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Originally Posted by Rafe LORHO
Hello everybody,
I've got a slight problem with the functioning of my TH400. Here's what happens:
When cruising not very fast at 40mph, the tranny stays in 2nd.
If I accelerate to over 50 and then back off the throttle, the tranny goes into 3rd.
However, if I let the speed drop under 50 (49 / 48 / 47 mph) the tranny will start "slipping". It "slides" constantly between 2nd and 3rd and is rather annoying to drive.
Considering that before I modified my motor, I could cruise easily in 3rd at 40 mph. (Of course if you "floored" it would kick down.)
Apart from this above mentioned problem, the tranny seems to work OK everywhere else - nice tight gear changes when accelerating hard etc…
If anyone has an idea, I would be most grateful as going around town in 2nd all the time is starting to bug me. (Not to mention the extra fuel costs!)
Regards,
Rafe
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Doe the trans hold 3rd gear without slipping and under load once it finally shifts???
If so.............
First, I would check the modulator to make sure it is hooked up to the proper vacuum source (manifold vacuum) and that there are no leaks in the supply to it.
If that checks out, then pull the governor cover and remove the governor to inspect the gear teeth. If they look good, then put it back in and replace the modulator.
It sounds like by what you indicate, that the trans operated OK before the engine mods.....chances are, if things were unhooked, that maybe they didn't get re-connected properly..............