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Pontiac Bonneville Transmisssion

45 messages,  Last post on Dec 07, 2009 at 1:59 PM

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What is this discussion about? Pontiac Bonneville, Transmission, Sedan

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#19 of 45 Re: Pontiac Bonneville [imidazol97] by imidazol97 Feb 19, 2008 (4:22 pm)
Replying to: imidazol97 (Feb 19, 2008 3:31 pm) Is your transmission fluid low? That was mentioned in the service manual for the 4T65E transmission. I believe you have the 4T60E. I'll check that manual later when I find it.   Another factor might be the temperature of the fluid is going high and the transmission downshifts out of overdrive.   Are the other three speeds all working completely normally? Can you feel the transmission go into 4th and then the lockup torque converter latch in which reduces engine rpms more?--when the trans operates normally. Replies to this message: friend3 (Feb 20, 2008 12:30 pm)
#20 of 45 Re: Pontiac Bonneville [imidazol97] by friend3 Feb 20, 2008 (12:30 pm)
Replying to: imidazol97 (Feb 19, 2008 4:22 pm) The problem started a few years back while pulling a small trailer, and only happened while pulling the trailer. But of course has worsened to where it happens without the trailer.The rad. was removed and boiled out, and the fins cleaned. The Therm. has been replaced a couple of times. It shifts fine, and predictable. As far as I can determine this trans is not electronically controlled. However, it apparently has two sol. valves, one for the 1-2 shift, and one for the 3-4 shift. Plus another for the lockup. On the older and smaller 125 series trans, the lockup sol. gave trouble holding the converter in a locked position, and not locking up at all, and needed to be replaced. Could this be the problem here? I can't tell if the trans. is running too warm. If it is, it is not bringing up the coolant temp. The coolant temp runs a consistent 190-195.
#21 of 45 Transmission by imidazol97 Feb 20, 2008 (1:29 pm)
The small trailer probably should have been towed in 3 where the higher ratio would have allowed an easier tow and the fluid would have stayed cooler.   Or an external cooler can be put in the trans fluid line after the fluid goes though the radiator and keeps the fluid cooler.   The neighbor had towed a boat with his Blazer in 4th gear without a cooler once a year to the Lakes area in Southern Kentucky--mostly interstate, and hurt his transmission with overheating.   I believe you have a 4T60E which means electronic controls. But diagnosis is needed. Has it had a filter change in the last 30-40 K miles? I hope it's something simple like a solenoid for the torque convert lockup. Replies to this message: friend3 (Feb 21, 2008 9:37 pm)
#22 of 45 Re: Transmission [imidazol97] by victor53 Feb 21, 2008 (1:12 am)
Replying to: imidazol97 (Feb 18, 2008 7:30 am) Yes, the firewall does seem to jump. I will try using 1st. gear this morning to see if it makes a difference and I have been trying to baby the acceleration. Thanks Replies to this message: victor53 (Mar 18, 2008 8:25 am)
#23 of 45 Re: Transmission [imidazol97] by friend3 Feb 21, 2008 (9:37 pm)
Replying to: imidazol97 (Feb 20, 2008 1:29 pm) Yes, you are right on using the lower gear to pull a trailer of any size! I'll have to check the records for the oil and filter change. It is a 4T60E, but is there a separate module that manages the transmission, of is it managed through the ECM? You mentioned diagnosis, is it possible to pull a code tor this kind of problem? Thank you for the help.
#24 of 45 transmission issue? by kaylee01 Feb 23, 2008 (5:08 pm)
My 95 Bonneville goes into overdrive once then when you pass someone it kicks out. The car has to be turned off and restarted for it to go back into overdrive. The other gears are fine. It has been in the shop 3 times for this problem and it still is not fixed. Replies to this message: rhtrans (Feb 29, 2008 6:31 pm) kaylee01 (Mar 03, 2008 6:43 am) foru2nv (Nov 13, 2008 8:21 am)
#25 of 45 Re: transmission issue? [kaylee01] by rhtrans Feb 29, 2008 (6:31 pm)
Replying to: kaylee01 (Feb 23, 2008 5:08 pm) Take it to a different shop! Replies to this message: kaylee01 (Mar 03, 2008 6:43 am)
#26 of 45 Re: transmission issue? [rhtrans] by kaylee01 Mar 03, 2008 (6:43 am)
Replying to: rhtrans (Feb 29, 2008 6:31 pm) The 95 Bonneville has been to several shops noone can find the problem with the overdrive. The cylinoid has been changed and so has the transmission wiring harness and it still only goes into overdrive once. When you speed up it kicks out and won't go back into overdrive until the car is turned off. So I was hoping to see if anyone else had experienced this problem and what the outcome was.
#27 of 45 Re: Transmission [victor53] by victor53 Mar 18, 2008 (8:25 am)
Replying to: victor53 (Feb 21, 2008 1:12 am) Yes, when I manually place the transmission into first gear the transmission feels solid, smooth and accelerates without hesitation.
#28 of 45 transmission by kinslayer76 Mar 23, 2008 (6:19 am)
i own a 95 bonneville sse it is now mar 08 i have 400k on this car i have done a lot of matience and repairs over time but now im having a problem with my transmission. the car runs great no major problems as i fix stuff before it goes. my transmission died 2 yrs ago so i bought a used one at a junk yard, i had a friend install it for me he knows cars preety good and has always done good by me. when he put the trany in he told me he had problems with the linkage cable??? now my car has a hard time shifting out of 2 gear i have to almost redline it to get her into 3 and even 4th. i was wondering if anyone knows if the linkage cable could cause this or is it another problem. i do most of my own work on my cars but i have never messed around with a tranny be4 looking for some insight thank you for your time guys. Replies to this message: imidazol97 (Mar 23, 2008 3:05 pm)

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