I think I have this but I would like to confirm. The auto trans is listed as a 4 spd with the OD being 4th. When I lock out the OD, it seems like I feel a 4th gear before OD would normally kick in. I am assuming that this is the TC locking up. Is this correct?<br><br>If so, does the TC lockup hold through the shift to OD or does it come out, shift to OD, and then lockup again?<br><br>

 

That &quot;4th gear shift&quot; you feel when locked out of OD IS the TC locking up. There is a little difference in the shift and the lockup, which yo u may notice after a while.<br>The stock TC does not have a strong enough lock-up to shift when locked. It will unlock, shift into OD, then lock up again.<br><br>Chris

 

Thanks for clarifying that.<br><br>My tranny has started 'hunting' ??? the TC lockup once I get into OD. This only happens between 45 - 50 mph at 1200 - 1500 rpm. If I am pulling hard, i.e. shift to OD above 50 and keep accelerating, I seem to blow through it without a hunt. If not and I am just running there, it seems to hunt. Any ideas?

 

Mine was doing the same thing when I did the relearn for the T.P.S {I call it} for another problem and the lock-up hunt at 45-50 under load went away also. So you might give a try, I think the procedure is posted somewere on this site. Hope this helps<br><br>Take Care,<br>FreightTrain Wayneo