4L80e drops out of drive to D3

[MidLifer]

I am using a stock auto column from 67-72 with the Lokar rod shift linkage on my 6.0/4L80e. Whenever I get on the gas, the engine torques enough in the mounts drop the trans out of drive into d3 and I have to shift it back to drive after I let up on the gas. Advice on how I can fix this? Anyone else dealt with this?

[Clyde65]

Change to Locar cable??

[MidLifer]

Originally Posted by Clyde65

Change to Locar cable??

I guess that’s one option. Was hoping not to have to spend $150 though.
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[ls1nova71]

Good grief, what kind d of motor mounts are you using???? Sounds like what happens when one is broken. You could always use a cable to tie the engine down I guess...

[truckdude239]

i was going to say sound like u have a broken mount , on my 71 i have the stock linkage and and motor mounting and mine doesnt flex at all

[MidLifer]

Engine mounts are fine, they are CPP. The trans is mounted to a CPP crossmember. All bolts are properly torqued.

Motor may not be torquing much at all, in neutral it doesn't move a millimeter. The shifter moves very easily (had the pan open recently to change the internal harness and no, the internal detent mechanism isn't broken or bent either) and since I"m using a stock column, the detents on the column don't quite match up (when in Drive, the gear indicator shows between N and D) and the stock shift lever is heavy. If I support the shift lever while accelerating this doesn't happen. Could just be the weight of the shifter and some slight movement (remember, motor mounts and trans mounts have some rubber in them) that is enough to move the shifter.

So please, save the grief for someone who died. I'll call Lokar and ask them what they recommend.

[72MARIO]

My suburban will pop out of reverse when backing up tye camper trailer. I am thinking a cable or stock type shifter is the answer.

[MidLifer]

Originally Posted by 72MARIO

My suburban will pop out of reverse when backing up tye camper trailer. I am thinking a cable or stock type shifter is the answer.

That’s another behavior it exhibits sometimes.

I’ll report back on what lokar says. Might just have to switch to cable.

[Hart_Rod]

Sounds like it just needs some adjustment...

[MidLifer]

Originally Posted by Hart_Rod

Sounds like it just needs some adjustment...

That is exactly what the tech at Lokar said. Put both the trans and shifter into fully-detented Drive, then adjust the rod so that the bolts are 90 degrees. Gonna give that a try.
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[MidLifer]

Originally Posted by MidLifer

That is exactly what the tech at Lokar said. Put both the trans and shifter into fully-detented Drive, then adjust the rod so that the bolts are 90 degrees. Gonna give that a try.
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Just to report back and close this thread out - I followed Lokar's recommendations and adjusted the rod with both the trans and the shifter in D. Problem disappeared. Truck stays in Drive no matter how hard I get on it.