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rich ullsmith:
Any 700r4 tranny guru's out there?

Can damage result when using a 700r4 in overdrive when the TCC is not operating? Bought an 87 unit that was, as far as I could see, quite solid.  Was went thru, new converter, shifts great. But the TCC will not engage with the car in gear, and chocked to prevent moving.

Put juice to the correct pin, but nothing. Does it also need to go thru the high gear pressure switch?

rich ullsmith:
Also, I should have asked: how much slippage am I incurring at 60 mph, @ 1900 rpm? Is that worth 1 mpg? or excessive heat in the converter?      Thanks for the help    Rich U.

Shark Racer:
Is the new converter a lockup converter?

The 700R4s will not get full fluid flow until lockup, so depending on the size of the vehicle there MAY be trans damage. If you're pulling a lot and the pump is never flowing full, you could easily overheat the fluid and when that happens transmission damage (clutches and whatnot) are soon to follow.

As to how the lockup mechanism works... not too familiar. There are lots of forums that will likely know the answer to that one.

passthebuck:
I had the same problem this past August on a one year old rebuild. Ended up being the lockup solenoid and was a super easy fix. I diagnosed it by removing the part and putting compressed air to the plunger while checking for continuity at the same time. Take your bad solenoid to a trans shop & they'll sell you what you need.

I too was stressed about hurting my trans because mine failed 60mi into a 120 mile drive. My trans guru said it wont hurt it at all to drive in 4th without the converter locked but it will obviously waste more gas.

Good luck & let us know how it goes.

rich ullsmith:
Well, it turns out I do not have a lock up converter. The tranny guy says, thru another party, that appropriate steps in the pump have been taken, so it gets fluid everywhere.  In all respects, the trans works great.
So, my final question, (I swear) is: What does the non lock up converter cost me in MPG, and is it worth converting?   I might add, next year I intend to put 15,000 miles on, half on freeways.   Thanks for the help.    Rich U.

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