small automatic shift issue on 76 vette

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BSAKing@hotmail.com - 18 Apr 2008 13:56 GMT

I notice that when I put the ole slug into gear that the position
between drive and neutral does not lock in. In other words, I can push
the shifter into neutral without pushing the shifter button. All the
others lock in.

Ideas on whether this is a biggy to fix or not?

TIA.

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Joe M - 19 Apr 2008 06:11 GMT

>I notice that when I put the ole slug into gear that the position
> between drive and neutral does not lock in. In other words, I can push
> the shifter into neutral without pushing the shifter button. All the
> others lock in.

You may push the lock button out of habit before moving the shift lever,
but...
I believe you will find that is correct function for most cars with auto
trans.
The lever will move between neutral and drive without pushing the lock
button.
The lever is held in either position by a spring detent.
IIRC, you don't need to press the lock button to move from 1 to 2, 2 to D, D
to N, N to D, R to N, or R to Park.

Joe, 72 coupe

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CardsFan - 21 Apr 2008 14:02 GMT

> >I notice that when I put the ole slug into gear that the position
>> between drive and neutral does not lock in. In other words, I can push
[quoted text clipped - 10 lines]
> IIRC, you don't need to press the lock button to move from 1 to 2, 2 to D,
> D to N, N to D, R to N, or R to Park.

No automatic I ever knew had a shift detent going from Drive to Neutral.
But there is a detent going from Reverse to Park.

AJM
'93 Ruby coupe, 6 sp (both tops)

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BSAKing@hotmail.com - 22 Apr 2008 13:53 GMT

> > >I notice that when I put the ole slug into gear that the position
> >> between drive and neutral does not lock in. In other words, I can push
[quoted text clipped - 16 lines]
> AJM
> '93 Ruby coupe, 6 sp (both tops)

Hmmm - so you mean you can be driving along the highway and just bump
it into neutral? Funny thing - I guess it is old age - I have had this
car for years and really do not remember if it was originally like
this.... duh... I was assuming something had given out on it.

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Tom In Missouri - 29 Apr 2008 17:07 GMT

Yes, I think all automatics you can bump from drive into neutral. I think
it is a safety feature so that you can always kick it out of gear if need
be. You can't bump reverse into park, though. That causes damage to the
transmission. Joe M was good until he got to the R to Park. lol That
causes lots of grinding and noise and if you do it at a fast enough speed
and enough force on the lever, you discover you no longer have park. Don't
try it at home, it is an expensive lesson. lol

Some very old Powerglides went PNDLR instead of what we consider normal with
PRNDL or PRNDLL today. I don't think there was a detent between R and L or
maybe not enough to prevent accidental changes. I believe the old '50s GM
Hydramatic transmission was also set as PNDLLR and maybe some Ford
automatics. The '50s had a lot of pushbutton automatics for Chrysler, so
I don't know if Chrysler had any sticks with PNDLR or not.

On Apr 21, 9:02 am, "CardsFan" <m...@here.com> wrote:

> "Joe M" <txj...@yahoo.com> wrote in message
>
[quoted text clipped - 21 lines]
> AJM
> '93 Ruby coupe, 6 sp (both tops)

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pj - 29 Apr 2008 20:30 GMT

Yeah verily, a lock to get into N could cause
'concern' in some tight full throttle
situations. (remembering back to those IAC
incidents in Audis... did those cars have a
lock-out on neutral?)

The Powerglide's PNDLR was a money saving 'mod'
to the standard (at the time) Hydramatic NDLR.
It saved some valve logic in the transmission.
The Hydramatic parking pawl was engaged by
pulling the selector into 'R' after the engine
was stopped.

Early Hydramatics had no locking detents. The
selector could be moved to any position,
anytime. The parking pawl would not engage
unless the pressure on both the front and rear
pumps was zero. 'Low' wouldn't engage above 40 mph.

--
pj

> Yes, I think all automatics you can bump from drive into neutral. I think
> it is a safety feature so that you can always kick it out of gear if need
[quoted text clipped - 40 lines]
> car for years and really do not remember if it was originally like
> this.... duh... I was assuming something had given out on it.

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BSAKing@hotmail.com - 29 Apr 2008 22:17 GMT

> Yeah verily, a lock to get into N could cause
> 'concern' in some tight full throttle
[quoted text clipped - 66 lines]
>
> - Show quoted text -

Thanks for the clarification. Ole Betsy requires a lot of work. Had it
since new and it has not been babied, so there is a looong list of
things to be done. Sounds like I can at least scratch this one off my
list. Thanks again for the input.

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ZÿRiX - 30 Apr 2008 02:09 GMT

The old auto's with a rear pump could also be pushed started at a high
enough speed...

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ZÿRiX
(¯`'..(<>..<>)..'´¯)

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