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| C4 General Discussion For general topics of discussion related to the 1984 - 1996 Corvette. |
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10-29-07, 05:29 PM
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#1 (permalink)
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Supporting Member
Join Date: Mar 2003
Location: MS Gulf Coast
Posts: 4,314
My Corvette(s):
2000 Coupe 6 speed & 1996 Coupe Automatic
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1990 - automatic trans. question
What RPM should we be looking at while at Interstate cruising speeds of say 70 mph on a 1990, A4.
Believe Joe is on his return trip from Jacksonville, FL and reports nearly 4,000 rpm to maintain around 70 mph.
Sounds like he needs a transmission service -
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UPDATED: MORE SONGS FROM OUR CD
Endorsing Artist with CA Guitars -
2000 Corvette Coupe---Black on Black---6 speed
19/20 HRE 547, RK Sport Hood, Vararam, PIAA Headlights, C6/Z06 shifter, Borla Exhaust, Rocker Rails, Frame Savers, Flush Tail Lights, Both Tops, Lowered,
1996 Corvette Coupe---Bright Aqua Metallic---Automatic
17/18 Chrome "wagon wheels", TB Bypass, Both Tops
63,000 miles
Last edited by Rain; 11-10-07 at 06:06 PM.
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10-29-07, 06:42 PM
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#2 (permalink)
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Supporting Member
Join Date: Feb 2002
Location: out of the area...
Posts: 12,284
My Corvette(s):
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although it might be helpful to know what gear ratio the car has, either way, even with the G92 perf. axle, 4,000 rpm's is too high in 4th. It sounds like it has not chifted out of 3rd.
The TV cable could be out of adjustment, preventing the upshift. Or of course, it could be more serious than that.
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10-29-07, 06:53 PM
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#3 (permalink)
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Supporting Member
Join Date: Mar 2003
Location: MS Gulf Coast
Posts: 4,314
My Corvette(s):
2000 Coupe 6 speed & 1996 Coupe Automatic
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thats pretty much what I told him too -
knew that was too high and that it wasnt shifting on thru the gears for cruising.
Perhaps its never had a filter/fluid change
__________________
UPDATED: MORE SONGS FROM OUR CD
Endorsing Artist with CA Guitars -
2000 Corvette Coupe---Black on Black---6 speed
19/20 HRE 547, RK Sport Hood, Vararam, PIAA Headlights, C6/Z06 shifter, Borla Exhaust, Rocker Rails, Frame Savers, Flush Tail Lights, Both Tops, Lowered,
1996 Corvette Coupe---Bright Aqua Metallic---Automatic
17/18 Chrome "wagon wheels", TB Bypass, Both Tops
63,000 miles
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10-29-07, 06:56 PM
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#4 (permalink)
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Supporting Member
Join Date: Feb 2002
Location: out of the area...
Posts: 12,284
My Corvette(s):
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one school of thought on changing old fluid - the "thickness" of the fluid in some cases, is all that is shifting the transmission. I have seen transmissions "let go" soon after a flush and fill, go figure 
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10-29-07, 08:35 PM
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#5 (permalink)
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Supporting Member
Join Date: Mar 2003
Location: MS Gulf Coast
Posts: 4,314
My Corvette(s):
2000 Coupe 6 speed & 1996 Coupe Automatic
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true true -
When I did my 96 a couple years ago (first change she had ever had), I was nervous to say the least. Didn't think we'd ever get the metal ring out of the hole once we dropped the pan and pulled out the filter.
I hear some shops (that don't know about the metal ring on the filter) will just cram the new filter up in there - so its not unusual to find more than one in there..
__________________
UPDATED: MORE SONGS FROM OUR CD
Endorsing Artist with CA Guitars -
2000 Corvette Coupe---Black on Black---6 speed
19/20 HRE 547, RK Sport Hood, Vararam, PIAA Headlights, C6/Z06 shifter, Borla Exhaust, Rocker Rails, Frame Savers, Flush Tail Lights, Both Tops, Lowered,
1996 Corvette Coupe---Bright Aqua Metallic---Automatic
17/18 Chrome "wagon wheels", TB Bypass, Both Tops
63,000 miles
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11-01-07, 08:48 AM
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#6 (permalink)
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Member
Join Date: Jun 2007
Location: Carolina Beach, NC
Posts: 18
My Corvette(s):
1990 White Coupe
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YIKES!!! I have a completely stock '90 (L98 with a stock auto transmission). At highway speeds, I am only throwing about 2,000 RPM. Sounds like the tranny isn't upshifting into fourth gear and hence overdrive. I would get that bad boy looked at quickly.
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11-02-07, 07:57 AM
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#7 (permalink)
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Technical Advisor
Join Date: May 2001
Location: New Haven, Ct. USA
Posts: 3,235
My Corvette(s):
Nope, but someday.
