how to check what gears you have.
05-29-2007, 07:57 AM
#1
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how to check what gears you have. I have the GU2 sticker in my door. But I see where it says I should be i should be running 2k rpms @ 80. I am at more like 2500+. Deffinatly not 2000. Could there be a problems with my tranny?
05-29-2007, 08:46 AM
#2
Tire size can affect this if you have four forward gears and lockup then the trans would be fine, To test your actual rear ratio raise wheels and turn your pinion count the exact number of turns to one complete turn of the wheel.
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05-29-2007, 06:55 PM
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Well to be at a higher RPM he would need a smaller tire diameter than stock which I really doubt he has on 18" wheels...are you sure the rear was never modified and aftermarket gears installed by a previous owner?
05-30-2007, 07:18 AM
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Originally Posted by BlackHawk T/A
Well to be at a higher RPM he would need a smaller tire diameter than stock which I really doubt he has on 18" wheels...are you sure the rear was never modified and aftermarket gears installed by a previous owner?
that is what i am thinking. On my way home yesterday I was doing 80 and my RPM's were at 2700. That is the what rpm's 3.73 should be at correct?? My 18's are 275/35's. Is there any other explanation other than the pervious owner modded the car?
Also when I bought the car it had SLP letters on the driver's side rear end. I took those off since the car had nothing SLP on it. I later put the SLP air box on it. Was there some Z28's that SLP did stuff too. I got the car from a dealer so he didnt know what the pervious owner had done??
05-30-2007, 10:17 AM
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Are you using a scan tool or the factory tach?
in the low RPM's my 98 will read 2200 RPM when its acually turning 1800 on the scantool. but when it winds up to 4000+ the scantool and the factory tach agree on engine speed.
in the low RPM's my 98 will read 2200 RPM when its acually turning 1800 on the scantool. but when it winds up to 4000+ the scantool and the factory tach agree on engine speed.
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05-30-2007, 06:27 PM
#9
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Originally Posted by Ragtop 99
If it does not feel like it is slipping (i.e. the rpms stay pretty constant over a normal range of throttle input when cruising at 80), I'd say the previous owner switched gears.
