Auto Box Problem (sometimes Getting Stuck In 1st)

[SECURITY]

the problem is when the car gets stuck in 1st gear and wont shift to 2nd unless it revvs rigth through to almost redline (or with the r33's, push the snow button).

well ive read around about the auto boxes and so far ive gathered the following:

- even after a gearbox change, the problem still exists.

- could possibly be electrical, but noone knows for sure.

- or this:

when i sent my crank off to get machined, they told me i need a new crank because my thrust bearing was worn over the 5 thou limit.. it was at 20 thou!

when we put my car back together the first time we noticed the oil pressure to be a bit low (too low).

even after being warned by my bro in law (mechanic) that there was a problem, i still insisted on taking it out for the weekend and checking pressure later. i drove quite a fair bit, around 250k's that weekend and noticed that i got the sticky 1st problem more regular than usual (from once every few days, to 5 or 6 times in that day).

i was just thinking that they were related because the problem got worse as the thrust bearing got worn away from the low oil pressure (and on the autos the crank is connected to the torque converter).

i dont know how the torque converter works, but i was told that i may be right.

thats why i came here...

let me know what you guys think and if the problems could be related.

[predator]

Sure it's not the shifter mechanism itself? That would explain the box change not fixing the problem. Or a problem with the shift computer? Have you swapped in a spare transmission computer to check?

To me it could be a heat related if you drove it for a long time and it got worse. Unless possibly the computer adapts its shift mechanism based on the engine oil pressure ? (but I don't believe it does). The computer also goes off pressure and temp sensors on the auto as well.

Auto thrust bearing? Don't you meant the spigot bush? That is what goes in the back of the crank, and the auto shaft goes into.

[BreathLess]

i would like to know whats causing it also as mine just started to do this?

[**JaR**]

yeah my old gearbox used to do that, i found if i just took my foot off the accelerator, then hit it hard again it'd change but i still didnt know what it was but the new gearbox hasnt given me troubles since ( had to change the old one coz reverse gave way in it )

Edited May 30, 2006 by **JaR**

[SECURITY]

the only reason i'd tie the thrust bearing to it is before my 1st build it had little movement and it would get stuck on occasion.

when i went with the oil pressure problem it got worse.. and eded up having alot of movement... so i figured the problems could be tied.

im not sure how it works, but the torque converter sits on the back of the crank in the autos (i think). maybe its got to do with that?

[SECURITY]

well im still getting this problem.. sucks major ass.

would over-filling the gearbox oil have an effect on getting stuck in 1st? when i had the oil changed they over filled it by a fair bit which i just noticed now.

[MacGuyver]

I've only just encountered a similar problem to this as well, only my car gets stuck in 2nd. When I take my foot off the breaks from stand still (like at a set of lights) the car doesn't move forward like it should, and when it does take off it starts in 2nd and doesn't move. Poor value!

[Trust33]

i had a similar problem in my auto gemini.Caused thrugh shifting manually and thrashing the living end out of it....When taken to a transmission specialist on mulgoa road penrith (cant remember name) they said that it was a blocked actuator valve.that or some other sort of valve that enabled the shifts were blocked.

Basically it would only shift at the high rpm range.

[SECURITY]

is it the valve body?

i was going to take it out and give it a clean when i had a chance. i'll let you all know how that goes.