98 4L60E first gear chatter intermitent,stall speed feels higher
If the trans is cool it shifts fine , after a while of driving it feels like the tc is slipping at a higher speed . some times it loses od and drives in 3 with lock up , i put in neutral shut it off and restart it is fine for a while , the chatter used to go away in first when pulled down manually but now it does not matter , had the fluid flushed it felt better then the first gear would feel weak and the rpm woud hit over 2 k , feels like power loss but its not getting to the rear to drive the truck . its intermitent and some days its perfect likei would expect. i was told selinoids to start but dont know where to start . also some times the gear selector wont go out of park and i have to force it .... i believe i have a selinoid issue and a valve body issue , i have the transgo kit fir these complaints and some i dont have yet , there are no (zero) codes for the trasns , the light is OFF . i dont think its slippage as its not clunking banging or making noises...i duno . i have a spam dumpster to reply to i dont care about, and if theres a subject line about tranies i will look and hope it not about cross dressers..lol spamdmpstr at gmail dot com ..................... if your smart enought to tell me whats up i believe you can use the above address to let me know whats up or ask more questions about the issue thanks
Re: 98 4L60E first gear chatter intermitent,stall speed...
Ten k latter the slipping is worse and so is the chatter Its no longer intermittent. I have concluded that the band is slipping and thats one of the noises. time to pull it and go through it. you .cant tell me this is the only one out of some quarter million units produced over 98 and 99 with this model trans.. also trans parts usa has the converter for 120 and all there other parts are the best price i have found in months of looking and pricing and the shipping is fair ...
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First off there may be nothing wrong. At highway speed, the trans will shift down to 1st, but you won't feel it. If should feel like neutral. Does it shift normally when your "wide open throttle" from standstill? If it shifts properly in this situation, then your fine, don't worry. How about wide open throttle at say 25mph? how about 35 and 45? anything over that and its gonna feel like neutral. IF your convinced that your passing gear is not working right, it could mean that its out of adjustment, and needs a little more push, more throw, or kinda like adjusting the rod out a little bit further. Adjust your "passing gear linkage" or kickdown as you imply. Second guess would be low on transmisison fluid, filter, and last, the transmissoin control selonoid. Again I suggest its doing just fine, if it shifts down at any speed.
When you changed the ****** fluid was it brown? If so I regret to inform you, you may need a new transmission. The brown color is due to the clutches in the trans, wearing down over time. Does it shift hard when you drive it? If it does that is another sign the trans has gone out the window.
can you roll trk? does it stall in any gear as soon as you shift? (rev/fwd) possible torque converter malfunction or trans shaft broke (internal failure) which has trans locked up. It is cheaper to get used trans than having that one rebuilt. Most trans shops offer free inspection but give all the same diagnosis it seems. We have to rebuild trans!! I have yet after 28 yrs have a trans shop say they will tear down and fix only that problem (unless it was the torque converter). If trk does not roll, remove rear drive shaft ( 2 wheel drive ) does it roll now? Is the fluid clean and smells clean? does fluid look dark and smells like burnt toast? I would just get a used trans with clean fluid present and swap, make sure it comes with the torque converter or buy new one. Sorry this has happened to you at the coldest time of the year, good luck
It will shift out of overdrive upon increasing throttle , pulling hills and so on. Your overdrive probably kicks in around 35 to 45mph and kicks back out as you increase throttle. Electrically controled speed sensor to control the response. Overwise the engine would bog down to a stall. Over drive is just that. It changes the gearing ratio to over drive meaning less then final gear 4 to 1 down to 4 to 3 etc more direct drive ratio to lessen consumtion of fuel with less stress on engine. Have shift speed sensor adjusted. Don't drive in overdrive in city if most driving is under 45mph
If the engine revs up more than normal and your not gaining speed then the clutch is slipping.If you shift down to pass and then try to accelerate and the engine revs up but you don't gain speed,the clutch is slipping.If with the park brake on you can let the clutch out without stalling you need a clutch.If it makes a tinny sound when the clutch is pushed,you need a trow-out bearing
With normal acceleration the 1st to second shift point should be around 2500-3000 rpm. Most of your shifts under moderate acceleration will take place at this same point or when there a light load on the transmission. Under hard acceleration the RPMs will climp higher due to increased power needs and the computer will shift when less power is needed or the RPMs climb to an unsafe speed say5000-6000rpms (depending on where yours redlines). Also going up a steep hill will raise the RPMs higher and goind down a hill will cause a faster shift at lower RPMs. These can always be altered by an individual owner by adjusting shift points, using performance parts and if you have problems (low tranny fluid/trans issues). Your trans RPMS are fine and will vary depening on how your foot accelerates. The shift pattern should be the same every time you drive slow/medium/fast/, look for changes in those patterns you will also catch a problem early.