4l60 problem with nitrous only
Thread Starter
Teching In
Joined: Jul 2012
Posts: 34
Likes: 0
From: Texas
4l60 problem with nitrous only I got a rpm lv. 5 4l60e. I just ran it at the track and it will shift good on just motor no problems at all. But when I add a 100 shot to it it will not shift from 1 to 2 just bangs off the limiter till i let off the gas then will shift . I have a window switch set to shut off 200 rpms before the shift. Car shifts at 6400 and has been tuned for nitrous made 524whp on 100 shot. Any ideas?
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Joined: Aug 2010
Posts: 7,323
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From: Ann Arbor, MI
The band is not engaging tight enough.
Who's "level 5" is it?
Sorry, but I don't think a Level-5 from e.g. FLT or RPM would have this problem unless it had a lot of miles/abuse on it. If it is from them, contact them for a refresh.
Otherwise, the trans needs the following parts which can be installed without removing it:
1. A .490/.500 boost valve - such as the Sonnax 4L60-LB1.
2. The largest 2nd gear servo - such as the Sonnax Super-hold #77911-03K
(This is difficult to install with trans in an F-body, but not impossible.)
3. The 1-2 accumulator should be checked to ensure the piston is not cracked.
This is a good time to install an aluminum piston or a Sonnax Pinless piston.
It is also important that the tune be set for max line pressure during WOT shifts.
Of course, if the band is worn and/or low quality, the trans will need to be removed and rebuilt.
Who's "level 5" is it?
Sorry, but I don't think a Level-5 from e.g. FLT or RPM would have this problem unless it had a lot of miles/abuse on it. If it is from them, contact them for a refresh.
Otherwise, the trans needs the following parts which can be installed without removing it:
1. A .490/.500 boost valve - such as the Sonnax 4L60-LB1.
2. The largest 2nd gear servo - such as the Sonnax Super-hold #77911-03K
(This is difficult to install with trans in an F-body, but not impossible.)
3. The 1-2 accumulator should be checked to ensure the piston is not cracked.
This is a good time to install an aluminum piston or a Sonnax Pinless piston.
It is also important that the tune be set for max line pressure during WOT shifts.
Of course, if the band is worn and/or low quality, the trans will need to be removed and rebuilt.
Thread Starter
Teching In
Joined: Jul 2012
Posts: 34
Likes: 0
From: Texas
Its a rpm lv. 5 milage unknown came with car when i bought it. Car is tuned for the 100 shot ran fine on the dyno. It will shift manually no problems. Going to pull the pan in a week and report back
