newby

Well, I finally made it to the track tonight, and once again the issue of not being able to go WOT in 4th came up. I finished the 1/4 at nearly 6500 rpm in 3rd, and I think if I could get the car to shift into 4th, I might be able to shave off another .1 or .2. I know there's a way to do it, anyone know? And how would that affect the lock-up on my torque convertor? Would it just shift into fourth, and not lock up until I let off the throttle or what?

smallwood

When I had my 3rd gen I could swear I found a chip or something to fix that. Now I can't find who makes or sells it. Has anyone else heard of this or have I lost it?

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Little red light on the highway; big green light on the speedway, hey,hey, hey!

2002 Formula, GMMG cat back /1983 Z28-sold

RedIrocZ-28

newby, I bought and installed the Trans-Go Shift kit with the servo out of the Corvette. I am not sure which of these parts did it but I have WOT Overdrive now. TransFixLeo would be able to tell you but I haven't seen him around lately. See if IROC5.7TPI chimes in. I think he knows what will help you out.

newby

When I had my transmission rebuilt, they said they put a shift kit in it, not sure which kind, and said they put corvette servos in it too. So I wonder what the difference is. All I know is it drives me crazy not being able to do WOT in 4th.

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1986 Z28
383 ci Stroker, Dart Sportsmen 2 heads, roller rocker arms, Crower Hot Street Beast cam, edelbrock 750cfm carb and performer rpm intake, Corvette Servos, shift kit and 2600 rpm stall convertor, 3.73 gears and Eaton limited slip posi rearend.

First and only 1/4 time:
14.344 at 95mph with a 2.1 60 foot.
Altitude corrected:
13.5 at 100mph
Some practice and some street slicks should see me in the 13's, 12's corrected

phoenix916

The easiest thing I can think of is disconnect your kick down cable while your at the track and manually shift. Theres got to be another way but that is free, just my .02.

newby

Well, I manually shift it anyway, so that might work as a temp fix, but I really want it to be fixed all the time for those impromptu freeway races.
And if I disconnect my kick down cable, will my torque convertor lock up in 4th because I don't think that would be good, or will it stay open until I get off the throttle?

phoenix916

[QUOTE]Originally posted by newby:
Well, I manually shift it anyway, so that might work as a temp fix, but I really want it to be fixed all the time for those impromptu freeway races.
And if I disconnect my kick down cable, will my torque convertor lock up in 4th because I don't think that would be good, or will it stay open until I get off the throttle?

[/Q


The torque converter will still lockup. It only locks up under throttle. I put a 93 LT1 in my 92 bird and I put a manual switch in for lock up on the highway.

DARCOM

b&m sell a part that goes in your tranny
the part# is bmm-70237 whin i put it in i had no problems going at full trottle in overdrive.

you can see my simple site at:
http://darcom.org


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388,SuperRam,vortech R trim,NOS
duel exhaust

Z28ROC

DARCOM, that is one badass Z28 you got there.


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Mario,
White 94 Z28
Yeah I got a few mods
Video
Black 87 IROC-Z

phoenix916

Summit catalog says that will make it downshift at 2/3rds throttle instead of part throttle. I definitely think that will work if you have an adjustable kick down cable.

Big454blockchevy

There is a GM kit available so you can shift into 4th at WOT. I can't think of the part # right now but I will post it later on. I installed the B&M kit and it still downshifted into fourth at WOT so I went with the GM kit and fixed that.

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86 Z28
383 stroker> 400 steel crank > Dart Pro 1 Alumn. heads 2.05/1.60 Valves (215cc) Victor.Jr intake,Doug Herbert Hydraulic roller cam.specs 240 at 050 525/525 lift-- 770 Holley Avenger> 4.10 gears> 2500 stall> True dual exh. Hooker headers> MSD Ign.ALSO 78 Camaro Z28>>>454 BBC, Doug Herbert Cam-max lift .546,750 Holley carb,Roller rocker arms,Headers,700R4 beefed up tranny,shift kit,2800 stall, new axles,3.90 gears,posi unit-new wheels and tires,B&M shifter.

DarthIROC

Ok I now this is gonna be somehting really simple that just going over my head but someone tell me what WOT stands for.

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I find your lack of faith disturbing

86 IROC .040 305 TPI
#186 Heads shaved .040 1.98 valves
Shorty Headers 3 in exhaust with Flowmaster
Lunati 259/271 .500/.515 cam
Highly Modified 700-R4
B&M Slapshifter
3.55 Posi Rear
Accel Plugs and Wires
Petronix Flamethrower Distributor
Cragar 15x7 front 15x10 rear

newby

WOT stands for Wide Open Throttle

jd13

I'm guessing you have an automatic. If you have it in D that is just like 3rd. The only way to go into 4th is to put it into OD. Now I'm sure there are ways around it, I don't know any though. I could be wrong though...

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1990 IROC-Z 5.7l
1/8: 8.9 at 77 mph with a 1.99 60'
- 3" exhaust no cats, slp headers, underdrive pulleys, 160 stat

86 IROC

Damn it all if I couldn't find the slip for the part I bought from GM. It's called a "Caprice Repair kit" - set me back $15 and allows 3-4 WOT upshifts. If I should find the slip or the part #, I'll galdly post it.

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1986 IROC-Z, 8pt. cage, 383, Mini Ram, DFI, Art Carr 700R4, 12 bolt.....