Had the same thing happen. Turned out the overdrive lockout switch on the side
of the gearbox was going bad. Not sure if it had to do with a loose ?box and
the shifter moved a certain way while accelerating, or not, but and easy, cheap
replacement for sure. Pretty sure it would be electrical...good luck.
Sent from my iPhone 6+
> On Dec 16, 2017, at 11:49 AM, Bob Spidell <bspidell at comcast.net> wrote:
>
> I can't think of any failure mode in an OD that would only occur when
> accelerating. The pump and accumulator need to maintain a minimum pressure
> of 350psi or so, so you'd expect a weak pump or leaky accumulator to cause
> disengagement, or slow engagement, when slow or decelerating. Throttle
> switch, relay and solenoid would most likely fail randomly. I'd replace one
> at at time--starting with the switch--since it's the cheapest/easiest to
> replace--then go from there. I've had both a bad switch and relay cause
> random disengagement. If it's not the switch, the relay can be carefully
> opened-up and the points filed, to prove it's the problem or not before
> replacing.
>
> Bob
>
>
>> On 12/16/2017 10:17 AM, healeymanjim wrote:
>> this is a test. overdrive intermittently drops out when accelerating. no
>> specific conditions, just when accelerating. may
>> go days without doing this, then will do it every time i accelerate.
>> question. is it (a) solenoid (b) relay (c) throtlle switch
>> (d) adjustment (e) all of the above. TIA
>>
>
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