Hi all. Sorry if this question has been posted before but it's such a "fuzzy" problem that I'm not sure how to find any info on it. I have a TH400 behind my 455 that has been working great what little I have been driving the car up until this year. A couple of months ago I found out that the car is street legal which means that I have been pounding on it quite a bit since then. Full throttle accelerations, burnouts, donuts, you name it. As of lately it seems as if the transmission "slips" a bit. When cold it takes 5-10 seconds before reverse engages and then it does it with a "thunk" and a judder. In drive, even when it's somewhat warm, the transmissions behaves as if the clutch was worn out and just loses the drive to the rear wheels - and especially if I accelerate when turning. I have checked the transmission oil and it seems to be on the mark. Any ideas on how to troubleshoot this further? o No: TIA.
Usually when they slip, it's time for a rebuild. You can check the vacuum modulator though. Make sure the vacuum line is not broken or crimped. Take the modulator out and make sure the diaphram is good. It should hold vacuum, and there should be no ATF on the vacuum side.
ATF = Automatic Transmission Fluid (or oil) You do check the ATF level with the car running, after you've driven the car, right? -BC
And the trans fluid should be a happy, bright translucent red. Darker colors, often associated with a "burnt" smell are a sign that clutch slippage has overheated the fluid...i.e. time for an overhaul. Sometimes low pressure can be caused by a restricted trans filter, so it might be a good idea to do a filter/fluid replacement before digging in further. Devon
When the engine isn't running, fluid drains back into the pan raising the level. The level may be low with the engine running.
