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Definitely not normal. The OD should shift positively at any engine power and
gear (except 1st & reverse of course); and not drop
out unless you flip the switch, turn off the key, or shift out of gear.
>From your description, I'd guess the OD hydraulic pressure is drastically low.
> Buy or build a pressure gauge (there is a special
adapter required) and check the reading. Unfortunately, you'll need to pull
the tunnel, but the good news is that the OD doesn't
have to come out of the car to check the pressure.
BTW, if I am right, then the OD clutch is slipping when it appears to drop out
of gear, and may even be slipping a little when you
don't notice. It's probably best not to use the OD until you can correct the
problem.
-- Randall
_____
From: Triumphs [mailto:triumphs-bounces@autox.team.net] On Behalf Of Rye
Livingston
Sent: Tuesday, October 06, 2015 8:54 AM
To: fot@autox.team.net
Cc: triumphs@autox.team.net
Subject: [TR] OD transmission
Looking for comments and suggestions.
I just installed a TR4 rebuilt overdrive transmission in my 1960 TR3.
Everything is running well and the OD is pretty cool. I
don't know what to expect or how it should work, but this doesn't seem right to
me. When I'm up to 60 mph or so and flip the
switch, it shifts into OD no problem. If I'm accelerating at the time, it
won't shift until I let up on the gas so there isn't any
load. As I experimented with this, driving down HWY 1 along the Pacific Coast
Highway, there are short rolling hills and as I am
going up the hill and flip the switch, it won't shift into OD until again I've
crested the hill and have let up on the gas a bit.
Now 3rd gear, I wondered if I'd ever use OD in 3rd gear, but I do find when
driving along a 4 lane blvd with the speed about 45 mph,
3rd gear with OD is pretty nice. So while cruising along like that when I
accelerate fairly aggressively, like an automatic
transmission, without me touching the switch, it will drop out of OD by itself
as I accelerate, and when the load is reduced as I
let up on the gas, it will shift back into OD.
I told the mechanic who rebuilt the transmission about this and he said that
isn't right, and his first question was if the oil
level OK so I checked. I took out the side fill plug and can see the oil level
and it just starts to ooze over the threads. So
that's not the problem.
What is normal shifting for an OD transmission?
Thanks,
Rye
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<DIV dir=3Dltr align=3Dleft><SPAN class=3D432084916-06102015><FONT =
color=3D#0000ff=20
size=3D2 face=3DArial>Definitely not normal. The OD should shift =
positively at=20
any engine power and gear (except 1st & reverse of course); and not =
drop out=20
unless you flip the switch, turn off the key, or shift out of=20
gear.</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D432084916-06102015><FONT =
color=3D#0000ff=20
size=3D2 face=3DArial></FONT></SPAN> </DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D432084916-06102015><FONT =
color=3D#0000ff=20
size=3D2 face=3DArial>From your description, I'd guess the OD hydraulic =
pressure is=20
drastically low. Buy or build a pressure gauge (there is a special =
adapter=20
required) and check the reading. Unfortunately, you'll need =
to pull=20
the tunnel, but the good news is that the OD doesn't have to come out of =
the car=20
to check the pressure.</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D432084916-06102015><FONT =
color=3D#0000ff=20
size=3D2 face=3DArial></FONT></SPAN> </DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D432084916-06102015><FONT =
color=3D#0000ff=20
size=3D2 face=3DArial>BTW, if I am right, then the OD clutch is slipping =
when it=20
appears to drop out of gear, and may even be slipping a little when you =
don't=20
notice. It's probably best not to use the OD until you can correct =
the=20
problem.</FONT></SPAN></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>-- Randall </FONT></DIV>
<DIV> </DIV><BR>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #0000ff 2px solid; PADDING-LEFT: 5px; MARGIN-LEFT: =
5px; MARGIN-RIGHT: 0px"=20
dir=3Dltr>
<DIV dir=3Dltr lang=3Den-us class=3DOutlookMessageHeader align=3Dleft>
<HR tabIndex=3D-1>
<FONT size=3D2 face=3DTahoma><B>From:</B> Triumphs=20
[mailto:triumphs-bounces@autox.team.net] <B>On Behalf Of </B>Rye=20
Livingston<BR><B>Sent:</B> Tuesday, October 06, 2015 8:54 =
AM<BR><B>To:</B>=20
fot@autox.team.net<BR><B>Cc:</B> =
triumphs@autox.team.net<BR><B>Subject:</B>=20
[TR] OD transmission<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV>Looking for comments and suggestions. </DIV>
<DIV><BR></DIV>
<DIV>I just installed a TR4 rebuilt overdrive transmission in my 1960 =
TR3.=20
Everything is running well and the OD is pretty cool. I =
don't know=20
what to expect or how it should work, but this doesn't seem right to =
me.=20
When I'm up to 60 mph or so and flip the switch, it shifts into =
OD no=20
problem. If I'm accelerating at the time, it won't shift until I =
let up=20
on the gas so there isn't any load. As I experimented with this, =
driving=20
down HWY 1 along the Pacific Coast Highway, there are short rolling =
hills and=20
as I am going up the hill and flip the switch, it won't shift into OD =
until=20
again I've crested the hill and have let up on the gas a bit.</DIV>
<DIV><BR></DIV>
<DIV>Now 3rd gear, I wondered if I'd ever use OD in 3rd gear, but I do =
find=20
when driving along a 4 lane blvd with the speed about 45 mph, 3rd gear =
with OD=20
is pretty nice. So while cruising along like that when I =
accelerate=20
fairly aggressively, like an automatic transmission, without me =
touching the=20
switch, it will drop out of OD by itself as I accelerate, and when the =
load is=20
reduced as I let up on the gas, it will shift back into OD.</DIV>
<DIV><BR></DIV>
<DIV>I told the mechanic who rebuilt the transmission about this and =
he said=20
that isn't right, and his first question was if the oil level OK so I =
checked.=20
I took out the side fill plug and can see the oil level and it =
just=20
starts to ooze over the threads. So that's not the problem.</DIV>
<DIV><BR></DIV>
<DIV>What is normal shifting for an OD transmission?</DIV>
<DIV><BR></DIV>
<DIV>Thanks,</DIV>
<DIV><BR></DIV>
<DIV>Rye</DIV></BLOCKQUOTE></BODY></HTML>
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