4l60e 5500 rpm slip
01-02-2007, 03:33 PM
#1
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4l60e 5500 rpm slip Guys I am relatively new to the forum I have been a part of the corvette forum for quite some time, but I recently noticed you have far greater support for tech talk on ls1’s and auto transmissions. MY tranny on my 98 c5 was redone by ammco 30,000 miles ago and recently after a torque converter change and several test drives my shift from 2nd to third slips from 5500 rpms to 6000 once the gear goes in it does not slip it pulls very well. It also slips if you downshift it from 3rd to 2nd or from 4th to 3rd. I havn’t checked if the shift from 3rd to 4th slips because you got to get it up near top speed for that. I am currently running a 2.73:1 rear end
01-02-2007, 07:24 PM
#2
So you're saying that it upshifts at 5500 and then slips to 6000 and stays there?
Fluid is good?
Does it slip on lock-up at highway speeds if you step into the throttle?
How big is your stall?
Engine mods?
Years ago I remember that stalls over about 3000 on vettes had some issues that were cured by programming, but this sounds like way more slippage than programming would account for.
Fluid is good?
Does it slip on lock-up at highway speeds if you step into the throttle?
How big is your stall?
Engine mods?
Years ago I remember that stalls over about 3000 on vettes had some issues that were cured by programming, but this sounds like way more slippage than programming would account for.
01-02-2007, 08:14 PM
#3
Since some of the questions ragtop ask would certainly be helpful , This is just a good guess , but I'm betting on excessive 3-4 clutch clearance ,
heres why ,
when the up shift is commanded fluid travels to the 3-4 clutch and the same fluid releases the 2-4 band now if th 2-4 band releases before the 3-4 clutch can be applied there will be a almost neutral feeling during the shift rev bump or rev slide,
same deal on the 3-2 shift if the 3-4 clutch pack is near max travel and releases early before the band comes on then you again will get a slipping like rev bump or rev slide condition ,
3-4 clutch clearance can be and issue even on new builds because we have noted and since we learned the characteristics of the clutch packs we use that the clearance set at time of the build will not be the clearance you get at 1000 miles or even after a few compressions , So if the previous builder for instance used the near max tolerance for the setting then it could now easily be excessive , Additionally if a much stiffer than stock return spring in used in the 2nd servo its can cause a similar issue though usually not as bad as described here.And though not as common to much band clearance can cause a similar slip rev bump .
heres why ,
when the up shift is commanded fluid travels to the 3-4 clutch and the same fluid releases the 2-4 band now if th 2-4 band releases before the 3-4 clutch can be applied there will be a almost neutral feeling during the shift rev bump or rev slide,
same deal on the 3-2 shift if the 3-4 clutch pack is near max travel and releases early before the band comes on then you again will get a slipping like rev bump or rev slide condition ,
3-4 clutch clearance can be and issue even on new builds because we have noted and since we learned the characteristics of the clutch packs we use that the clearance set at time of the build will not be the clearance you get at 1000 miles or even after a few compressions , So if the previous builder for instance used the near max tolerance for the setting then it could now easily be excessive , Additionally if a much stiffer than stock return spring in used in the 2nd servo its can cause a similar issue though usually not as bad as described here.And though not as common to much band clearance can cause a similar slip rev bump .
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01-02-2007, 10:54 PM
#4
Before you do anything have the fluid level rechecked again like mentioned above since you just had the converter changed. These cars are very sensitive to even a slightly under filled transmission. I've helped guys like you more than once with C5's after converter changes. Try that first and see what happens, it's worth checking first before condemning the trans.
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01-03-2007, 08:22 AM
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I am running a vararam intake, s.s. long tube headers, pioneer underdrive pully, straight pipes, no cats, o2 simulators… well that’s it. Stall is a 1500 rpm very low I have it like that due to all the stop and go driving. Fluid levels are good checked a bunch of times I am very paranoid about that. The only way I feel a slip on the lock up its if I downshift it manually or automatically into 2nd the downshift will slip, that has been established, but once second gear is in and I slam on the gas with the rpms under 3000 yes it slips to about 4500 then catches and goes back down. It will do both upshifts and downshifts from 2nd to 3rd but with excessive slippage causing the rev limiter to hit about 3 to 4 times. I am going to check the 1-2 pistion and the 3-4 piston / bore when I drop the valve body….by the way no codes
Thanks for the help guys
Thanks for the help guys
Originally Posted by Ragtop 99
So you're saying that it upshifts at 5500 and then slips to 6000 and stays there?
