Help - How to tell if the Auto box is slipping?

[nedb]

Hi guys, I have a R32 auto and I just bought a shift kit for it to improve the gear changes. I also bought some fancy RedLine Hi-Temp Trans Fluid to go with it?

The only concern I have is I think I can feel it slipping when driving but I’m not sure.

Also, once I was trying to warm up the tires a bit. I was holding my foot on the brake and pressing the accelerator pedal and the RPM's went up but wheels didn't move. I don't think I was holding the brake too hard.

Is there any way to really know if it's slipping or not, as I would hate it if I put this fluid in, just to find out it's all for nothing.

The RedLine stuff is about $120+ for less than 4L and I need at least 2 of those.

Any help will be really appreciated.

Thanx.

[racsov500]

trust me, its nowhere near as bad as my basher. does it just rev like a manual with the clutch down? (ie neutral) and then hop forward? Thats usually a slight indication of slippage

[DRFTR33]

what was happening when you had your foot on the accelerator and the brake was called stall speed, its perfectly normal

its the maximum speed the impeller can turn while the turbine is stationary in the torque converter

never do that for more than five seconds because the transmision oil get pretty toasty

what you have effectivly done there is perfored what is called a stall test

what you want to look for is if the reves flare up past stall speed

then you have a slipping transmision

also when your driving it hard if the revs shoot up all of a sudden and it doesnt produce any power thats the same thing

hope this was helpfull

[Abo Bob]

Also I use that ATF and that will make slipping harder to happen. Have you installed the shift kit yet? I take it not.

[nedb]

racsov500 - no, i don't get any hopping

DRFTR33 - I know about the stall speed. I think it's about 2500 RPM on a R32. I believe I was up around 4000 RPM and the wheels were still stationary. Also, when goin from 2nd to 3rd, once in 3rd it sounds like the revs go up and then die down. I'll do another stall test tonight and see how I go.

Adam - No I haven't installed it yet. I wanna make sure the gearbox is OK before I do so.

If the gearbox is slipping, is it as simple as replacing the torque converter or is there more to be done than that. The Auto gearboxes go arounds for peanuts.

Thanx for replies guys, very muck appreciated.

[r33skylinegtst]

I had a slipping clutch in my car, was a manual though. Did the same thing as yours, in third the car would rev high, die down and then build up again. clutch lasted like this for about 3-4 months before finally going.

[predator]

what DRFTR33 said..

when it slips.. basically it'll sit there free spinning for a while, before it changes into the next gear. So you'll notice the shifts are a lot more sloppy and slower than they should otherwise do. Mine does that on my R32..

If you have a really shagged auto box it will slip even under moderate load and if very bad even whilst driving fairly sedately.

I've noticed it's mainly if you're revving off at 7000rpm.. below that it's not too bad. I think with the turbo skylines, it's a case that the engine loves revving, but the auto box doesn't

[nedb]

Well last nite I went to warm up the tires and test the gearbox.

I was sitting there watching my RPM's and at 2500 it started pushing the car forward. At 3000 I applied more brake and it broke traction. Revs were not uncontrollably rising. I did 3 tests and I was happy with the result.

But then I went for a drive with full throttle just to cool the fluid a bit, and once I ran out of revs in second it wouldn't change to 3rd. It seamed like it was in 2 instead of D and it was hitting the rev cut. I let it cool down a bit and it worked fine afterwards. Weird.

Also, I get very loud popping out of the exhaust if I rev out in the first before it changes to second. It sounds like a machine gun but with a skyline note. :uzi: People usually think I can't drive when they hear it, and it always attracts a few puzzled looks. :devfu:

So I've decided to take my chance and install the kit on this gearbox and see how it goes.

I will keep you all posted.

Thanx for the input guys.

[Abo Bob]

It probably needs a good ole fashioned service. A proper auto transmission place should do it for about $100. You may have to tell them that its a Jatco just like the R31 aussie skylines had.

Get them to install the valve body while their at it and bobs your uncle. Shouldn't cost much at all. They will also be able to tell what kind of condition it is in internally as well.

[nedb]

Yeah I had a service done a couple of months ago. The gearbox is the same as the Patrol one.

They found a lot of metal grime and a 7 - 10 cm piece of dipstick on the bottom of the pan.