wont shift into 4th? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


2000-2005 Discuss your 2000-2005 Bonneville SE, SLE, and SSEi Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

Reply
 
 
 
Thread Tools Search this Thread
Old 01-23-2010, 12:07 AM   #1
Member
Posts like a V-Tak
Thread Starter
 
doodle4prez's Avatar
 
Join Date: Dec 2009
Location: Minerva Ohio
Posts: 66
Thanks: 0
Thanked 0 Times in 0 Posts
doodle4prez is on a distinguished road
Default wont shift into 4th?

I was driving just a little while ago and ive been noticing that it didnt really want to shift into 3rd from 4th like pulling a hill and now its doing it both in and out 4th.Could this be the accumulator or isnt there a sensor for every gear because its not pulling codes for that to be wrong.Theres been a recent service done on it and the fluid is full
doodle4prez is offline   Reply With Quote
Old 01-23-2010, 12:11 AM   #2
Retired Senior Admin

Expert Gearhead
 
Danthurs's Avatar
 
Join Date: May 2006
Location: Sheboygan Wisconsin
Posts: 29,661
Thanks: 0
Thanked 16 Times in 13 Posts
Danthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to all
Default

Sounds like your TCC solenoid switch is out of adjustment. This write up is for 96-99 but should give you a good idea of where to look and what to do. https://www.gmforum.com/electrical-133/tcc-solenoid-switch-284972/
Danthurs is offline   Reply With Quote
Old 01-23-2010, 08:16 AM   #3
Senior Member
Posts like a Northstar
 
Join Date: Oct 2009
Location: Boston Mass
Posts: 684
Thanks: 0
Thanked 0 Times in 0 Posts
sgp358 is on a distinguished road
Default

One common issue with the 4T65E is stripped splines on the 4th clutch hub. You could be intermittantly losing connection between the 4th hub and the overunning clutch. Are you sure it'* a 4th gear problem and not a TCC issue as Dan has pointed out?
sgp358 is offline   Reply With Quote
Old 01-23-2010, 05:02 PM   #4
Member
Posts like a V-Tak
Thread Starter
 
doodle4prez's Avatar
 
Join Date: Dec 2009
Location: Minerva Ohio
Posts: 66
Thanks: 0
Thanked 0 Times in 0 Posts
doodle4prez is on a distinguished road
Default

Im not sure of much with it i was gonna put a new filter change the fluid and do a shift kit to see if that fixed but i wanna make sure its not electronic before i do i think it is so through advice on hear im sure i'll find it
doodle4prez is offline   Reply With Quote
Old 01-23-2010, 05:05 PM   #5
Retired Administrator

True Car Nut
 
GunsOfNavarone's Avatar
 
Join Date: Apr 2009
Location: Williamsport, PA
Posts: 2,855
Thanked 167 Times in 129 Posts
GunsOfNavarone has much to be proud ofGunsOfNavarone has much to be proud ofGunsOfNavarone has much to be proud ofGunsOfNavarone has much to be proud ofGunsOfNavarone has much to be proud ofGunsOfNavarone has much to be proud ofGunsOfNavarone has much to be proud ofGunsOfNavarone has much to be proud ofGunsOfNavarone has much to be proud ofGunsOfNavarone has much to be proud of
Default

Keep in mind they have the latest generation ATF.

General Motors DEXRONŽ-VI Global Service-Fill Specification

During early 2005 General Motors released a newly developed automatic transmission fluid (ATF) for the factory fill of all GM Powertrain stepped gear automatic transmissions. The new fluid provides significantly improved performance in terms of friction durability, viscosity stability, aeration and foam control and oxidation resistance. In addition, the fluid has the potential to enable improved fuel economy and extended drain intervals. Since the performance of the new fluid far exceeded that of the DEXRONŽ-III service-fill fluids available at the time it became necessary to upgrade the DEXRONŽ service-fill specification in order to ensure that similar fluids were available in the market for service situations. This latest upgrade to the service- fill specification is designated DEXRONŽ-VI.
Since General Motors introduced the first ATF service-fill specification in 1949 it has been periodically necessary to upgrade the specification. This upgrading process ensures that available service fill fluids are of an appropriate quality for use in transmissions that have been designed around the factory fill fluid performance. It should be noted that, as with previous upgrades, DEXRONŽ-VI fluids are designed to be backward compatible with earlier transmission hardware. More importantly, earlier type fluids are not forward compatible with transmission hardware that was designed to use DEXRONŽ-VI fluid, i.e. DEXRONŽ-III is not compatible with the most recently designed transmissions, and the use of these earlier type fluids could result in transmission damage. All current calibrations and certification tests are now conducted with DEXRONŽ-VI ATF. DEXRONŽ-III fluids should not be used for these applications where the owners manual recommends the use of DEXRONŽ-VI. GM does not license or support obsolete ATF specifications or the use of fluids that are being marketed against cancelled specifications.
All DEXRONŽ-III licenses expire at the end of 2006 and will not be renewed. Beyond that date GM will only support the use of DEXRONŽ-VI fluids for use in Hydra-Matic transmissions. Fluids sold in the market after that date bearing claims such as “suitable for use in DEXRONŽ-III applications” or similar wording should be avoided. DEXRONŽ-VI licensed fluids are fully backward compatible and can be used in all applications covered by earlier GM ATF specifications.
GunsOfNavarone is offline   Reply With Quote
Old 01-23-2010, 07:18 PM   #6
Member
Posts like a V-Tak
Thread Starter
 
