1985 Renault Trafic Gearbox

[Jobless]

Hi Guys,

My Step-Mother has bought a 1985 Trafic T1000 Camper with the 1721cc petrol engine, the gearbox is screaming in 4th and 5th whilst accelerating.

My question is, did any other models use this box? I ask because its proving difficult to track one down. I know the engine was used in the Renault 21 and that too is longitudally mounted and FWD, is it the same box?

Thanks in advance.