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HI there,
Before you throw up your hands, check your fluid level.
Then, if after that, you still dont have 4th the 2/4 servo should be checked.
Allthebest, c4c5
__________________
GM World Class Certified Technician, it is not a goal, but a steadfast commitment to excellence in a field more demanding than most. Chevrolet Professional service guild NCM#7993. My greatest asset, my daughter. http://corvettemechanic.com
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11-02-07, 03:27 PM
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#8 (permalink)
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Member
Join Date: Nov 2002
Location: MS Gulf Coast
Posts: 1,119
My Corvette(s):
'90 coupe (gone) '96 CE LT4 Z51
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Is the motor actually spinning at 4K or is the tach just reading 4K. On my old '90 the tach filter was bad and the RPM's were reading higher than the motor was actually spinning. I checked this by putting one of those small 2 1/2" tachs in temporarily. Hook up was easy one wire to each of the battery posts and one wire to the tach output off the distributor.
BTW the tach filter is a discontinued item and there is NO aftermarket replacement, or at least at the time there wasn't.
G
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11-09-07, 09:08 PM
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#9 (permalink)
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Supporting Member
Join Date: Mar 2003
Location: MS Gulf Coast
Posts: 4,314
My Corvette(s):
2000 Coupe 6 speed & 1996 Coupe Automatic
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Thanks for the input guys -
CAC has not been notifying me of replies to this thread.
(sorry for the delayed reply)
Rain
__________________
UPDATED: MORE SONGS FROM OUR CD
Endorsing Artist with CA Guitars -
2000 Corvette Coupe---Black on Black---6 speed
19/20 HRE 547, RK Sport Hood, Vararam, PIAA Headlights, C6/Z06 shifter, Borla Exhaust, Rocker Rails, Frame Savers, Flush Tail Lights, Both Tops, Lowered,
1996 Corvette Coupe---Bright Aqua Metallic---Automatic
17/18 Chrome "wagon wheels", TB Bypass, Both Tops
63,000 miles
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11-09-07, 09:09 PM
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#10 (permalink)
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Supporting Member
Join Date: Mar 2003
Location: MS Gulf Coast
Posts: 4,314
My Corvette(s):
2000 Coupe 6 speed & 1996 Coupe Automatic
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He should chime in and give us a first hand experience.
But it sounds like sometimes the Tach doesnt respond at all sometimes.
Then other times it catches and starts displaying. Ive not had time to see the Vette yet.
__________________
UPDATED: MORE SONGS FROM OUR CD
Endorsing Artist with CA Guitars -
2000 Corvette Coupe---Black on Black---6 speed
19/20 HRE 547, RK Sport Hood, Vararam, PIAA Headlights, C6/Z06 shifter, Borla Exhaust, Rocker Rails, Frame Savers, Flush Tail Lights, Both Tops, Lowered,
1996 Corvette Coupe---Bright Aqua Metallic---Automatic
17/18 Chrome "wagon wheels", TB Bypass, Both Tops
63,000 miles
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11-10-07, 12:27 PM
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#11 (permalink)
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Member
Join Date: Nov 2002
Location: MS Gulf Coast
Posts: 1,119
My Corvette(s):
'90 coupe (gone) '96 CE LT4 Z51
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Sounds like the Tach filter to me. Its located on one of the upper bolts between the engine and transmission, on the drivers side. Its round, about 3/4" in dia, and about 3" long, it has one wire one either side of the canister.
Oh BTW Rain, in your first post you have his car listed as a M4, in '90 there was only the A4 and the six speed.
G
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11-10-07, 06:05 PM
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#12 (permalink)
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Supporting Member
Join Date: Mar 2003
Location: MS Gulf Coast
Posts: 4,314
My Corvette(s):
2000 Coupe 6 speed & 1996 Coupe Automatic
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oops - i;ll see if I can correct it
LOL!
When are you in the Gport area again?
__________________
UPDATED: MORE SONGS FROM OUR CD
Endorsing Artist with CA Guitars -
2000 Corvette Coupe---Black on Black---6 speed
19/20 HRE 547, RK Sport Hood, Vararam, PIAA Headlights, C6/Z06 shifter, Borla Exhaust, Rocker Rails, Frame Savers, Flush Tail Lights, Both Tops, Lowered,
1996 Corvette Coupe---Bright Aqua Metallic---Automatic
17/18 Chrome "wagon wheels", TB Bypass, Both Tops
63,000 miles
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11-10-07, 07:12 PM
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#13 (permalink)
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Member
Join Date: Nov 2002
Location: MS Gulf Coast
Posts: 1,119
My Corvette(s):
'90 coupe (gone) '96 CE LT4 Z51
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Not till Christmas.
See ya around!
G
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