eagle_eyes

iTrader: (3)

i have an '88 firebird with a '93 LT1. the transmission is a '92 700R4. the LT1 came out of a Z28, and was the only year LT1 to have a Throttle Valve (TV, detent) cable. the '93 4L60 was not electronically controlled, and as far as i know, only had a couple of extra sensors in it. it had 5 wires going to it instead of 3, like the 700R4.

the problem i'm having is the TV cable adjustment. if i adjust it to where the cable is fully extended when the throttle is fully open, it upshifts early and i'm in 4th at 35 mph. shifting is around 1500 to 1800 RPM. i can pull it out a little more, and everything is perfect, except i can't go full throttle without it readjusting itself.

to me it seems like the lever in the transmission is shorter than the lever on the throttle.

i've been through the governor about a dozen times, and no combination makes it any better without really messing up the high RPM shift point...which is about 5800 to 6000 right now. i can get it to shift better mid range, but i will be on the rev limiter each time and it won't upshift.

also, it doesn't like to downshift into higher RPM's if you go full throttle. driving 55-60 and flooring it, it goes into 3rd instead of 2nd (3.42 gears). starting from a stop, it holds 2nd until nearly 70.

3rd gen Will

iTrader: (8)

I have a 700r4 out of a 93 LT1 (has the gray round 5 pin connector) in my car and I am using my 91 factory cable and it is working fine.

I wonder if your issue is the distance from the TB linkage to the bracket being to far. Maybe the cable is too far extended at WOT so it pulls it out, but part throttle is shifts right. I am running a miniram intake so our setup should be relatively similar, there is right at 5" from the front edge of the Bracket my detent cable/cruise cable is in to the center of the pin that the detent cable attaches to.

Also I am not sure your familiarity with the TV cable, but moving it just one notch can make alot of difference.

Hope any of this helps!

eagle_eyes

iTrader: (3)

i have noticed how sensitive each click is

the distance on mine is 3 & 9/16". the cable adjustment should compensate for any variations in distance from bracket to throttle.

i just did something i didn't think about earlier. i measured my 91 v6 firebird and compared it to my LT1. they are the same distance and travel, and are set up the same. since that one works properly...i now know my problem is in the Governor.

eagle_eyes

iTrader: (3)

Is it possible to have the wrong governor in this transmission? When you do a recalibration on them, you only change the springs and inner weights. Were there different outer weights on different governors?

3rd gen Will

iTrader: (8)

From what I have read you cannot change the outer weights. You might try finding a later corvette govorner, it should be really close.

morgsie

iTrader: (1)

The TV cable adjustment is not meant to "adjust" the shift points. Read this site for correct adjustment procedure: http://www.jakesperformance.com/TV_C...etup_Info.html. You will burn up your transmission in short order if the TV cable is not adjusted correctly.

3rd gen Will

iTrader: (8)

blah blah....read the guys post. He has initially set it per the instructions, then set it "tighter" for lack of a better term and it re-adjusted itself.

eagle_eyes

iTrader: (3)

Lol, yep.
Wide open, it shifts where it needs to...from a stop. Light throttle, it shifts early, and doesn't downshift into the gear it should.

I found something called a throttle valve correcting spring. I've never seen or heard of one before in my 14 years of GM "tinkering". It is a small spring that goes on the end of the cable at the throttle and pulls the cable past the connector on the end a little. This gives it more tension on light throttle. When you go full throttle, the spring compresses with the tension of the cable. Sounds odd, but for a few bucks, I'm willing to guinea pig it.

If not, I'm switching governors and starting over. The governor vs the T.V. Cable is just a tugofwar of fluid pressures. I'm trying to prevent this thing from burning up by not downshifting when it should.

3rd gen Will

iTrader: (8)

What you are talking about sounds like the sonnax spring I have heard mentioned on here.

eagle_eyes

iTrader: (3)

The sonnax spring I got years ago went in the accumulator near the valve body. It stiffened up my 1-2 shift quite a bit. This thing is a small spring, like what you would find in a click pen...only a lot stiffer. I'll post some pics when I get it in and on the car.

eagle_eyes

iTrader: (3)

Here it is. Haven't tried it out yet, but seems like the concept will work
Attachment 256712

3rd gen Will

iTrader: (8)

I see what you are saying. As long as it doesn't cause your part throttle shifts to hang I don't see why it wouldn't work great.

eagle_eyes

iTrader: (3)

After 3 months with the spring, still no problems. However, I was still curious what the underlying problem was...so I pulled the governor back out, and pulled the one out of my other firebird to compare it to. My governor had a lot more material on the outer weights, which don't get changed with recalibration kits. So I cut the extra material down and tried to match it to the other governor. Put it all back together, and it shifts good, without the spring. Not sure why this one was different. The only thing I could think of is maybe it came out of a truck originally, WOT was at 4,000 before I ever started messing with it. Now it's about 5,800, with part throttle between 2,000 and 2,500, depending on acceleration.
I would still use the spring if presented with this problem again...at least until I could get time to play with the governor.

valencia88iroc

I have the Exact same problem! called autozone and oreilly and they don't show anything called a throttle valve correcting spring. Where can I find it? Really need it. Part #? Thanks! and I hope this works! will save me about 1,000 for the rebuild of my old tranny.

eagle_eyes

iTrader: (3)

http://www.transmissioncenter.net/highperf700r4.htm

#42

scandrett

So A 89-92 TV/detent cable will work with a 93 LT1 TB?