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Old 12-27-2007, 11:17 PM
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Default 3-4 shift

just curious....at WOT I have no 3-4 shift and top out at about 100mph (bouncing off rev limiter). I had a friend look at my thunder racing tune and they intentionally turned it off. What would be the reason and should I leave it as is? I'm in Germany and its a bit annoying on the autobahn.
Old 12-27-2007, 11:22 PM
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The factory tune from GM will not allow a WOT shift to 4th gear, Look at whats being comanded and if it not you should be able to fix it by lowering the WOT mph and RPM for 4th gear
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Old 12-27-2007, 11:44 PM
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Default 3-4 shift

It was totally disabled by thunder racing when the pcm was sent in for a tune. I wasn't sure what the stock settings were. Should I leave it as is or turn it on? If its going to cause premature wear than I can deal with the no WOT shift.

Also while I got ya ......How much of a difference will a locking converter make as far as gas mileage is concerned? Ive heard several people say it makes a HUGE difference and others say its minimal. Keep in mind, the majority of my driving to and from work is autobahn cruising around 85-110 mph. THANKS AGAIN !!!
Old 12-28-2007, 10:14 AM
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Well If I was driving the autobahn I would definatly want WOT 4TH lol as for lockup at really high speeds it woul be minimal but still benificial from and cooling position which woul be the main advantage , Its does however make a huge different at lower speess in efficency .
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