I have a 1995 Z28 with Auto trany. after starting at wot the engine will not shift (where I think it should 5600), it goes to 6000-6200 and freespins, missing the 2nd gear shift. This engine is 100% stock with 85K miles. I just had it tuned up by chev dealer. Otherwise it runs great!
Trany is not low on fluid. New Opti-spark. I suspect:
Possible low volume trany pump
Computer needs to be flashed as it forgot the redline

???

 

I would suspect tranny problems long before I would pin this problem on anything to do with the engine.

The tranny SHOULD shift where the factory sets it to shift regardless of whether the engine is making more, less or the same power as stock up there.

 

Check your throttle cable and T.V. cable adjustments. If they're off, it could be the cause of your problem. Bear in mind that on your vehicle there is 3 seperate controllers. One for the emissions, one for the ignition and one for the trans. A fault in any of the three systems could cause a problem in one of the others. If the cables are adjusted properly and the computer isn't throwing any codes your way, your problem will definately reside with the trans.

 

1995? You DO realize that it is a FourthGen, not a ThirdGen, right? There is no TV cable, since the trans is controlled by the PCM. You may have a failing solenoid, poor PCM/Trans connection, low line pressure leaking seals, rings on the clutch packs or valve body, or worn friction surfaces,

Are there any error codes? Usually a DTC will be set if there is a slippage problem or solenoid problem. Oh, never mind, this is THIRD-GEN.org, not 4th Gen.

 

It might not be called a T.V. cable, but there are two cables connected to my throttle body on my 94. One of which is adjustable. That was the one I was referring to.

 

Not sure when GM went to direct computer control of the transmission in the F-body, eliminating the old tried-and-true TV cable, but something tells me it was right around the timeframe we're talking about.

 

Alldata shows a 95 Z28 as still having a TV cable. I dont know for sure as I haven't seen a 95 Z with an auto.

 

That's strange. I thought the 4L60Es all had the PWM solenoid valve for controlling line pressure in the trans. My '94 does, as does the '96, and the '00.... I guess the F-cars got a different transmission.

 

I agree. I'm pretty positive F cars went to the 4L60E in 94. I'm going to see what I can find out today. I'm curious now.

 

'93 was the only year for TV cables (and the associated 4L60, previously known as the 700R4). Everyone who has done an LT1 intake conversion can very much remind us all of that fact (due to hard-to-find nature of '93 LT1 throttle bodies and cable brackets).

 

I apprciate the repsoneses. I have a trany appt next week. Initial view was burnt fluid.

I'm a carb type of person from v-8 vega's to the exisiting LS5 sitting in my garage. These computer things reallly scare me, even though I have an EE degree.

I really like the handlling and thought placed into the 95 Z28's. What a fun car!

 

Burnt fluid usually means fried clutches. I hope it isn't anything that serious. I'll cross my fingers for you; take care.

 

Yes it is likely you have burned up the trans, I had to replace the trans in a 92 RS with a LT1/4L60E that had the same problem, poor 60E got beat up by the LT1.

Anyone saying their 94 or newer F body has a T.V. cable should put down the crack pipe and slowly back away.

Vader you arent imagining things, they ALL have the 60E, unless someone went through the effort to take a step backwards in technology.
And hey no "4th gen only go away" stuff his setup may be in a 4th gen, but the replies he gets may help someone here who has an LT1 in their thirdgen at a later date.

 

It has the PWM solenoid. They switched to using PCMs after '93.