Fluid is good?
Does it slip on lock-up at highway speeds if you step into the throttle?
How big is your stall?
Engine mods?
Years ago I remember that stalls over about 3000 on vettes had some issues that were cured by programming, but this sounds like way more slippage than programming would account for.
Fluid is good?
Does it slip on lock-up at highway speeds if you step into the throttle?
How big is your stall?
Engine mods?
Years ago I remember that stalls over about 3000 on vettes had some issues that were cured by programming, but this sounds like way more slippage than programming would account for.
01-03-2007, 09:36 AM
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I HAVE DONE SOME RESEARCH ON THIS MATTER 3-4 CLUTCH PACK CLEARANCE. PEOPLE GO ANYWHERE FROM .025 TO .060. WHAT DO YOU RECOMMEND.
Originally Posted by performabuilt
since the converter is such a low stall , Im going with excessive clearance or failing 3-4
clutch causing the rev bump or slide I spoke of earlier
clutch causing the rev bump or slide I spoke of earlier
01-03-2007, 09:57 AM
#11
Well I have seen them with new frictions and steels come out near .100 and most shops will let that go from what I have seen, personally we set between .025 and .035 as a max with the understanding from testing that after a run in we will end up with a clearance around .040 to.060 depending on what type clutch set is used ,
You can actually verify this by installing a pack with near zero clearance will hardly move and frictions will only slide with a bit of effort, apply 150 psi air to them for 1 minute then recheck you will find they are no longer binding ,Considering thats lower than max line you can imagine that after driving it would be higher , So we set between .025 and .035 as our goal with a dry clutch set never applied.
hope this helps .
you can use different backing plates and or thin steels to achieve this just take a little try and measure but you can get it .
You can actually verify this by installing a pack with near zero clearance will hardly move and frictions will only slide with a bit of effort, apply 150 psi air to them for 1 minute then recheck you will find they are no longer binding ,Considering thats lower than max line you can imagine that after driving it would be higher , So we set between .025 and .035 as our goal with a dry clutch set never applied.
hope this helps .
you can use different backing plates and or thin steels to achieve this just take a little try and measure but you can get it .
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01-03-2007, 12:51 PM
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That Pro Street Series Will Hold All My Mods I Listed For Awile? I Mean I Don’t Think I Am At 500rwhp
I Suppose Your Prices Don’t Change If It’s The Rear Mounted 4l60e For The C5 Corvette
Do You Guys Buy Back Cores. How Much Considering I Pay Shipping Your Way.
I Suppose Your Prices Don’t Change If It’s The Rear Mounted 4l60e For The C5 Corvette
Do You Guys Buy Back Cores. How Much Considering I Pay Shipping Your Way.
01-03-2007, 03:10 PM
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Does anyone suggest anything that could be done to improve this shift problem before I replace it….can I get a better pump spring or servo spring…anything I can do by the bottom
01-04-2007, 02:38 PM
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Originally Posted by Ragtop 99
So you're saying that it upshifts at 5500 and then slips to 6000 and stays there?
Fluid is good?
Does it slip on lock-up at highway speeds if you step into the throttle?
How big is your stall?
Engine mods?
Years ago I remember that stalls over about 3000 on vettes had some issues that were cured by programming, but this sounds like way more slippage than programming would account for.
Fluid is good?
Does it slip on lock-up at highway speeds if you step into the throttle?
How big is your stall?
Engine mods?
Years ago I remember that stalls over about 3000 on vettes had some issues that were cured by programming, but this sounds like way more slippage than programming would account for.
If I am rolling 30 mph on 2nd and I stomp on the gas it slips about 1500 rpms up then catches goes back down the slips the shift into third. Tested it today : )
