Re: [AMC-List] 1971 Turbo Gremlin

["Jim Blair" <carnuck@xxxxxxxxxxx>]

A: The later TH400s and 4L80E were run with vehicle specific bells AFAICT. 
That is definitely true of the Jags at any rate. (I tried to find a nailhead 
version 4L80E to put in my J4000 but only found unipattern TH400s, and later 
Jag patterned trans)


From: adh@xxxxxxxxxxxxxxxxx (Sandwich Maker)
Subject: Re: [AMC-List] 1971 Turbo Gremlin
To: amc-list@xxxxxxxxxxxx
Message-ID: <200610060213.k962DfY27209@xxxxxxxxxxxxxxxxx>

" From: "Clarence Milstead" <cmilstead@xxxxxxxxxxxxxxxxx>
"
" I have a couple of questions that I need help/advice on. I see
people
" talking about a "nailhead" hydramatic transmission for earlier
model cars,
" will this transmission fit my 1971 bell housing and if it will
where is the
" best place to get one? I'd like one with OD if possible. Since
I installed
" the 3.55 gears I'm getting some spring wrap-up on a fast
start. Will just
" adding another leaf to the springs solve the problem? Thanks.

this tranny is a th400 first used with the early-'60s buick
'nailhead'
[hence the name] v8s.  they had a very deep flywheel recess, so
the
converter housing on the tranny case was comparatively shallow.
thus
it is possible to make adapter rings to mount the nailhead case
to
different bolt patterns, and this is what jeep, jaguar, rolls
royce,
ferrari, and apparently landrover did.

jeep used them from '65 to about '73 or so, when they switched
to a
custom amc-pattern case.  they had adapter rings for the kaiser
'tornado' ohc 230, the '64-'71 232, the nash 327, the buick 350
[yes -
i've seen one], and the late amc v8/6 pattern.

no, it won't bolt to your bellhousing.  with the right adapter
ring it
will bolt to your block.  advance adapters also has a plate that
puts
a standard gm th400 onto an amc v8 block.

no, it doesn't have an o/d - though there are aftermkt o/d for
the
th400.

ferrari and rolls have used the th400-based 4L80 4sp, but i
don't know
if it has a 'nailhead' front or not.  landrover used until
recently a
nailhead-case something-or-other, but whether it's still the old
th400
or a more recent 4sp remains to be discovered.
--
the original hydramatic is a comparatively primitive 4sp auto
from the
'40s, maybe '30s.  [for instance, it has a 'fluid coupling'
instead of
a proper torque converter]  almost everyone used them, but
production
ended when the factory burned down about '53 iirc.
________________________________________________________________________
Andrew Hay                                  the genius nature
internet rambler                            is to see what all
have seen
adh@xxxxxxxxxxxxxxxxx                       and think what none
thought

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