Ken Thompson Posted January 8 Share Posted January 8 I recently replaced my ISC 350 with a newer, more powerful ISL 400 with the 2 stage jake. Since my Allison 3000 has never been programmed for a jake brake, it stays in 6th gear when I let off the throttle. I know most are programmed to shift to 4th, which is real abrupt. Some have them reprogrammed to only go to 5th. There is also a couple who like it to stay in 6th and they shift down manually. I know I don’t want it to shift to 4th, but can’t decide on 5th or leave it in 6th and do it manually. Are there any other parameters to set or change, like at what RPM it shifts down to the next gear? With everyone on here having traveled millions of miles, I know I can get the answer. Link to comment Share on other sites More sharing options...
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