A-500 transmission OD and LU controls.

BigBlockMopar said
OD at 55? Why so late...?
What gears do you have in the rearaxle?
With my 3.55 gears and easy driving I usually switch on OD at around 30mph already.

I believe the PATC OD-kit switches on at 40-45mph, which seems more inline with the factory setting I believe?

BigBlockMopar said
Not quite knowing how the factory did it, I tend to disagree 'bout that.

I had my switch wired wrongly at the beginning and it would engage LU in 3rd, then upshift to OD, but the resulting jolt in the driveline told me this can't be right and imo the LU should be disengaged before the shift to OD.

I have 2:73 rear gears.
If I let it shift sooner it would almost be at an idle.:D
Most of my shifts are at about 2,100rpms driving normally, and of course higher if I step in it more.

Yea, having lockup come on before OD I could see that being a problem.:D
3rd gear fluid is what supplies the OD, so it's not possible for OD to engage unless the trans is already in 3rd, but lockup can come on whenever it is supplied with a ground. (any gear at any speed)

I played with that for awhile just for fun and at one point ended up idling down the street on cam lope at 35mph in 3rd with lockup.