No OD after rebuild
Thread Starter
Teching In
Joined: Jan 2004
Posts: 17
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From: Fallbrook, CA.
No OD after rebuild Had my C5 trans rebuild by a good shop. Trans came back and I reinstalled.
During test drive I find that I don't have 4th and the car doesn't engine brake. The computer has not set any codes. Any thoughts?
Mike V
During test drive I find that I don't have 4th and the car doesn't engine brake. The computer has not set any codes. Any thoughts?
Mike V
first I would look at the data stream to see if the PCM is comanding the 4th shift. When you say no engine braking do you mean in the lower gears d&3 2 1 or in the OD 4th position
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Thread Starter
Teching In
Joined: Jan 2004
Posts: 17
Likes: 0
From: Fallbrook, CA.
Originally Posted by performabuilt
first I would look at the data stream to see if the PCM is comanding the 4th shift. When you say no engine braking do you mean in the lower gears d&3 2 1 or in the OD 4th position
Thanks for the help.
Mike V
Originally Posted by Jordan S.
I think he's talking about when he manually shifts it into a lower gear the gears dont pull the rpm's down ?
As for why wouldnt it comand the 4th shift thats hard to say but in any diagnosis of a no upshift or really any shifting issue the first thing is to look and see what the PCM is telling the trans to do.
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If your in the OD position in 3rd gear you would have very little engine braking probably not noticable. Nowin the D position you should feel engine braking when you let off
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On The Tree
Joined: Jun 2007
Posts: 165
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From: haltom city/DFW, Texas
At 50 to 60 mph you probably wont feel a brake effect . If you have an available scan tool you can watch data to see if it is comanding 4th gear at all . The band is on in 2cd and 4th but applied through a different circuit and a different part of the band servo . I would check the servo !!