Hey guys i know how in stock form the 700r4 will not allow WOT in OD (4th gear). I know the various other benefits of the Transgo kit but i was wondering if by installing the transgo kit it would allow WOT in OD?

 

Nope.
You have to change a valve in the valve body.

 

Summit has a kit, made by B&M
700R4 Downshift kit.
Part # BMM-70237
I know because I put a 3.73 gear in my car. I havent got this yet but I will when I get my car out in the spring.
The kit has a modified valve that allows the tranny to kick down from 4th to 3rd only at 2/3 throttle or more, so you can cruise in overdrive at high speeds.
When I got that 3.73 (stock 2.72) I was pinging off the rev limiter because it wouldnt shift into 4th gear. Pick ur foot off the gas and let it shift.....then put it to the floor again and it would downshift again.

Anyone else chance this yet?

 

Ah that sucks. I'm gona be totally honest...My dad payed for a lot of my car, and even though i take car of it completely and pay for any parts/gas that go into it...he still can veto any mods i want to do. Shift kit is cool because it lets you accelerate faster and also extends the life of the tranny, but for me to be like 'yea i want a kit so i can cruise in OD at over 100MPH' he would be like 'WTF your not driving anymore!'.

Oh well, its not like i take my car up that high..but its more of the capability to drive the car fast for me. I do have another question though: If one were to try to make a top speed run, and you were at WOT all throughout 3rd until it redlined, if you took your foot off the gas enough to let it upshift to OD, would the car continue to accelerate (just at a slower rate), or would the acceleration stop completely????

 

Dad's are usually pretty smart . You really do not need the kit. Most of the time, you will not be shifting into 4th with 3rd gear wound out. This shift happens at approx 125mph on my car. I actually appreciated this feature when running at Pocono raceway. Otherwise, for me, it is a useless addition. The valve that prevent wot upshifts into 4th help the 3/4 clutch pack live.

 

Yea, not to mention that my dad was a Gm mechanic in the 80's. Any mods i do will be done by him, so not only does he technically own the car but he also is my mechanic, haha. Now my question is, are you sure that 3rd gear redlines around 125 MPH with 2.73s/700r4? I dont really know because the highest i had my car up to was around 105 once and it remember it was past 4000 RPMs then (and i ***** my car around so that was really high RPMs for me so i backed off ) .

 

125 mph is what my speedo read in my 87 vette. 3:07 gears 700r4.

 

well put it this way you will be in 3rd gear at WOT.
When you take your foot off the gas it will shift into 4th gear. I like to race a little thats why I'm getting it. Plus the 3.73 gear bumps up the RPM's a bit

 

On TBI cars, you have a "Speed Limiter" in the eprom that limits the maximum speed the car can go. Only TPI cars with the auto don't have a "Speed Limiter". But 1991 (and earlier) still have the "WOT Upshift from 3rd to 4th" issue unless the tranny is modified as Floor Guy states.

Also, many 1992 TPI w/autos do not have the "WOT upshift 3/4" issue. GM made some changes in 1992 to the tranny for F-bodies so some don't have this problem as well as the most TPI Corvettes with the auto (to my knowledge).

 

Oh i know i have the speed limiter, its set at 118 MPH. I am using hypothetical situations... I do actually plan on doing some chip work eventually which would include taking that off, or atleast setting it to a higher speed. What i was asking is would my car even get to 125 MPH in 3rd gear like floor guys corvette did?

 

transgo does make a kit that allows the 3-4 upshift at wot. it just doesn't come with the shift kit. contact transgo for more info. i would get the one made by transgo as opposed to the b&m one or the sonnax one.

 

GM actually makes one too.

 

woah, is this true? ive been told shift kits decrease the life of your tranny... an explanation would be cool

 

The transgo shift kit is designed to change the inherent flaws of the 700R4. The B&M on the other hand just ramps up the pressure and doesnt really fix anything. Transgo will help extend the life, B&M will not.

 

what about the GM one?
I had the part # somewhere and it was 1/2 the cost of the others.

 

How's about those #s? Ok,....please

 

How's about those #s? Ok,....please

 

i thought that a shift kit would improve the life of a tranny cause it would make the shifts harder = less slip between gears. just like if ya drive a clutch if ya slide into the gears with a lot of slip to make it smooth you will kill the clutch much faster than if ya do it fast and firm. i dont mean Dumping the clutch either. the shift kit takes a lot of the slip out and thats why it helps performance, less power gets wasted as the trans is shifting. one might give better results over another but any time you shorten the time the trans is sliping will improve its life.

 

Transgo = GARBAGE

http://forums.corvetteforum.com/show...00&forum_id=48

 

whats the best one? I will be getting one in the next couple months.

 

how can i tell what shift kit i have? will i be able to tell if i drop the tranny pan?

 

Here's a question: Can't he just add a Corvette servo to his tranny and have what he wants?

Talk about a cheap and easy to install mod...

 

I'd sure hope that you could. If I could get to 110 MPH in a stock 175 HP carbed 305 G-Van, your camaro better run atleast 130!