P38A torque converter lockup

kermit_rr · Mar 21, 2020

Henry_b said:
Be aware that if the box isn't slipping putting lucas in it might cause hard/harsh shifts..

That oil looks fine too me..

Better than this..

It's not slipping, but i understood it would cure the hard shift from 1st to 2nd

Henry_b · Mar 21, 2020

kermit_rr said:
It's not slipping, but i understood it would cure the hard shift from 1st to 2nd

It might do the opposite..

kermit_rr · Mar 21, 2020

Ok now I'm stuck! Some folks say it's a good thing, marketing on the bottle says it specifically sorts hard shifting and is generally good for an old box like mine.
Although i don't know if it's ever been replaced/rebuilt etc the dash shows 125,000 miles

kermit_rr · Mar 21, 2020

Leaving it for now, apart from anything else the box is cold and it's supposed to go in hot!!

Henry_b · Mar 21, 2020

It works on completely ****ered Gearboxes that're slipping, but in my experience it will cause harsh shifting if there isn't an element of slip in the box..

I added a bottle to my D2's trans and it was never the same.

kermit_rr · Mar 21, 2020

Henry_b said:
It works on completely ****ered Gearboxes that're slipping, but in my experience it will cause harsh shifting if there isn't an element of slip in the box..

I added a bottle to my D2's trans and it was never the same.

Maybe i should invest in another oil change. Like you said, it looks good, but still darker than new oil.
Maybe that will help the sticky valve? Don't really want to strip the valve block, although something like that I'd farm out as i don't have the time

Henry_b · Mar 21, 2020

kermit_rr said:
Maybe i should invest in another oil change. Like you said, it looks good, but still darker than new oil.
Maybe that will help the sticky valve? Don't really want to strip the valve block, although something like that I'd farm out as i don't have the time

The best course of action is to remove the solenoids, and clean them out

There is also a metal mesh filter in the solenoid section that houses the main pressure regulator solenoid.

It gets clogged up with clutch material that can also cause harsh 1-2 shifts.

I had to drop the valvebody on mine and clean it out.

Datatek · Mar 21, 2020

Henry_b said:
It works on completely ****ered Gearboxes that're slipping, but in my experience it will cause harsh shifting if there isn't an element of slip in the box..

I added a bottle to my D2's trans and it was never the same.

Lucas stopped the flaring on 2nd to 3rd shifts on mine due to sticky solenoids, there were some occasional hard shifts for a while.

kermit_rr · Mar 21, 2020

Well the oil i siphoned out is now back in. I've got drive, though spilled a little bit. Oddly, 1st to 2nd seems smoother... I've not done anything...

Datatek · Mar 21, 2020

kermit_rr said:
Well the oil i siphoned out is now back in. I've got drive, though spilled a little bit. Oddly, 1st to 2nd seems smoother... I've not done anything...

Did you do the level check correctly?

Henry_b · Mar 21, 2020

Datatek said:
Lucas stopped the flaring on 2nd to 3rd shifts on mine due to sticky solenoids, there were some occasional hard shifts for a while.

Yes it can fix flaring, however if it is added to a heathy box as a "just in case" measure, it causes hard shifts..

If there isn't an element of slip in the box.

Datatek · Mar 21, 2020

Henry_b said:
Yes it can fix flaring, however if it is added to a heathy box as a "just in case" measure, it causes hard shifts..

If there isn't an element of slip in the box.

The only slip in mine I'm pretty sure is due to sticky solenoids, if the clutches were slipping the box would have died ages ago with the towing I do.
I have an HP24 to fit when I can pluck up the courage.

kermit_rr · Mar 21, 2020

Ok that was me just overthinking things, seems pretty much as normal. I suppose i needs a valve block clean etc to get it 'right'. Will fresh oil make any difference?
It will be marginally low now, by a few ml at most.
I can't remember what i put in last time!!

Datatek · Mar 21, 2020

kermit_rr said:
Ok that was me just overthinking things, seems pretty much as normal. I suppose i needs a valve block clean etc to get it 'right'. Will fresh oil make any difference?
It will be marginally low now, by a few ml at most.
I can't remember what i put in last time!!

Oil level is checked cold with the engine running after running slowly through all the gear positions.
If you have not done that, the oil may be very low.

kermit_rr · Mar 21, 2020

Datatek said:
Oil level is checked cold with the engine running after running slowly through all the gear positions.
If you have not done that, the oil may be very low.

Does it matter if you mix atf? Really cent remember what i put in

Datatek · Mar 21, 2020

kermit_rr said:
Does it matter if you mix atf? Really cent remember what i put in

As long as it's all Dexron 3 should be OK.

Henry_b · Mar 21, 2020

Mixing brands doesn't really matter so long as it is the same DEX number

kermit_rr · Mar 21, 2020

Aha found receipt for 10L dex3

Mark Piercy · Mar 22, 2020

I change the g box oil every year,
I added Lucas to mine and get an occasional thunk from 1-2 gears since doing so.
I do around 15.000-20.000mls and a touch of off roading, so it gets a little more than normal use.

kermit_rr · Mar 22, 2020

Mark Piercy said:
I change the g box oil every year,
I added Lucas to mine and get an occasional thunk from 1-2 gears since doing so.
I do around 15.000-20.000mls and a touch of off roading, so it gets a little more than normal use.

Do you just change what's in the sump?
How do you actually get the new oil back in? I ended up siphoning in from the top of the engine bay

P38A torque converter lockup

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