Re: OT GM 700R4 Tranny problem

Posted by jdemaris on March 04, 2007 at 06:21:46 from (66.218.13.51):

In Reply to: Re: OT GM 700R4 Tranny problem posted by Allan In NE on March 03, 2007 at 08:38:03:

Cost about $80 and uses centrifugal flyweights (I think). It's all self-contained and plugs into the modulator port - but I don't know exactly what it looks like internally. I think it has a cable hooked to it - but since I've never had a problem, I've never had to look too closely. If you ever drive with one, it seems kind of odd at first - but after owning two of them, I prefer it over vacuum-modulator setup. Always shifts at a precise RPM.
It does not "load sense" like a gas-powered TH400 hooked to engine vacuum. But . . . a OEM diesel - even with the vacuum modulator - does not "load sense" anway. It uses a variable-vacuum simulator on the injection pump that simply varies available vacuum according to throttle position.
My 83 Chevy deisel plow truck - was converted years ago - from the orig. 700R4 to a TH400 with the mechanical modulator. Since then, I acquried a 86 with the same set-up. But . . . I personally have never installed one - just own and use them. And, see them for sale - most transmission parts places sell the "mechancial modulator" as a HD option.

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