Not shifting from 3-4 in OD - Ford Powerstroke Diesel Forum
 
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post #1 of 7 Old 11-16-2013, 11:28 AM Thread Starter
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Not shifting from 3-4 in OD

Hey guys I am a noob, with a question about my tranny. I have a 2002 F350 with 7.3, it has a banks 6 gun tuner, aftermarket exhaust, and a cold air intake. Recently I was hauling a 4,000 lb load of gravel and had the tuner all the way down and the OD off. Once I hit 3rd gear it would not shift into 4th. I was running 3,000 rpms at 55MPH. No CEL and No OD light blinking. I tried doing it with a empty load, tuner turned up etc and same issue. tranny is fine with OD on. Only doing it when OD is off. Any ideas? Thanks in advance!
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post #2 of 7 Old 11-18-2013, 06:50 AM
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Overdrive is 4th gear. With OD locked out, 3rd is as high as the tranny will go.

2001 F350 CCSB ZF6
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post #3 of 7 Old 11-18-2013, 08:42 AM Thread Starter
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Really? So is it possible when I don't have a heavy enough load, and the od is off that its normal for it to be running that high of rpms? I towed my 30 foot trailer which weighs about 7000 lbs fully loaded with od off a few months ago and didn't have this issue.
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post #4 of 7 Old 11-18-2013, 09:29 AM
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I don't know enough about trannies to say. 55 mph at 3000 rpms seems too slow to me. your TC may be slipping, not locking up. I had an '02 that I bought new and I replaced the trans 2 times. 1st one was at 13k under warranty and the second one was my fault, never select "2" with the gear shifter, it locks the tranny in 2nd, ooooops! I never was happy towing heavy with the auto which is why my last 2 trucks have been manuals. There are obviously many auto trucks out there working hard and doing a great job. Several have no issues and several do. I don't know what makes some work great and some fail. CODUM, I think is his handle, on this forum has or had over 400k on his truck and I think only 1 trans rebuild which if I remember correctly was at least after a 200k.

Wish I could help more, hopefully someone with better knowledge will chime in.

2001 F350 CCSB ZF6
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post #5 of 7 Old 11-19-2013, 11:00 AM Thread Starter
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Ya I thought 3000 RPM's was too high too. Im almost wondering if the truck was re-geard before I bought it. Like I said when OD is engaged tranny is perfectly fine. So that leads me to believe it isn't an issue with the tranny. Ill have to do some more digging.
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post #6 of 7 Old 11-28-2013, 05:03 AM
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What speed are you running at 2000 rpm in OD? I have 3.73 gears and it is running 70 mph at 2000 rpm in OD.


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post #7 of 7 Old 12-19-2013, 09:18 AM Thread Starter
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Sorry for the delay I rarely drive the truck so I was waiting till the next time I did to respond. Im at about 55 MPH at 2000 RPM. 2200 RPM at about 60 MPH and 2500-2700 RPM at about 70MPH. (In OD)
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