transmittion not shifting into overdrive - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 10-18-2009, 10:27 PM   #11
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Hi all Today I replaced the T Stat 195 degree that worked good but I don't know if it helped the shifting as when I put the floor shift in first it still shifts up to third .when I am in od what is the engine rpm supposed to be approx. ours runs around 2500 at 60 miles ph. The car runs strong and fast.
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When you are driving 60 mph at 2500 rpm, move the shift lever down into 3rd gear. If the revs don't increase you weren't in OD, you were in 3rd. If the revs increase (500 rpm?) your OD was working.
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Old 10-20-2009, 12:07 AM   #12
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I was reading in the Haynes repair manuel that if the VSS is not working the TCC will not apply .How do I find out if the VSS is working. duncan

Last edited by duncan; 10-20-2009 at 12:09 AM. Reason: wrong manuel
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Old 10-20-2009, 08:06 AM   #13
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If your speedometer is working, the VSS is fine.
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Old 10-20-2009, 08:50 PM   #14
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Yes our speedometer works but the oddometer and tripmeeeter does not work. Any ideas on how to fix it. Thanks for the replys duncan
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Old 10-20-2009, 08:55 PM   #15
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Yes our speedometer works but the oddometer and tripmeeeter does not work. Any ideas on how to fix it. Thanks for the replys duncan
That is a speedo cluster issue.
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Old 10-22-2009, 10:29 PM   #16
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Hi All I went to Pick A Part today and found 2 , 92 and 93 or 94 ? Bonnevilles .One I'm sure had the square
coils and the other one had the Delco coils,( three round coils) is this correct. Did this year of tranny have the same trans. modualator. Or do I need to get one from a 87to 91 Bonney. I saw a post on the coils and it said one setup used one less wire will they still work in either year. Thanks duncan
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Old 10-22-2009, 10:49 PM   #17
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The modulator should work from any of them. If fluid comes out of where the vacuum line connects, it'* bad.
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Old 10-22-2009, 11:19 PM   #18
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Thanks for the reply Does the tranny modulator have anything to do with shifting into lockup.
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Old 10-23-2009, 09:06 AM   #19
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Thanks for the reply Does the tranny modulator have anything to do with shifting into lockup.
The short answer is that the modulator regulates line pressure for shift feel.
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Old 10-23-2009, 02:25 PM   #20
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Thanks for the reply I am getting a code34 MAF how do I fix that. The more I drive our car I think it is shifting into 4th but not into lockup will it hurt the tranny to drive it this way without going into lockup.
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3.8. l67, 3800, bonneville, bonnie, lockup, ponitiac, se, sle, sse, ssei, tcc, trans issues, transmission

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