Gearbox code difference

[Goldylox]

Hi there, my gearbox blew up from my Transit based hymer .
The former owner replaced the engine with a 2.5TD from a transit from 1993 so a MK4

Now, the gearbox code on the one i have is 88VT-7006-AA and now i’ve found one which they have done up but has the code 88VT-7006-AB

So what would be the difference with the AA or the AB version?

I’m based in Holland and the parts are harder to find .
I’ve seen gearboxes with the same code but then they would have to come from Poland , Estonia France or Spain and then i dont know what i’m getting .
The one in Holland is refurbished but annoyingly with AB on the end instead of AA

Can someone help me please .
Want to get my camper back

[Altransit]

So far as I'm aware, those last two letters are updates on the original numbers, therefore AB is an update to AA, and AC would be a later version again etc.

[Goldylox]

Thank you for your quick answer.

[Goldylox]

So I have changed my gearbox even though it had the last two digits different .
Works well but does leak still a bit .
I guess the gearbox oil is very thin and they did fill it up to the brim.

[knobby1]

So I have changed my gearbox even though it had the last two digits different .
Works well but does leak still a bit .
I guess the gearbox oil is very thin and they did fill it up to the brim.

Oil shouldn't be too thin, it should be 75W80 gear oil.

Lord Knobrot (Smithy)

[Goldylox]

I used the Kroon-oil SP1031 made for these gearboxes .

[knobby1]

I used the Kroon-oil SP1031 made for these gearboxes .

The Ford spec for the oil is WSD-M2C200-C which is basically 75W90/75W80 GL4 Synthetic.

I use Redline 75W90 in mine.

Lord Knobrot