2800 RPM @ 60mph in 4th?
05-21-2006, 03:56 PM
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2800 RPM @ 60mph in 4th?
I'm blowing the dust off my 1990 Iroc (305 tpi/700r4) and working on some of the gremlins that have creeped in after having it sit for 4 years. One of my latest issues is the 700r4. At 60 mph in 4th gear I am turning 2800 RPM's!? I have a stock 2.73 rear end. My first thought was that I was stuck in 3rd...moved the gear selector from OD to D and sure enough it downshifted to 3rd. Then I thought my torgue converter wasn't locking up so I grounded the A & F terminals on the aldl......same result 60mph = 2800 rpm? I could feel a difference in the shift from 2-3-4 with the aldl grounded so I know it was forcing the TC to lock.....anyone have any ideas why I'm turning so many RPMS a 60 mph? Tranny was rebuilt and worked fine right before I parked it 4 years ago. Fluid level is fine.
05-21-2006, 04:30 PM
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Car: 1991 Z28
Engine: 305 TPI
Transmission: WC T5
Axle/Gears: 3.73 Posi
Does it sound like you are turning 2800 rpms? Some tachometers are known to read high as they get old.
05-26-2006, 06:18 PM
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Well....looks like I've got the dreaded 90-92 high winding tach problem......tach reads way high. Has anyone found a fix for this or swapped in the guts of an aftermarket tach behind the stock guage face?
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