> From: Andy [SMTP:adixon@loudoun.com]
> Sent: Wednesday, June 03, 1998 5:05 PM
>
> Can't say much about my present TR6, it's merely a shell (and a rusty one
> at that). But my previous one did not appear to drop out of overdrive
> between 3rd and 4th.
>
I am not clear on what you mean by this. During normal shifting, my car does
not *appear* to drop out of O/D either. What I mean is that when I have the
O/D on and I am in 4th, I can downshift to 3rd and the O/D appears to stay
on. Likewise for the 3rd to 4th shift. I say appears because although there
is no discernible jerk as the O/D dis-engages and re-engages when the
gearbox is put in gear, I know that the solenoid loses its power for the
brief time the gear shift lever is in between gears. The shift does appear
to be smooth however. If I didn't have the O/D indicator in my car, I would
not know that the solenoid was briefly losing power.
I pressure tested my O/D recently during just such a shift sequence and the
normal pressure of my O/D is 470psi when engaged. During the shift the
pressure briefly dropped to 450psi and then shot back up to 470psi. I guess
that the drop to 450 is not sufficient to dis-engage the O/D. (When the O/D
is off the pressure is about 15-20psi).
So two possibilities why your O/D appeared to stay on are: either your
previous TR6 had a different switching mechanism than mine or you were
simply not aware that the solenoid was losing power but the O/D remained
engaged. It could also be something I have not considered. FWIW, my car is a
stock 76 with the factory J-type O/D.
I won't be able to do any more testing on mine until the weekend but I am
really curious if maintaining the power to the solenoid on during the 3-4
(and 4-3) shift will remove the grind (I only get the grind on the 3-4
shift, with O/D on).
Peter Zaborski
76 TR6 (CF58310 UO)
Calgary AB Canada
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