What happens when...
What happens when... Before going WOT from a roll, you drop it into 3 to get the car out of overdrive. This makes the car do a 3-2 shift which is much better than a 4-2 shift. This also brings the overrun clutches on. This much we know.
My question is, what happens when you put it back into OD right after it kicks down? Do the overrun clutches stay on or do they let go? I would think it would be best that they not be on when it shifts into 3rd gear.
My question is, what happens when you put it back into OD right after it kicks down? Do the overrun clutches stay on or do they let go? I would think it would be best that they not be on when it shifts into 3rd gear.
Joined: Nov 2003
Posts: 6,216
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From: Wichita KS / Rancho San Diego
Disagree that it is "known" that a 3-2 downshift is better than a 4-2 ... not to get that going again 
... but yes, the overrun clutches are not applied once you're in OD.
... but yes, the overrun clutches are not applied once you're in OD. 
Launching!
Joined: Sep 2005
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Originally Posted by BlackHawk T/A
Before going WOT from a roll, you drop it into 3 to get the car out of overdrive. This makes the car do a 3-2 shift which is much better than a 4-2 shift. This also brings the overrun clutches on. This much we know.
I really don't want to bring that up again...we've been through countless threads about it and I have read 2-3 different builders all say the same thing.
What I wanted to know was, after the overrun clutches come on and you are at WOT, when bumping it back into OD (while still accelerating) do they release before it shifts or do they stay on? I mean going to 3, WOT, then right back to OD on the shifter.
What I wanted to know was, after the overrun clutches come on and you are at WOT, when bumping it back into OD (while still accelerating) do they release before it shifts or do they stay on? I mean going to 3, WOT, then right back to OD on the shifter.
Any time the shifter is in OD the overrun clutches are off , but Im really not totally sure what your asking
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I see ok what you mean is if you pull it back so the overun clutch comes on in the 3-2 shift but then right back up before the 2-3 shift will the overun clutch go off and the answer is yes , but of note it is not on during 2nd in drive either
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Joined: Nov 2003
Posts: 6,216
Likes: 236
From: Wichita KS / Rancho San Diego
Right. The overrun clutches engage only in 3rd in D, but not at all in OD. Check the chart in post 28 of this thread: https://ls1tech.com/forums/showthrea...=472716&page=2
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Correct they come on during the 2-3 shift in D position even at WOT.do not come one at any throttle opening in the od position ,At some point I have considered doing and experiment, what if you blocked the overun clutch feed all together,That would I beleave eliminate the Preasure drop on the 2-3 manual shift, Which could be avantagious, The sacrafice would only be the loss of the overun braking effect in the D position.Any thoughts on that?
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Dont mean to hijack your thread blackhawk since performabuilt has been helping with this issue I have a question too for him about the D and 3 thing. When im cruising along at 60+ mph and nail it in D the car downshifts and pulls fine up top. If I leave the car in 3 at 60+ on the highway and nail it the car downshifts but acts like it doesnt know where its supposed to be at. The car kicks down then the RPM's jump up then come back down like the car feels like its bogging. If I roll into it easy it works fine. I did a little test the other day with the car in D and 3. From a stop it shifts through ALL the gears just fine. What could this be? I changed the fluid/filter when I got the car 3 months ago and its still fresh smelling not burnt still a red tint. I have some codes from removing all the air stuff since they are race headers. Could this cuase it to act up? If the trans was going south could you tell by the fluid? Either way I plan on buying one of your perfomabuilt trannys soon.
Hi well im not totally sure I understand what your asking , But if i am getting it right you mean when in the d3 position during kickdown at cruising speeds you get during the 3-2 shift a bog rev then go situation if this is true , This would be my guess , The the 3-4 clutch and the 2-4 band are overlapping a little , causing the slight drag feeling , Th reason this is compounded in the D3 position is the overun clutch is on causing a reverse accumulation affect, best way I can describe it , when the apply fluild is released on the 3-4 clucth and is at high preasure the overun clutch acts as and and additional preasure chamber slowing the 3-4 clutch release slightly and the band is coming on just before its completely released causing that sensation ,
At least that would be my theory but again Im not completely sure by the description I understand , but that would explain why it would happen in d and not od position
At least that would be my theory but again Im not completely sure by the description I understand , but that would explain why it would happen in d and not od position
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Originally Posted by performabuilt
Hi well im not totally sure I understand what your asking , But if i am getting it right you mean when in the d3 position during kickdown at cruising speeds you get during the 3-2 shift a bog rev then go situation if this is true , This would be my guess , The the 3-4 clutch and the 2-4 band are overlapping a little , causing the slight drag feeling , Th reason this is compounded in the D3 position is the overun clutch is on causing a reverse accumulation affect, best way I can describe it , when the apply fluild is released on the 3-4 clucth and is at high preasure the overun clutch acts as and and additional preasure chamber slowing the 3-4 clutch release slightly and the band is coming on just before its completely released causing that sensation ,
At least that would be my theory but again Im not completely sure by the description I understand , but that would explain why it would happen in d and not od position
At least that would be my theory but again Im not completely sure by the description I understand , but that would explain why it would happen in d and not od position
Im still not sure I understand the description im afraid .
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Mine does a similar thing and I think its just inherent to the 4L60E. If I drop it down to 3 first, it will feel like it downshifts twice. One small one, then the big one and it costs you some time. However with a WOT kickdown from "D" (overdrive on the Pontiacs) it will shift immediately and pull great.
What is the deal with the hesitation? This is the one major concern I have with doing this. Multiple transmission builders have all said the same thing, make it do 3-2 instead of 4-2 but I always run into this problem and it takes it forever to kick down. I would really like to get this fixed.
What is the deal with the hesitation? This is the one major concern I have with doing this. Multiple transmission builders have all said the same thing, make it do 3-2 instead of 4-2 but I always run into this problem and it takes it forever to kick down. I would really like to get this fixed.
When my car kicks down in D3 at that 60+ stomp like i was mentioning it actually feels like the trans is somewhat slipping. But when it kicks down and RPMS shoot up it doesnt stay there they come back down. Best way to describe it you nail it the car downshifts rpms go up but it doesnt want to go anywhere. Its almost like its not getting enough line pressure or somthing. Plus if it WAS slipping from a roll wouldnt it slip as well going through all the gears from a stop?
Joined: Nov 2003
Posts: 6,216
Likes: 236
From: Wichita KS / Rancho San Diego
Originally Posted by BlackHawk T/A
Mine does a similar thing and I think its just inherent to the 4L60E. If I drop it down to 3 first, it will feel like it downshifts twice. One small one, then the big one and it costs you some time. However with a WOT kickdown from "D" (overdrive on the Pontiacs) it will shift immediately and pull great. What is the deal with the hesitation?