WOT shift
Thread Starter
Instructor
Joined: Jun 2005
Posts: 193
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From: woodinville washington
WOT shift
i just got my 91 A4 back from having the tranny rebuilt, and now she wont shift to overdrive at full throttle, even when i hit 5500 RPM's in 3rd. did the trans shop screw up? should i get a WOT shift to OD?
thanks
thanks
Team Owner
Joined: Jun 2005
Posts: 46,295
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From: Northern, VA
St. Jude Donor '15
"In honor of jpee"
Just an observation on my part, I think it should. Every automatic I know eventually shifts to top/od gear. The key word is eventually. Maybe you're still in kickdown at 5500 rpm? I'll look to see what the answer(s) is.
Le Mans Master
Joined: Aug 2000
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From: Australia
Race Director
Joined: Sep 2000
Posts: 17,298
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From: The Top of Utah
Originally Posted by REDC4CORVETTE
If it's a 3 speed 
it may not have a 4th gear.
What are you driving,Maybe its a 6 speed and you have to shift it.
it may not have a 4th gear.What are you driving,Maybe its a 6 speed and you have to shift it.
HUH???
Originally Posted by yellow dragon
i just got my 91 A4 back from having the tranny rebuilt
RACE ON!!!
Team Owner
Joined: Jun 2005
Posts: 46,295
Likes: 2,596
From: Northern, VA
St. Jude Donor '15
"In honor of jpee"
CFI, correct an impression that I have. Even tho most trans go to kickdown at wot, don't they eventually up shift into the highest gear at some point? Or, in this case, does the Corvette A4 actually stay in 3rd as long as wot is used?
Safety Car
Joined: Apr 2004
Posts: 4,532
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From: Lahaina Hi
My 4L60E up shifts at around 135 mph and even with a trans go shift kit in it the up shift is weak at best when it goes into high gear.
I think you car has an up shift light ,cruise in 3rd at about 65 and see if the light comes on.
I would also check the plugs on the trans .
One with 4 wire connector and a 2 wire connector,the 2 wire connector usually does not have a very long wire.
And just incase I would check the fluid,usually will effect all the gears but you never know.
I think you car has an up shift light ,cruise in 3rd at about 65 and see if the light comes on.
I would also check the plugs on the trans .
One with 4 wire connector and a 2 wire connector,the 2 wire connector usually does not have a very long wire.
And just incase I would check the fluid,usually will effect all the gears but you never know.
Last edited by REDC4CORVETTE; Aug 28, 2005 at 01:55 AM.
Team Owner
Joined: Dec 2000
Posts: 90,675
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From: SE NY
Cruise-In II Veteran
No they do not. When I had the A4 in my IROC rebuilt I had the perfomance shop install the Corvette 3-4 upshift sleeve so that it would up**** into 4th at WOT.
Another possibility is that the governor is not setup right, so that the 3-4 shift point is above the max rpm of the engine. Look at the spread in the 1-2 vs 2-3 shift points to get some idea of where the 3-4 shift should occur. For example my 1-2 comes in at 5,200rpm and the 2-3 is at 5,700rpm so I would expect the 3-4 to be around 6,200rpm, as a guess.
Another possibility is that the governor is not setup right, so that the 3-4 shift point is above the max rpm of the engine. Look at the spread in the 1-2 vs 2-3 shift points to get some idea of where the 3-4 shift should occur. For example my 1-2 comes in at 5,200rpm and the 2-3 is at 5,700rpm so I would expect the 3-4 to be around 6,200rpm, as a guess.
Last edited by 65Z01; Aug 28, 2005 at 01:51 AM.
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Safety Car
Joined: Apr 2004
Posts: 4,532
Likes: 7
From: Lahaina Hi
My L98 would never see 6200 on it's best day.I would check the spring in the modulator.
Also see if the trans converter unlocks when slowing down should feel like it is freewheeling.
Or they could have forgot the check ball for 3-4 fluid transfor in the valve body.
Also see if the trans converter unlocks when slowing down should feel like it is freewheeling.
Or they could have forgot the check ball for 3-4 fluid transfor in the valve body.
Race Director
Joined: Sep 2000
Posts: 17,298
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From: The Top of Utah
Originally Posted by LT4CompYell
CFI, correct an impression that I have. Even tho most trans go to kickdown at wot, don't they eventually up shift into the highest gear at some point? Or, in this case, does the Corvette A4 actually stay in 3rd as long as wot is used?
RACE ON!!!
Race Director
Joined: Sep 2000
Posts: 17,298
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From: The Top of Utah
Originally Posted by REDC4CORVETTE
not have a very long wireOne with 4 wire connector and a 2 wire connector,the 2 wire connector usually does not have a very long wire.
Originally Posted by REDC4CORVETTE
I would check the spring in the modulator.
RACE ON!!!
CFI-EFI is right on target. I'd bet they used a non C 4 tranny.
