P38A Yip... The gearbox.

Mark Piercy · Jun 20, 2020

Well, it is nearing the time to smash the piggy bank and soon source myself or rebuild my tired gearbox..
First thing when it's cold it hackles in reverse.
The rest of the day it's fine..
Oil level is good and clean.
Changed last March, two oil drops and the filter was done 10.000mls ago.
At 217.000mls I'm just a little concerned.
I would like to rebuild the box but km wandering seriously about a recon or a secondhand unit... < not my first choice...

marjon · Jun 20, 2020

Get a secondhand and rebuild yourself, take your time and learn on the way. Then change at a convenient time then your not off the road.

J

Datatek · Jun 20, 2020

Mark Piercy said:
Well, it is nearing the time to smash the piggy bank and soon source myself or rebuild my tired gearbox..
First thing when it's cold it hackles in reverse.
The rest of the day it's fine..
Oil level is good and clean.
Changed last March, two oil drops and the filter was done 10.000mls ago.
At 217.000mls I'm just a little concerned.
I would like to rebuild the box but km wandering seriously about a recon or a secondhand unit... < not my first choice...

Lucas Transmission Fix may help. I have a good working HP22 you can have if you want to help rip it out of the car

Henry_b · Jun 20, 2020

If it is slamming into gear, it might be worth dropping the valvebody and cleaning it out..

However i'd drop some Lucas stuff in it too.

RangeRoller dt · Jun 20, 2020

Doesn’t sound on its last legs if it’s fine most of the time.
+1 get spare, rebuild to hearts content and never worry about thrashing it off-road when you have an extra one waiting.

Grrrrrr · Jun 20, 2020

HP24 ready for the new chip.

Mark Piercy · Jun 21, 2020

I did try the lucas slip, it then started shunting into third gear... I've since drained it out and got the smooth changes back... But the reverse problem has slowly gotten worse over the last three years.
It's the idea of being where if it gives up.
All forward drive is unaffected cold or hot, just reverse noise when cold...

Mark Piercy · Jun 21, 2020

Datatek said:
Lucas Transmission Fix may help. I have a good working HP22 you can have if you want to help rip it out of the car

Errr, I may take you up on that

Datatek · Jun 21, 2020

Mark Piercy said:
Errr, I may take you up on that

You are very welcome

Mark Piercy · Jun 21, 2020

Datatek said:
You are very welcome

And you are very thanked

Lukas018 · Jun 21, 2020

Is this a gearbox on p38 Mark?

RangeRoller dt · Jun 21, 2020

He has a souped up M51 with an autobox.

Mark Piercy · Jun 22, 2020

Lukas018 said:
Is this a gearbox on p38 Mark?

It is indeed @Lukas018, The 4hp22.
My only concern about rebuilding mine or another box is getting parts I may need that are not available.

Datatek · Jun 22, 2020

Mark Piercy said:
It is indeed @Lukas018, The 4hp22.
My only concern about rebuilding mine or another box is getting parts I may need that are not available.

All the parts should be available, plenty of places doing rebuilds still.

Lukas018 · Jun 22, 2020

Mark Piercy said:
It is indeed @Lukas018, The 4hp22.
My only concern about rebuilding mine or another box is getting parts I may need that are not available.

Oh crikey, sorry to hear packing up mate.

Mark Piercy · Jun 22, 2020

Lukas018 said:
Oh crikey, sorry to hear packing up mate.

It still what it says on the tin, just a little noisy in reverse when cold but all good when it's warmed through.

Henry_b · Jun 22, 2020

Have you ever had any deposits in the sump?

It is very well known that clutch debris blocks the valvebody and solenoids rough changes are the first indicator..

eventually it'll start to flare when it changes..

Dropping the valvebody is quite simple, a chap on utube does it..

I've had to do it on mine

the 4p24 isn't immune to the issue either!

Mark Piercy · Jun 22, 2020

All reasonably clean on the oil drops and never anything alarming in the tin our 'enners.
Just the hackling noise when cold only and in reverse. The rest of the time when warm, it's a good.

Henry_b · Jun 22, 2020

Mark Piercy said:
All reasonably clean on the oil drops and never anything alarming in the tin our 'enners.
Just the hackling noise when cold only and in reverse. The rest of the time when warm, it's a good.

Indicative of low line pressure when cold, more than likely valvebody related Mark

next time the pan is down check the bolts that secure the valvebody and make sure they're all tight

Could also be the reverse gear safety valve faulting, this is more of a squeak though!..

Datatek · Jun 23, 2020

Mark Piercy said:
All reasonably clean on the oil drops and never anything alarming in the tin our 'enners.
Just the hackling noise when cold only and in reverse. The rest of the time when warm, it's a good.

No chance that the parking pawl is not fully disengaging I suppose? Worth puling the lever down to 1st and then back to reverse to see if it makes a difference.

P38A Yip... The gearbox.

Well fumbled member....

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Think outside, no box required.

Well-Sprung Member

Technician, Bodgit & Scarper Ltd

Well fumbled member....

Well fumbled member....

Well-Known Member

Well fumbled member....

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Well-Sprung Member

Well fumbled member....

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Well fumbled member....

Think outside, no box required.

Well fumbled member....

Think outside, no box required.

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