Your probably gettin tired of my trans questions but let me just ask a couple more.

History:

85 300TD with a new ( reman) trans one year ago. Purhcased in California and brought to Utah so no call backs to the trans shop available to me. Trans ran fine no complaint by the previous owner.

Under hard acceleration or going up hills ( under torqu load) the trans shifts fine as it should.
On down hill or at low RPM and no load I get hard ( neck popping) shifts..
Indy shop tell me that it is 95% bowden cable adjustment...


What I have done. Checked all vac lines and adjusted bowden cable ( 50 times).. again highway speeds no problems.. runs great.Found what I feel is the sweet spot. The pnly problem is no load shifting or coasting. When it shifts it does so real hard.
FWIW: had to replace a center bearing which should have no affect on shifting.

anyone care to give me an opinion as to why the hard shifts under no load or light load? Do new trannys just shift hard until break in?

I'll be thankin ya..

Bennett

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81' 240d 4 spd 140k on the clock

You must have no vacuum or minimal vacuum getting to your modulator. Worst case, somehow your valve body is not responding to the correct vacuum signal - but - since you have a rebuilt tranny I would not sustpect this first.

From what I know, the car shifts 'well' under heavy load because if the vacuum system was working properly, the modulator would see no vacuum anyway - the VCV (lastic thingy on top of IP) would vent it all out. That's what the system is meant to do.

I would start with verifying that your vacuum modulator can hold vacuum. Maybe you have already done this. What have you done?>

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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car

What's the vacuum from the VCV to the modulator at idle?