doodle4prez's Avatar
 
Join Date: Dec 2009
Location: Minerva Ohio
Posts: 66
Thanks: 0
Thanked 0 Times in 0 Posts
doodle4prez is on a distinguished road
Default

Thanks guns I will be sure to buy that when i do my filter and fluid change
doodle4prez is offline   Reply With Quote
Old 01-23-2010, 09:53 PM   #7
Senior Member
Posts like a Northstar
 
Join Date: Oct 2009
Location: Boston Mass
Posts: 684
Thanks: 0
Thanked 0 Times in 0 Posts
sgp358 is on a distinguished road
Default

I think that Dex VI is much more expensive than Dex III.
sgp358 is offline   Reply With Quote
Old 01-25-2010, 04:30 AM   #8
Senior Member
Posts like a Supercharger
 
Join Date: Jun 2006
Location: Moon of meepsorp
Posts: 183
Thanks: 0
Thanked 0 Times in 0 Posts
Roadrunner is on a distinguished road
Default

Quote:
Originally Posted by sgp358 View Post
One common issue with the 4T65E is stripped splines on the 4th clutch hub. You could be intermittantly losing connection between the 4th hub and the overunning clutch. Are you sure it'* a 4th gear problem and not a TCC issue as Dan has pointed out?
X2
This is a common problem that GM fixed in ’03 by using a shaft with hardened splines.
When my shaft went out, it would sometimes whine when trying to go into fourth.
Also when you lose 3/4 as opposed to TCC/no TCC there would be a more drastic change in rpm.

The trans shop confirmed my case by finding some fine metal shavings in the fluid.
They checked this somehow without removing the pan.
If I were to do it, I would put some magnets on the outside/bottom of pan, drive it for a while, then drop pan and look inside near the magnets for accumulation.
Roadrunner is offline   Reply With Quote
Old 01-25-2010, 07:28 AM   #9
DINOSAURUS BOOSTUS

Expert Gearhead
 
BillBoost37's Avatar
 
Join Date: Mar 2005
Location: Enfield, CT
Posts: 41,391
Thanks: 0
Thanked 0 Times in 0 Posts
BillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of light
Default

My first gut feeling was 4th hub shaft spline gears as well. However very valid points are being made.

Take it out for a drive with the selector in 3rd. After it is in 3rd and you are over 45-50ish, you should feel the TCC kick in and drop the rpm down by 300-500. After that happens, move the shifter to 4th and see the rpm'* drop further.

I'd expect the TCC to unlock, try the 4th shift and then relock. if your rpm don't go down more than 3rd with TCC lock, then most likely the 4th shaft is bad.

On the new Dex, it'* the current replacement for Dex III, however in our older transmissions there does not appear to be a great benefit from what I've heard. It'* about the equivalent of a synthetic fluid.
BillBoost37 is offline   Reply With Quote
Old 01-25-2010, 01:58 PM   #10
Member
Posts like a V-Tak
Thread Starter
 
doodle4prez's Avatar
 
Join Date: Dec 2009
Location: Minerva Ohio
Posts: 66
Thanks: 0
Thanked 0 Times in 0 Posts
doodle4prez is on a distinguished road
Default

I will try that for sure boost,i was reading in another post i cant find it right now tho that said if your driving in 4th and you push the brake lightly the rpms will jump up.I did that and it does jump up about 500 rpms does that mean the splines are bad or is that the tcc out of adj
doodle4prez is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
94 buick park ave. wont shift into o.d. zildjian Buick 17 06-08-2015 07:44 PM
Delayed shift into overdrive (4th gear) madsquirrel Chevrolet 1 08-16-2013 08:12 AM
99 bonneville wont go into 4th fixingmosbonnevill 1992-1999 3 06-14-2009 02:12 PM
93 se wont shift into gear immedatley blinkyvx 1992-1999 13 03-12-2007 09:17 AM
FYI if you lose 4th gear / no fourth gear / no 4th gear caminated2k 2000-2005 6 07-24-2005 11:26 PM


Tags
3-4, shift, splines, tcc, transmission

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 02:58 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.