700R4 question for Pete K
Thread Starter
Racer
Joined: Sep 2007
Posts: 493
Likes: 0
From: Eden Utah
700R4 question for Pete K
Pete and or any other knowledgable person,
Is there anyway to get an early 700R (85 corvette) with shift kit to shift above 4800 rpm. Currently shifting by hand at 6500 rpm. One of my friends says we should be able to, but have had the trans to several shops and they cannot get it to shift above 4800.
Thanks,
Wayne
Is there anyway to get an early 700R (85 corvette) with shift kit to shift above 4800 rpm. Currently shifting by hand at 6500 rpm. One of my friends says we should be able to, but have had the trans to several shops and they cannot get it to shift above 4800.
Thanks,
Wayne
Team Owner
Joined: Dec 2007
Posts: 20,974
Likes: 261
some here have played with weights, or modified for different shift points
Aardwolf is one I think that posted pics of his while he worked on them, and I am sure more
http://forums.corvetteforum.com/c4-t...nor-recal.html
Aardwolf is one I think that posted pics of his while he worked on them, and I am sure more
http://forums.corvetteforum.com/c4-t...nor-recal.html
Le Mans Master
Joined: Jul 2007
Posts: 5,043
Likes: 8
From: Tampa Florida
Thread Starter
Racer
Joined: Sep 2007
Posts: 493
Likes: 0
From: Eden Utah
Le Mans Master
Joined: Jul 2007
Posts: 5,043
Likes: 8
From: Tampa Florida
Le Mans Master
Joined: Jul 2007
Posts: 5,043
Likes: 8
From: Tampa Florida
some here have played with weights, or modified for different shift points
Aardwolf is one I think that posted pics of his while he worked on them, and I am sure more
http://forums.corvetteforum.com/c4-t...nor-recal.html
Aardwolf is one I think that posted pics of his while he worked on them, and I am sure more
http://forums.corvetteforum.com/c4-t...nor-recal.html
Good thread!
Thread Starter
Racer
Joined: Sep 2007
Posts: 493
Likes: 0
From: Eden Utah
I don't know what the upper RPM limits are with weight mods.....lighter weights make the WOT shift points go up and the heavier weights make the WOT shift points go down. Typical weights only weigh 10 - 20 grams each. You may end up changing the valve body springs to increase the shift points to what your after.....Pete K would/will know which direction to lead you down for sure.
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Brett Foote
Race Director
Joined: Jun 2004
Posts: 13,957
Likes: 706
From: WI
It only takes 10 mins to change and grind the weights but to get it where you want it you might make make 10-20 attempts. 6,500 RPM is possible. You can attempt to grind your weights down but you may want to have a gov recal kit on hand if you make them to light. Or you could weld weight on to correct. A shift kit won't change the shift RPM.
Didnt do that again.
Thread Starter
Racer
Joined: Sep 2007
Posts: 493
Likes: 0
From: Eden Utah
ok- if I am reading this correctly we can do this for all shifts at least the 1-2 shift and the 2-3 shift. Up on the rack and then down for a test drive then back up etc, etc... Wonder what they will want to charge me for that...
Race Director
Joined: Apr 2003
Posts: 17,700
Likes: 1,667
From: moraga ca
Buy a couple of kits and try it yourself. You only need to jack up the driver's side of the car. You can use lighter weights and lighter springs to get the car to shift at a higher rpm. The only problem is that it will also affect the part throttle shifts. I must have had my car up and down 20 or 30 times trying to dial it in. I was filing weights, adding solder to weights. Came close, but not perfect. Switched to a 4l60e with a stand alone controller. Part and full throttle shifts can be dialed in with a laptop.
Thread Starter
Racer
Joined: Sep 2007
Posts: 493
Likes: 0
From: Eden Utah
Buy a couple of kits and try it yourself. You only need to jack up the driver's side of the car. You can use lighter weights and lighter springs to get the car to shift at a higher rpm. The only problem is that it will also affect the part throttle shifts. I must have had my car up and down 20 or 30 times trying to dial it in. I was filing weights, adding solder to weights. Came close, but not perfect. Switched to a 4l60e with a stand alone controller. Part and full throttle shifts can be dialed in with a laptop.
Thanks everyone....
Advanced
Joined: Nov 2005
Posts: 95
Likes: 0
From: VA
You can dial them in pretty easily with a $30 kit. With a kit you can always revert back to your older setting. Otherwise you’ll grind and adjust springs 30 times plus. Me I prefer to hand shift "the shift points”. I just put in a transgo 2-3 and didn’t mess with the govy.
I like chirping tires with my 2:59 gears LOL
oh and 4l6e is not weak if you build it right (max600-700HP safley)
I like chirping tires with my 2:59 gears LOL
oh and 4l6e is not weak if you build it right (max600-700HP safley)
Max G’s
Joined: Nov 2008
Posts: 2,751
Likes: 78
From: Monroe OH
NCM Sinkhole Donor
Okay, I don't know much about transmissions, especially setting them for shifts on the 700r4/4l60. My shop manual says the only way to set the shift points is through the TV Cable adjustment. Please enlighten me. 