Whining Transmission

now i see the difference in the latest pcm 1.23 valve, they are using a larger regulator spring and counter boring the case larger to accept the spring, this should eliminate the buzzing noise completely.

89Nautique2001 wrote: TRBeng, I got the hose from my dealer. Does it install where the sending unit is? What do you do with the sending unit?

89, listen to Eric- hes the expert. I have the fix installed on my boat, but M3Fan was the one who put it on.

mjg, I think the sound youre hearing is the tracking fins. They seem to whistle as you make a turn, especially when slowing down. Its the shark-fin shape that does it, as the newer ('91+) squared off fins dont make any noise.

I installed the hose & can not tell any difference. How many years did they use these tranny's? What did they do to the newer ones to get them quieted down?

TRBeng, I got the hose from my dealer. Does it install where the sending unit is? What do you do with the sending unit?

M3Fan wrote: Tim, the PCM fix is to give the main valve body more volume to cure a very weird, loud buzzing/chattering noise caused soley by trans fluid under pressure in the valve body. Sounds like these guys are just talking about gear whine. The buzzing/chattering noise that the hose extension fixes sounds like an old rusty washtub on spin cycle, only at idle speed or idle out of gear. Once you power up, it's gone.

Gotcha- I forgot that you were the one who installed the kit. I didnt realize the noise was only at idle. Makes sense on the theory behind it- I figured it had something to do with decreased pressure with increased volume since the fix appears to consist solely of a 10" terminated hose!

This sounds like a problem thats typical on the very early 1.23 transmissions. My uncle had the fix performed on his '90 when it was a year or 2 old. My boat also has the kit installed to quiet it down. You can see in this pic- its the 10" rubber hose sticking out of the top:

your up early, they do have some early planeteries that whine, i have ran into this in the past with the 1.23's, your uncles 84 is probably a Borg Warner.
PCM's in forward will spin planetary gears causing the whining sound, I do have a ton of those planets from surplus trannies with low hours on them, you dont even want to go through PCM for that planet......it would be cheaper to buy a new trans.
The Borg Warners in forward do not spin plants because they are locked in the forward drum and spin with the forward drum, when you put them in reverse though you will here the planets creating the whine, the planet gears normally will turn 4 to 5 times engine speed and they are helical cut gears (at a angle)
the pcm's are repairable simply by swapping the planet

Was the wife on the boat? anyways if your sure it wasnt the wife we need to know exactly what trans you have, PCM? or Borg Warner?
Eric

Boat doc, went to the islands up to the redneck hilton (campground)got back late sunday, first time ive been relaxed in a while

same boat same year same problem