yes, it does help with the transmission on my car too. You could also get a stick-on heating pad and stick it onto the transmission instead of the oil pan. I had one on the oil pan on my old motor, since there was not a block heater and it was too hard to put one in. The pads come in several sizes, stick on well, and come with a tube of silicone sealant to seal the edges so it won't get oily and start to come off. I got one for about $40. I can't remember who makes them, only that they come from a place in Wisconsin. I just googled engine block heater to find them.

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andy t
'78 300d
'95 volvo 850, wagon
'86 300sdl - engine out, maybe I'll have it rolling by June

whole bunch o' bicycles