Re: 435 / T 18
The problem with NP435's walking out of gear can be attributed to the input shaft provided by Advance when adapting it to Jeeps. They have finally admitted that machining tolerances weren't tight enough on many of their input shafts and is causing the problem. If you do have this problem they won't just take your word that their shaft is the problem though. They make you pull it out and send it to them for measurement. I haven't heard of anybody's claim being denied though.
'75 CJ5,258 w/Howell EFI,T18a,4.27's,33's,On-board air,Warn 8274