Downshift @ 130?
Thread Starter
Racer
Joined: Jun 2002
Posts: 411
Likes: 0
From: Palm City FL
Downshift @ 130?
Did some real high speed driving tonight and noticed if I keep my foot
to the floor, at 130 it tries to downshift, doesn't, then tries again. After
about the third time, I roll off to 3/4 throttle, then slowly roll into it where it
will go on up into the 140's with still throttle left (then I get chicken). I don't
floor it from this point. Does this sound normal? Is anyone else stupid
enough to try this? :confused: :D :eek:
to the floor, at 130 it tries to downshift, doesn't, then tries again. After
about the third time, I roll off to 3/4 throttle, then slowly roll into it where it
will go on up into the 140's with still throttle left (then I get chicken). I don't
floor it from this point. Does this sound normal? Is anyone else stupid
enough to try this? :confused: :D :eek:
Race Director
Joined: Oct 2002
Posts: 13,717
Likes: 5
From: RI
Re: Downshift @ 130? (severe-1)
Sound like the TV cable on the transmissions need to be reset. I'd look for the cable reset procedure which I've witnessed from Gordon Killebrew, its real simple. That should solve your transmission downshifting issues
kitt
kitt
Thread Starter
Racer
Joined: Jun 2002
Posts: 411
Likes: 0
From: Palm City FL
Re: Downshift @ 130? (kittmaster)
Good point about the TV cable. I had not thought about that. I automatically
jumped to "its tranny time" and skipped the less expensive route. Besides,
it one of those things I haven't f'd with yet.
jumped to "its tranny time" and skipped the less expensive route. Besides,
it one of those things I haven't f'd with yet.
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Re: Downshift @ 130? (severe-1)
The 700R/4 in a Corvette has a special 3-4 upshift sleeve that prevents downshifts at WOT. In fact putting the Corvette 3-4 upshift sleeve into the A4 in an F-body is a stardard upgrade to prevent downshifts at WOT.
Maybe someone did a rebuild or put an F-body A4 into your Vette.
You can try the TV cable adjustment but I don't think that's the answer here.
Maybe someone did a rebuild or put an F-body A4 into your Vette.
You can try the TV cable adjustment but I don't think that's the answer here.
Thread Starter
Racer
Joined: Jun 2002
Posts: 411
Likes: 0
From: Palm City FL
Re: Downshift @ 130? (65Z01)
I have a 700 in a Malibu also. It has the Camaro trans, and a hard hitting
shift kit. It will never go into fourth under WOT. The vette goes into fourth
wide open, but for what ever reason right at 130 acts like its going to down-
shift. It never actually goes into 3rd though. I wonder if the torque converter
is unlocking or slipping?
shift kit. It will never go into fourth under WOT. The vette goes into fourth
wide open, but for what ever reason right at 130 acts like its going to down-
shift. It never actually goes into 3rd though. I wonder if the torque converter
is unlocking or slipping?
Burning Brakes
Joined: Feb 2003
Posts: 1,212
Likes: 0
From: OH
Re: Downshift @ 130? (severe-1)
hmm, I had this problem and thought the 3-4 servo for the Corvettes would not allow 4th gear at WOT. Because when I had a nice long strech of road I got to 133 then it wanted to shift to 4th, but wouldn't until I let off the gas a little. Then if I put any more then about 2/3 throttle it would want to downshift to 3rd. Its a 85 Auto. I thought this was normal, and with a servo upgrade you could get it to hold WOT in 4th.
Would really like to know which is correct?
Would really like to know which is correct?
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Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Re: Downshift @ 130? (rsafier)
Well, Level-10 (performance tranny shop in NJ) sells the Corvette 3-4 servo as an "upgrade" part to allow upshifts at WOT.
I've had my Vette on the dyno and the TC will lock up around 120-130 in 3rd gear but don't know about 4th. So far I haven't had it up to that speed in OD on the dyno or highway.
I've had my Vette on the dyno and the TC will lock up around 120-130 in 3rd gear but don't know about 4th. So far I haven't had it up to that speed in OD on the dyno or highway.
Drifting
Joined: Mar 1999
Posts: 1,250
Likes: 1
From: Greensboro NC
Re: Downshift @ 130? (65Z01)
All Corvette 4L60(E) will upshift from 3rd to 4th under WOT.
The same tranny in passenger cars will not!
Upshift from 3rd to 4th in my car occurs at 145 mph and I have tested it. See also the "Corvette Specs" book for upshift mph for all C4 years and models, axles.
The same tranny in passenger cars will not!
Upshift from 3rd to 4th in my car occurs at 145 mph and I have tested it. See also the "Corvette Specs" book for upshift mph for all C4 years and models, axles.