In and earlier thread, I posted about the used tranny slipping when it was installed. The Salvage yard sent me a can of BG transmission additive gratis. Said I will need to drive it a day or two to see improvement. Takes off in first just fine, but when it moves to 2nd and 3rd, there is a hesitation before it engages. Could this possibly be the modulator. If so, how difficult is it to change. I still have the one off the old tranny.

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1978 300CD
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Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John

If it's slipping it's probably toast. I would still try messing with the modulator to make the best of it, if you use the adjustment on the modulator you can stiffen up the shifts to make up for slippage. Assuming it really is slipping, not sure what you meant by "hesitation".