[DeTomaso] ZF gears don't engage properly

[Patrick HALS]

I immediately start by apologizinge for my poor technical wording , Folks !
Here is the problem:
My mechanic has fitted a second hand ZF DS2 gearbox in a Pantera.
Everything works fine when the engine does not run, all gears engage and
disengage freely.
The clutch is new and works fine, engage and disengage. the pedal is
normal, and you can see it moving through the window in the bellhousing.
The gearlever is well centered in the tunnel in the cockpit
Strangely, when the engine runs, it is impossible to engage any gear
properly.
If you start the engine with a gear already engaged, and the clutch pushed,
it works fine, the wheel is not rotating.
If you release the clutch, the wheel turns normally, and the gear can be
disengaged normally, but a new gear can not be entered, as the teeth are
hitting each other in the gearbox
Someone told me that maybe , the oil in the gearbox was not correct, or
that the level was not sufficient .
Does that make sense ?
Thank you
Patrick
Candy 2862 ( still missing )
ADA 9628
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   I immediately start by apologizinge for my poor technical wording ,
   Folks !A
   Here is the problem:
   My mechanic has fitted a second hand ZF DS2 gearbox in a Pantera.
   Everything works fine when the engine does not run, all gears engage
   and disengage freely.A
   The clutch is new and works fine, engage and disengage. the pedal is
   normal, and you can see it moving through the window in the
   bellhousing.A
   The gearlever is well centered in the tunnel in the cockpit
   Strangely, when the engine runs, it is impossible to engage any gear
   properly.A
   If you start the engine with a gear already engaged, and the clutch
   pushed, it works fine, the wheel is not rotating.A
   If you release the clutch, the wheel turns normally, and the gear can
   be disengaged normally, but a new gear can not be entered, as the teeth
   are hitting each other in the gearboxA
   Someone told me that maybe , the oil in the gearbox was not correct, or
   that the level was not sufficient .A
   Does that make sense ?A
   Thank youA
   PatrickA
   Candy 2862 ( still missing )
   ADA 9628