Overdrive at 32mph? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 10-09-2004, 10:04 PM   #1
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Default Overdrive at 32mph?

Do 4T65- E-HD transaxles shift into OD at 32mph? Mine does and I don't think its right, and then the TC locks up at 40mph. Obviously this is under gentle acceleration. It will slip on occation and only under gentle acceleration into OD and TC lockup. Any ideas?
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Old 10-09-2004, 10:11 PM   #2
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Scantool. You need to make sure that'* not 3rd gear you're feeling. You can watch the shifts and TC solonoid with a scantool realtime.
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Old 10-10-2004, 11:11 PM   #3
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I watch the rpms and its definitly OD and TCC lockup. I know its strange. The shift points under very light acceleration are 1st-2nd @12mph, 2nd-3rd @20mph, 3rd-OD @32mph, and TCC lockup @41mph. In the 93' OD doesn't hit until 40mph and the TCC engages at a minimum of 46mph.
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Old 10-10-2004, 11:13 PM   #4
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One more question. Would the scantool hook up and everything be the same as the 93'?
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