Is there a way to make your 700r4 stay in overdrive if you want it to. For example, I can be going 120 and if I mash it to the floor it kicks down into drive, redlining the tach. YOu have to let it up half way to get it to go back into overdrive. Is there anyway to fix this. Or is this just a typical 700r4 thingh. WOuld really like to be able to hold the gas down at 120 without it kicking down. At half open throttle at 120 it just doesn't pull like it could if I could floor it.

 

Mine does that to, it sucks. I think that my car started doing it after I installed a shift kit.

 

mine has done that since ive had the car. i got a brand new tranny for my car and that one does the same thing. i think they are supposed to do that. and of course it wont pull like it should cuz its in overdrive.

 

I know it is supposed to do it. Just wanted to know if there is a way to get it to lock out when you want it to. Anyone know of a way???????

 

corvette servo will hold til about 3/4 throttle

 

it is supposed to do that, do a search on the tranny board for "skip shift" and see what you find. they make a modification to eliminated this feature.

 

You can buy a shiftkit to get rid of this, it is built like that.

 

that part is a gm part and is used on police cars (caprice). so you have to buy the police packedge full throttle overdrive kit that lets you do just that. any good parts man at a dealer will know what you are talking about.

thanks
anthony

 

I think summit or jegs sells the skipshift eliminator in theyre catalog.

 

Go to summit and put in part number BMM-70237. That is what you are looking for.

This link might work also:

http://store.summitracing.com/defaul...rchtype%3Decat

 

What is the reason for the trans to do this?

 

it's a safety feature...if my knowledge serves me correctly, the only way (except for the skip kit) to keep the 700R4 from shifting out of OD is to keep the pedal less than 3/4 to the floor.

 

that skip shift thing your talking about is for the 6 speeds I believe.

 

This is a tranny problem actually.

I bought a new Raptor Jr tranny because my old stock one went out. I noticed they offered this option, and picked it up myself:

#20. 700R4 full throttle 3-4 up-shift sleeve. Now you can have a full throttle 3-4 shift. At 80 MPH it takes 90% throttle to make a 4-3 downshift. Can be installed without removing the valve body. The Up-shift Sleeve also eliminates part throttle 4-3 downshift for less gear searching. Can be ordered as an extra option on the 700 Raptor. Cost $49.00

They sell the part by itself too. It's basically a part which let's you keep in 4th gear on the highway, mine always used to stay in 3rd gear when i was going 80-100 mph. Hated it, because gas mileage sucked ***.

http://www.transmissioncenter.net/Al...ions.htm#700R4

 

You need a different boost valve, do not use b&m it messes up your shift points and it doesent work. i am pretty sure gm has .500 boost valve that will work, A servo just applies more surface to the band which causes a firmer shift, a shift kit creates a faster and safer shift, I have about 2600.00 into my 700r4

 

It's probably there for several reasons. Here are my guesses:

Safety. If they can get to that speed in third gear, imagine overdrive.

Acceleration. If you're in overdrive cruising at, say, 70, and you floor it, without that little option it might just keep it in 4th gear and accelerate in overdrive.

But as mentioned above, there are ways to get around that.

 

Na, not true, the tranny kicks down at certain speeds, the boost valve which is the thing that is messing his tranny up IS a safety procautionwhich you said, it just dont let you go to 4th gear at wide open throttle, gm has a igh performance boost valve that will work, I have a boost valve from sonic transmissions, it works excellent. If you do drop the tranny to do the valve make sure you dont get b & M they suck, also get a trans go shift kit and a super servo and some kevlar bands

 

THAT SOUNDS LIKE THE RESTRICTER PLATE (GOVENER). MY CAR DID THE SAME THING UNTIL I HOOKED IT UP TO A COMPUTER AND SET IT HIGHER. IF YOUR CAR IS REALLY GOING INTO DRIVE HOW CAN YOU TELL AND HAVE THE TRANNY CHECKED OUT! GOOD LUCK HOPE ITS JUST THE PLATE

 

What's the story on this Govenor thing? At 110MPH my car just goes dead. I have a rev-limiter set at 5 grand and if my car was kicking out of overdrive at that speed, third gear could send the revs over 5000.
If so, this Governor is adjustible, right?

 

My car is non computer controlled, so I think it is safe to say it is not the governer. It's not kicking off, it is kicking down into drive. I just want it to stay in overdrive.

 

governor is mechanical and in the transmission. Has nothing to do with computer. Trans governor controls shift points combined with TV cable in the non computer controlled transmissions.

There is a speed limiter on the TBI cars that will shut off the fuel at 108mph that can be programmed out.

 

NONE OF THE CHEAP AND EASY WAYS OF ELIMINATING THIS DOWNSHIFT WORK. The "downshift eliminators" that are sold by various places for a few bucks only delay the downshift, but they won't work at 100% throttle. NONE OF THEM.

You need to modify the valve body to prevent downshifts into 3rd at WOT. This is the ONLY way to do it. Installed the B&M kit for doing this, firming the shifts and installed a Corvette servo (not required, but it helps the shift firmness quite a bit) on brother's 87 GTA last summer. Now we've got OD at full throttle and firmer shifts too. The B&M kit works. If it doesn't then you installed it wrong, but there's nothing wrong with the kit.

The reason GM didn't allow OD at WOT in earlier 700R4s (before about 1990) is that they felt the tranny internals weren't up to holding the torque of a V8 in OD, plus all the heat that was put into the tranny fluid. It was done, essentially, for reliability and warranty reasons.

 

Like said above, the 700r4 has a speed limiter to keep folks from going 120+.
To get rid of it DO NOT get the B&M part Summit sells. This replaces the TV kickdown sleeve to allow the tranny to shift later. This is not the ideal way to do it.
Someone above mentioned the GM Police Interceptor sleeve/valve. This actually replaces the 3-4 upshift sleeve/valve in the valvebody. This is the right way to fix the problem, albeit somewhat messier as installation goes. With this valve, you can hold the throttle all the way to redline in overdrive. How do I know.......cuz I have it in mine!
I don't know about the availability through GM anymore, but TransGo sells just this sleeve and valve. I believ its $40 bucks. I have the TransGO one which is the same piece as the factory GM one.
It also comes with different springs to adjust the actual shift timing into 3/4