What weight oil for NP435?
Hi guys, I have a Ford 5.0 bolted to a Ford NP435 tranny. What weight tranny oil should I be using? I'm using SAE 50 right now, but the rear lower cover of the NP435 is leaking a bit, and I noticed that once the tranny gets nice and warmed up the oil seems a bit thin...I don't want to damage anything!
Also, the tranny makes noise as it gets up to speed, and I'm wondering if that is a side effect of too thin oil? It makes a sort of loud hum and it gets louder the faster you go. Doesn't go away until you competely stop and it makes the noise regardless of the clutch being in, shifter in neutral, etc. Anybody else have an NP435 that is a bit noisy...maybe it's normal? Thanks for any advice!