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Hi Mike,
I recently experienced exactly the same problem with newly rebuilt a BT7
side shift gearbox and overdrive unit when turning it backwards before
adding oil.
Like you I suspected the Sprague clutch but after considerable
investigation the cause turned out to be the new 2nd gear syncro ring
which, when the box was turned backwards, was winding itself tightly onto
the cone of 2nd gear.
This is something I've never experienced before but concluded that it was
unlikely to present a problem after the box has be run with new oil.
This may not be the cause in your case but certainly it is something worth
considering.
M
On Mon, Aug 19, 2019, 10:54 PM Mike Tobin, <ahbt71@gmail.com> wrote:
> Hello Again,
>
> Finally got oil pressure in the rebuilt OD. With the car in 4th it shows
> about 500 psi on a gauge.
> However, I noticed when reattaching the drive shaft that with the trans in
> neutral the output won't rotate in the reverse direction. It rotates
> easily by hand in the forward direction. This is true before and after the
> pressure has been released. Before getting pressure in the OD it rotated
> by hand in both directions. I haven't tried to engage the OD. It's a
> hard mechanical stop. I'm afraid the one-directional clutch be engaged and
> I don't want to break anything.
>
> I've been a long time gone from this fine place. Life's taken a lot of
> twists and turns, but it's good to be getting back to having to come here
> for help.
>
> Thanks and Cheers
> Mike Tobin
> Townsend, Montana
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<div dir=3D"auto">Hi Mike,<div dir=3D"auto">I recently experienced exactly =
the same=C2=A0problem with newly rebuilt a BT7 side shift gearbox and overd=
rive unit when turning it backwards before adding oil.</div><div dir=3D"aut=
o">Like you I suspected the Sprague clutch but after considerable investiga=
tion the cause turned out to be the new 2nd gear syncro ring which, when th=
e box was turned backwards, was winding itself tightly onto the cone of 2nd=
gear.=C2=A0</div><div dir=3D"auto">This is something I've never experi=
enced=C2=A0before but concluded that it was unlikely to present a problem a=
fter the box has be run with new oil.</div><div dir=3D"auto">This may not b=
e the cause in your case but certainly it is something worth considering.=
=C2=A0</div><div dir=3D"auto">M</div></div><br><div class=3D"gmail_quote"><=
div dir=3D"ltr" class=3D"gmail_attr">On Mon, Aug 19, 2019, 10:54 PM Mike To=
bin, <<a href=3D"mailto:ahbt71@gmail.com"; target=3D"_blank" rel=3D"noref=
errer">ahbt71@gmail.com</a>> wrote:<br></div><blockquote class=3D"gmail_=
quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1=
ex"><div dir=3D"ltr"><table cellpadding=3D"0" class=3D"m_460544490335359292=
8m_3118405970152023969gmail-ajC" style=3D"border-spacing:0px;line-height:20=
px;font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:14px=
"><tbody><tr class=3D"m_4605444903353592928m_3118405970152023969gmail-ajv">=
<td colspan=3D"2" class=3D"m_4605444903353592928m_3118405970152023969gmail-=
gL" style=3D"vertical-align:top;width:auto;padding:2px 0px"><span style=3D"=
font-family:Arial,Helvetica,sans-serif;font-size:small">Hello Again,</span>=
<div style=3D"font-family:Arial,Helvetica,sans-serif;font-size:small"><br><=
/div><div style=3D"font-family:Arial,Helvetica,sans-serif;font-size:small">=
Finally got oil pressure in the rebuilt OD.=C2=A0 With the car in 4th it sh=
ows about 500 psi on a gauge.<div>However, I noticed when reattaching the d=
rive shaft that with the trans in neutral the output won't rotate in th=
e reverse direction.=C2=A0 It rotates easily by hand in the forward directi=
on.=C2=A0 This is true before and after the pressure has been released.=C2=
=A0 Before getting pressure in the OD it rotated by hand in both directions=
.=C2=A0 I haven't tried to engage the OD.=C2=A0 =C2=A0It's a hard m=
echanical stop.=C2=A0 I'm afraid the one-directional clutch be engaged =
and I don't want to break anything.</div><div><br></div><div>I've b=
een a long time gone from this fine place.=C2=A0 Life's taken a lot of =
twists and turns, but it's good to be getting back to having to come he=
re for help.</div><div><br></div><div>Thanks and Cheers</div><div>Mike Tobi=
n</div><div>Townsend, Montana</div></div></td></tr></tbody></table></div>
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