Mopar Muscle Association UK

iknow this a mopar board but i thought i would ask anyway
i have in my mustang a c6 auto which was rebuilt last year car has stood for nearly 4 months two of which was outside when i started the car up and moved it a large pool of tranny oil was underneath it had not leaked all year ,so topped it up and drove it no probs, since last week when i took it to the ace cafe the car will hesitate to kick down and sometimes will not change up or even kick down no oil has dripped out and levels are ok ,have checked the vacum line no holes or leaks ,do i need to adjust the bands ,need a new torque converter ,vacum module ..or do i take it back to the builder ...gearbox was fine all last year could not fault it

Stick a 727 and a 3500 stall in it, that will wake it up

mechanicals covered/submerged in what i guess is clean oil don't tend to deteriorate when left standing (granted things can seize up or get blocked but you'd expect no change up or down action or it would slowly get better as whatever is stuck gets unstuck (especially as the pressures involved are high and sludge is sludge))

seals and diaphragms do

i'd start there with your vacuum switch
and also look for a clean wet bit to find out where the leak was from

don't think ATF is hygroscopic so humid and damp weather should not increase the level of your ATF to the point it runs over or out of a breather

1) it cheaper to check switches and vacuum pipes first and find the problem than go for a full fluid swap of further diagnostics

2) i guess the vacuum bit is responsible for kickdown based on manifold vacuum. so i'd check the brake booster as well. anything that affects manifold vacuum will have an effect on it. mind your car would run lean as well? any popping or loss of power?


sorry

think we really need Duncan or blue or john, guys who have worked on gearboxes extensivly to comment. my approach is always whats going to cost me the least, and that's switches pipes and seals especially when vacuum is involved as the wrong type of pipe is often used or it perishes and can't hold its shape

Dave