"Mike Sykes" <mikesykes@cox.net> wrote:
:>>Of course on the 46RH, you
: could just use a toggle switch for the OD control but why bother when
: automatic PCMs should be plentiful.<<<
: 46rh, 44rh, A518, and A500's all rely on iput fomr the speed sensor to
: determine when to shift into OD. I don't know if a toggle would work... but
: then again, I don't know how the computer reads the speed sensor...
The A518 is a somewhat popular swap for the muscle car crowd; my
understanding is that you just need to rig up a manual switch to control
the OD. I don't know about the newer trannies (46re and 44re), but with
the aformentioned, hydraulically controlled transmissions it is the PCM
itself which tells the tranny when to go into and out of overdrive.
There isn't a separate tranny computer or anything, the PCM already has
the vehicle speed signal of course, and all it does is to apply power
or ground (I don't remember which) to the OD relay/circuit when the
appropriate conditions are met. By wiring a manual switch to the OD
relay/circuit you are basically replacing the electronic computer with
a meat computer that determines when the conditions are appropriate
for OD. :-)
--
-Jon-
.-- Jon Steiger ---- jon@dakota-truck.net or jon@jonsteiger.com --.
| 1970 Barracuda - 1990 Dakota 'vert - 1992 Ram 4x4 - 1996 Dakota |
| 1996 Intruder 1400 - 1996 Kolb FireFly - 2001 Ram QC 3500 CTD |
`------------------------------------ http://www.jonsteiger.com --'
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