01b gearboxes, turns out the ones fitted to the VQ motor has different input/output shafts to the RB version, plus the bellhousing..... so you cant assume that all those gearboxes will fit

[Howaitonaito]

Obviously......but the internals are similar. Only minor computer changes and what not.

[Howaitonaito]

And the model code wasnt that hard to find........its on the build plate right under the engine code. Like on every other Nissan

[Deep Dish V35]

in my 20 years of driving, ive only ever built classic cars which never had a trans code on the vin plate.... this is my first lemon gearbox in a new car

[NORBY]

manual swap time? Or enjoying the auto?

[Deep Dish V35]

manual swap time? Or enjoying the auto?

hahaha nooo..... i have a history of converting my manual project cars to auto...

[Howaitonaito]

If i had money i would do this engine and gearbox conversion and sell you my perfectly recently service four cog box

[Deep Dish V35]

heres the diagnosis...

upon disassembly, the guys found that the first clutch drum had failed. the friction plates should be retained by a large circlip - that clip had popped out, allowing the friction plates to travel past their correct location and eventually shave themselves down to nothing. this generated extra heat and extra load within the trans. The trans fluid in the pan looked like glitter paint.

The 4 speed auto has only 5 friction plates in there, mine has now been upgraded to the turbo version 7 plate and drum assembly.

the servos have also been discarded and replaced with new larger units from a turbo assembly.

the solenoids have all been replaced for new

the torque converter has been stripped down and rebuilt with all new internals

and lastly, the valve body has had a custom upgrade (not transgo.... apparrently his are better)

all this , including R and R, and a weeks labour.... $3050

The trans guy say this is THE way to upgrade the RE4R01B 4 speed auto box. In my opinion it is too much money to spend on a V35 upgrade unless youve already broken it, however it works out to being only $500ish more than buying and installing a second hand box from a wrecker..... so definitely better for the money.

Will upload a vid to show the improvement next week

[t5iv]

For that extra $500 you're getting a beefed up upgraded box as opposed to a normal one with unknown wear and tear. Damn good value if you look at it like that.

[Deep Dish V35]

under instruction from the trans builder, i am not allowed to use full throttle until after 1000km and a re-check... so here is a short clip of about half throttle from standing start. thanks to my back seat passenger

http://img.photobucket.com/albums/v716/sc850/V35/29A00525-E317-4F2A-9661-AE7C61D1A149-5894-000007E3A7B0C254.mp4

First to second... is quite grabby. Probably too harsh for my liking... we'll see if it eases up after bedding in...

[scotty nm35]

I doubt it will get any better. Sounds like they bumped the line pressure a little too high. Not hard to fix but the valve body has to come back out.

[PN-Mad]

ESpecially if that's 1/2 throttle. Wot should see the ecu demand higher line pressures.

[Deep Dish V35]

can the pressure adjustment be reduced for just the 1-2 gear change? the other changes feel just right

[PN-Mad]

As Scotty said- via the valve body.