To answer your question, a couple of questions first....Originally Posted by agr071
1. Is there a real delay (I mean more than 2-3 seconds ) in between selecting reverse and the box actually going into reverse? We used to work on anything up to 3-4 seconds being tollerable/OK, but with your idle RPM it should be reasonably quick into reverse due higher oil pressure.
2. When you say "clunks" into fwd or rev gear, do you mean it goes in hard (but is quiet) or just goes in normally but makes a noise? Standard torque converter fitted or a small stall? Any decent amount of stall built into the converter should have the effect of making going into gear almost un-noticeable.
3. Have you had a good look at your flexplate/bolts, your unis, and the front yoke for spline wear?
4. Apart from those things you've mentioned does it drive normally - ie, on a downshift does it thump back from 3rd to 2nd as well? - On later types there was a small plastic valve fitted to the valvebody called a dump valve that commonly breaks and causes this.
5. The $64,000.00 question..... Starting on a hill.... Can you reverse up the hill at greater than about 1500rpm? That will tell you if the geverse clutch pack is OK or not. You'll know if it isn't....:nevreness:
Trimatic pumps are known for being a little whiny, but didn't affect the operation of the unit as long as the line pressures are checked every now and again and if they start to drop off get the tranny pulled.
Couple of areas for you to have a look at to at least make a start yourself. Most autos are a little erratic if they don't have either enough oil pressure or enough vaccuum.
The TH400 question: You'll never break it (though that said mine now has a leak in the pump or converter seal I am yet to get to or get fixed) but with the size and weight of the spinning mass in a TH400 they do suck a heap of power out it - flipside: the changes are silky smooth when cruising....
Regards,
Dave
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