4l60e hitting rev-limiter
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Launching!
Joined: Jan 2012
Posts: 269
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From: Attica, IN
4l60e hitting rev-limiter Ok so I put a new 4400 fti converter in my 99 trans am and made a couple pulls and did great now it smacks the Rev limiter 2 times before it shifts WOT. Would this be because I the shift points need adjusted coming from a 3800 revmax to the 4400 fti? Any help is appreciated. Oh I also have an aftermarket trans cooler too and trans was rebuilt last March and has maybe 6k on it if that. Thanks in advance.
Ok so I put a new 4400 fti converter in my 99 trans am and made a couple pulls and did great now it smacks the Rev limiter 2 times before it shifts WOT. Would this be because I the shift points need adjusted coming from a 3800 revmax to the 4400 fti? Any help is appreciated. Oh I also have an aftermarket trans cooler too and trans was rebuilt last March and has maybe 6k on it if that. Thanks in advance.
The tune needs to be looked at via Hp tuners and you need to do a data log of a run and see if you are meeting the mph/rpm for the shift to take place.
It might need adjusting
I would guess clutches and or band on it's way out, i talked to jeff from trutech and he was almost certain thats what was wrong with my car also. It was scary esp while spraying it. My buddy tried several tuning tricks on HP tuners and it helped some but still did it sometimes
TECH Fanatic
Joined: May 2016
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From: St. Louis
check your trans fluid first. I've always run my 4l60e's overfull, at least an inch or more above the full mark on the dipstick just to be sure. Somehow this tightens the wot 2-3 shift as opposed to having the fluid exactly in the hash marks when hot. The more you stress things the more fluid is flying around in there. You can't hurt the trans overfilling it either, it will just blow out the vent if you overdo it.
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Joined: Aug 2010
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From: Ann Arbor, MI
Since the OP only reported the problem after changing to a higher stall converter, I suspect that reducing the tune's "WOT Shift MPH" by a few percent will fix it.
However, if an unchanged setup starts hitting the rev limiter, I would also suspect the 3/4 clutch is worn if it occurs on the 2->3 shift; especially because this is one of the most frequently reported problems here. If it occurs on the 1->2 shift, then the band is likely worn.
I also suggest overfilling the trans by 1/2 quart if you have the stock shallow pan; it is not necessary if you have the truck or other larger capacity pan.
I don't agree with the "You can't hurt the trans overfilling it either" comment, but don't have the experience to know what then happens. The 1/2 quart overfill is fine.
Remember that the trans level has to be checked with the engine running; it will read about 1" higher on the dipstick with the engine off.
However, if an unchanged setup starts hitting the rev limiter, I would also suspect the 3/4 clutch is worn if it occurs on the 2->3 shift; especially because this is one of the most frequently reported problems here. If it occurs on the 1->2 shift, then the band is likely worn.
I also suggest overfilling the trans by 1/2 quart if you have the stock shallow pan; it is not necessary if you have the truck or other larger capacity pan.
I don't agree with the "You can't hurt the trans overfilling it either" comment, but don't have the experience to know what then happens. The 1/2 quart overfill is fine.
Remember that the trans level has to be checked with the engine running; it will read about 1" higher on the dipstick with the engine off.
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From: Turnin' Wrenches Infractions: 005
You need someone to log commanded gear, and actually see how long the trans takes to shift. Its not uncommon for the trans to take up to 500 rpms between asking it to shift and the actual completion of the shift......especially the 2/3 shift. You need to command it early enough that it completes it in time every time. If your tuner doesnt know how to do this find a new tuner.
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Joined: Aug 2007
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From: Turnin' Wrenches Infractions: 005
1/2 will almost be on point, maybe 50 to 100 rpm off. 2/3 will always be slower, again up to 500 rpms behind. Let's say you want to shift at 6500, or close to it. If you set both shifts to 6500 with a 6700 limiter, you're going to have constant issues. For that you would want to command 1/2 at 6450 and 2/3 at 6100 with a 6800 limiter. Now both shifts will complete between 6400-6600 with 200 rpm minimum to spare. A quick log with hptuners will show you the lag and you can fine tune (it will vary slightly each time hence why you have a built in buffer).