Originally Posted by derf
As it was going in for its big 100000 service I decided while the ford guys were at it the auto tranny fluid may as well be replaced. Up till then It had no problems, no mystery noises at all.
600 klms later not all is well, now it seems that there is an issue with the converter, something or another fell of it which enables it to make realy cool sounds when its placed into a gear. I noticed that when it came back it wouldnt kick back to first as regualy as it did pre oiling.
related issues or just unlucky timing?
Just unlucky timing.
The Ford recommended Automatic Transmission Service is; AS REQUIRED
I reckon this is way too long, by that stage the trans fluid has lost most of the additive package the viscosity has increased to a usafe level & the filter is pretty well blocked.
In the fine print, Ford recommend; Severe service
Drain & Refill at 50,000km.
The AU III & BA recomendation is 100,000km & Severe service 45,000km.
Severe service is described as; continuous stop start driving of less than 15km, high speed towing & a few other things.
The oil in your trans was probably very thick, this thickness was masking the effects of worn parts such as; solenoids, bushes & bearings. The new oil having the full additive package of deteregents & other things and being thinner (as it should be), has cleaned all the gunk from the worn parts.
The bearing in the torque convertor has probably worn through the case hardening and is producing a noise that sounds like a gear drive, rear bush in the extension housing is worn were the tailshaft yoke fits & is clucking, and one or more solenoids are leaking.