Torque Convertor, is it going bad or is it something else? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 10-01-2003, 12:33 PM
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Torque Convertor, is it going bad or is it something else?

Ok,
Now for a new problem, over the weekend I installed a shift kit in my tranny it's a TH200-4r, it was the B&M Transpak, I was trying to eliminate the large RPM loss on shifts, if I held it to 5000rpms, when it shifted it would drop 2000rpm's, the problem with that was it was like it was dragging on the clutches before engaging. Well, now the tranny in OD holds all gears to at least 3000 before shifting and second gear holds to almost 4000! If I manually go thru the gears its better but still holds the gears to long. Also, when decelerating it automaticlly downshifts into second at around 30mph wether I want it to or not. I also have had a whine kinda like if I were running a gear drive since I had this car. Would the torque convertor be causing these problems or is it the tranny that's the problem? Please help!

I have tried adjusting the TV cable and moving it around if I go in it holds the gears even longer, as I loosen it out 1st and 2nd still act the same way but 3rd and 4th do an almost instant shift.


August

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Old 10-01-2003, 01:17 PM
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I don`t think the torque converter is the problem, however, a shift kit isn`t going to help the loss between shifts, the gear ratio of the tranny dictates that, example is if you hold it to max rpm then shift, the engine holds the RPM until it shifts, the rpm drop will be whatever the next gear ratio is. that`s why most don`t like the 700R4, it`s 1st gear ratio is in the 3:1 area and 2nd gear is in the 1.50:1 area so a big loss goes on between gears. if your sure you`ve adjusted the TV cable properly, then I`d say something else is amiss in the valve body that`s preventing it from shifting as it should.
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Old 10-02-2003, 08:05 AM
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DoubleVision,
Thanks for the reply, what I was I trying to say was not the rpm drop but the way it drops. It's kinda mushy on the shift when it changes gears. What's wierd is that it holds the gears longer under light acceleration vs hard acceleration in OD or D, accordinfg to the instructions those gears should produce a normal shift pattern. I talked to B&M again and they say it might be the governor, I would like some more informed oponions before I tear inot the tranny again. Again thanks for the info.


August


P.S.
I went thru the knowledge base last night and while some great info there none had my problem.
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Old 10-02-2003, 12:21 PM
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That whine, if it's in the transmission could be a failing front pump, they get pretty noisy after high mileage or ingesting allot of shrapnel from a failing converter.

Shift kits rarely net much of an ET gain, their purpose is to extend clutch life, lower fluid temp in a "heavy duty" application.

Was the fluid pretty dark in color or burnt smelling when you drained the trans to install the shift kit? How much metal was in the bottom of the pan? More than a teaspoon full and it't time for a re-build!
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Old 10-02-2003, 02:49 PM
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Goldduster360,
The whine is definatly from the tranny not from the rearend, in park if you rev up the engine the whine increases with the Rpm's. On the fluid, like an idiot I had the fluid changed aout a month ago then I decide to put the shift kit in . As for metal in the pan I did not see any although I had a lot of black gunk that I cleaned off of everything. If the front pump is failing would one of the symptoms be the whine that sounds like a gear drive? Would it be better to replace the convertor and the pump or are they seperate units or one unit? I still learning about trannies so forgive if these are somewhat of a stupid question.


August
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