turbochargedrs

The reason for the question is that mine doesnt. If i hold the trottle down from 0 i can hit 60 and redline with out the gears changing and this seems way to early for a 3-4 change so it must be the 2-3 which mine isnt switching at when im full throttle. Is there anyway to change that?

tenpin842

Mine does the same thing, and its only at WOT. If I go part throttle it shifs fine.

Apeiron

Yes it should shift 1-2 and 2-3 at WOT.

camaronewbie

Sounds like time to hunt a rebuilder.

EliteCamaroZ28

NO NO NO NO NO!!! The tranny should shift up to 3rd gear at WOT. It will not shift from 3rd to 4th and WOT. Its just how the valve body is set. You can however, for about $35 (last time i checked, about 6 months ago), buy a deal that eliminates this. There is nothing wrong with the tranny, THAT'S HOW THEY'RE BUILT! hope this helps!

Pro Built Automatics

The Corvette servo & TransGo Performance Shift kit will solve most 2-3 WOT shifts. While the valve body is down you can modify the TV plunger bushing for about $.34, to allow a 3-4 WOT shift. This will prevent a 4-3 kickdown at high speeds.

firstfirebird

iTrader: (3)

Seems like that happens to a lot of people. Mine will shift 2nd to 3rd at WOT, only it goes to 5700 or so before doing it (in the yellow area on the tach). But since our 60* V6 cranks are forged, I don't mind red-lining my car
.
BTW second gear hits red at 80mph on the 3.1 cars - is that what you have?

tenpin842

My car shifts out of 1st at 5500 rpms, 2nd gear seems to stick and it doesnt want to shift into 3rd gear at WOT. Ill have to try a new corvette servo and I want to try the 3-4 shift valve to. Anyone know how hard they are to put in? I know the corvette servo goes on the side of the transmission. What about the 3-4 **** valve. Do I need to drop the pan down?

Another thing if you get bored, I didnt believe it until I did it a couple times. And I do it more now that I have my 3.73 richmond gear in. But keep your transmission in "low 1" and drive it. I bet it shifts into 2nd gear at 5500 rpms, even though you still have it in 1st gear. I guess theres a safety valve built in for stupid ppl like me who forget to shift up!

abyliks

sounds like the trans is slipping, second gear used to redline at 75ish and you would just keep hitting the limiter? thats what mine did

my stupid LO3 shifts at around 4500 RPMs how do you modify that

tenpin842

I dont think I have ever seen a 3rd gen with a tach that read more then 6500.
(6k then another 500rpms) I think my rev limiter is at 6200rpms or somewhere close by. If your going to 7500rpms.....thats alot.

firstfirebird

iTrader: (3)

My stock tach reads up to 8000, rev limiter kicks in at 6,000. My WOT 2-3 shift is at 5700 (just before redline). I think the 60* crank is rated to 7200.

Toehead

V6 Tachs do.

turbochargedrs

yea it because the V6's idle and run at higher rpms then the 305's which run and idle at higher rmps then the 350. Pretty much the bigger the engine the smaller the tach is going to be stock because there isnt a need for it. And ive had my tach read 7000 rpms one time, i redlined it for fun and at 7000 you hear/feel the tranny disengage the gear then it re-engages after the rpms have drop a few hundred.

Fast355

iTrader: (2)

I had a good laugh at that post. While it is true that the smaller engines have to turn faster to do the same work as the larger engine, the idle is all about the same. All three idle above 500 rpm and below 600 rpm.

That being said, the stock 700r4 behind my 2.8 TBI in my 1987 GMC Jimmy shifts at 6,000 rpm with the go pedal matted.

https://www.thirdgen.org/forums/diy-...l-new-use.html

The transmission in my 1991 G20 will do WOT 3-4 upshifts and it is stock. My 1983 has a 1992 4L60 non E from a 1992 G20 van in it and it will do the WOT 3-4 upshift as well. Above 80, it won't even back down to 3rd gear.

firstfirebird

iTrader: (3)

Now I had two laughs! All the automatics I've owned idle at 900-1000rpm when the trans is in park, you have to remember when depressing the brake and putting it in gear causes the engine to work against the torque converter in turn causing the RPM to drop to about 700. The standard trans engines idle at 600-700 all the time because there is no load on the engine with the clutch depressed.
.
BTW : That engine looks pretty good! I happen to be partial to the 6ers recently

turbochargedrs

they dont all idle between 500 and 600 if they are running correctly.
v6 auto-- 550rpm in drive
v6 manual-- 650rpm in nuetral
v8 auto-- 400rpm in drive
v8 manual-- 450rpm in nuetral
There is no way your car should be idling at 900 rpms tho, the only time this should happen is when you first start it and dont let it warm up. The cars are ment to idle up to warm up instead of the driver reving the engine. If you just drive while its trying to warm up when you stop or park it'll be at between 900 and 1100 on the v6's (i dont know what it is for the 8's).


rpm refernce is from haynes repair manual for 82-89 camaros and rpm info is on page 4B-2

Fast355

iTrader: (2)

Something has been wrong with all your V6s or the tachometer was off. I would not trust the factory tach at all. My 3.1/automatic idles at 600 RPM and has a cam equivalent to the F-303 ford grind in it. The stock setup idled at 550 rpm in Drive.

My TBI 305/350s all idle at 475-525 RPM in Drive, fully warmed up. The varience was due to the calibration and year model. My 1994 305 TBI had the smoothest idle I have ever felt at only 475 rpm in drive.

firstfirebird

iTrader: (3)

Not just V6's, I was talking general. I've got 3 trucks and my 3rd gen. I have to agree on the inaccurateness (is that a word?) of the tachs, though. With the stock tachs, you can't differentiate between 25RPM increments.
I'll have to dig out my analog tach and compare it to the stock one and get back...

firstfirebird

iTrader: (3)

Thenk you for that tid-bit of info!
I had a few minutes today and put the tachometer to test the waters of the stock tach.
At idle (in park) the GM tach read aprox 850RPM, according to my Craftsman tha actual RPM was more like 750.
Though the big surprise was the GM tach reading 2000RPM, it was really 1500!
It's hard to believe that my tach is that far off!
.
I wanted to try it on my F150 (4.6 modular) but don't know how to use my ancient (although accurate) tach/dwell meter with the twin coil packs.

cyko83

can any one tell me what the gear ratio on the 700r. cuz i need to know if its better then the 350 or 400 . thanks you for your time people

Apeiron

700R4: 3.06, 1.63, 1.00, 0.70
TH350: 2.52, 1.52, 1.00
TH400: 2.48, 1.48, 1.00

STOLN

iTrader: (1)

From my research I know WOT should go 1-2 then 2-3 then will redline as there will be no 3-4 shift unless you reduce throttle. The B4C cars had the valve in the tranny to eliminate this thus becoming Police cars. As said before you can get a valve for cheap and install it in the trans to eliminate this. My 91 L98 shifts fine.

Zepher

iTrader: (1)

Those are minimum idle speeds, not the actual target idle speeds.
The TPI motors have a minimum of 400 and 450 and have a target idle of 575 at normal operating temps.

High or low idle rpm on an ECM controlled motor usually means stuck IAC motor, according to my service manual.