'93 Tempo Transmission Problem

Hi all!
I have a '93 Tempo with about 150k miles that has, up until recently, ran like a dream for a car its age. Back in January I took it to a Jiffy Lube for a
transmission flush, and a couple weeks later I started having problems.
I can drive the car for about 10-15 minutes (long enough for the transmission fluid to get warm) and then the transmission starts to slip badly, refusing to accelerate above 15 mph. If I stop and let it sit for a few minutes, it drives fine for 10-15 minutes and then the problem starts again. When the slipping starts, the speed guage flutters quite strangely as well.
I talked to a transmission specialist over the phone and, from my description of the problem, they are recommending rebuilding the transmission. Is there anything else this could be? How much should I expect to pay for rebuilding?
Thanks for your help/advice!
~Scott M.
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for a transmission flush, and a couple weeks later I started having problems.

badly, refusing to accelerate above 15 mph. If I stop and let it sit for a few minutes, it drives fine for 10-15 minutes and then the problem starts again. When the slipping starts, the speed guage flutters quite strangely as well.

transmission. Is there anything else this could be? How much should I expect to pay for rebuilding?

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Fully mechanical transmission, a symptom not part or cause of the problem.

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I don't think it's the speed gauge, as the car will really not go over 10-15 mph when the problem starts. I think the speed gauge is just a symptom of the problem. When it acts up, I can feed it gas all day and it won't go above 10-15 mph. All that happens is the engine revs very loudly.
I've checked around at a few different transmission shops, and I've been quoted anywhere between $550-1200 for the rebuild.
Here's a question: could it be a bad torque converter?
Ultimately, with a transmission that has 150k+ miles on it I'm thinking it probably just needs to be refurbished or rebuilt.
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Check the fluid level... top it off and see if the problem goes away.

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I did that in the beginning, and it made no difference. I even had a mechanic flush the transmission a second time for me to no avail.
I broke down today and got a used transmission for 150 bucks. Now I just need to find someone who can install it.
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Flushing an old transmission will kill it. Just do a drain and refill every so often and it'll be fine.

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It's possible it is just a governor problem, but it has to be checked out. The speedometer is cable driven. The cable is driven off a nylon gear that is driven by the same gear that drives the governor. Its a common failure and if it is only the governor and drive gear does not require a rebuild; only replacement of the governor, drive gear and speedometer gear.

transmission flush, and a couple weeks later I started having problems.

accelerate above 15 mph. If I stop and let it sit for a few minutes, it drives fine for 10-15 minutes and then the problem starts again. When the slipping starts, the speed guage flutters quite strangely as well.

anything else this could be? How much should I expect to pay for rebuilding?

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