Gearing help ??
05-13-2012, 03:35 PM
#1
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Car: 84 Z-28 / 98 SIERRA Z71
Engine: 350
Transmission: 700R4 / 4L80E
Gearing help ??
Alright, Im looking to redo the posi, while we're in there we thought of updating the gears also. According to my rpo code, its got 3.23 gears. I have a worked 700r4, would like to possibly get lower rpms. Right now cruising at 55-60 its taching 2200 or so.
Would would be my best option? Stay at 3.23 or change it?
Would would be my best option? Stay at 3.23 or change it?
Last edited by rummie; 05-13-2012 at 04:22 PM.
05-13-2012, 04:18 PM
#2
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Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
Re: Gearing help ??
Don't trust the "codes"; before buying anything, TAKE OFF THE COVER AND LOOK AT THE PARTS. There's no way to be sure that whatever came in it, is still there.
Not sure what this means?
What engine is in it? Sounds like it was originally the LG4? On a chasiss dyno, at what RPM does it make peak torque and HP?
would like to possibly get better high rpms
What engine is in it? Sounds like it was originally the LG4? On a chasiss dyno, at what RPM does it make peak torque and HP?
05-13-2012, 04:24 PM
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Car: 84 Z-28 / 98 SIERRA Z71
Engine: 350
Transmission: 700R4 / 4L80E
Re: Gearing help ??
I can trust the code cause we are basically the original owners and we never changed the gears, just a posi unit was put in. engine is a rebuilt 350 and car has never been dynoed.
05-13-2012, 04:27 PM
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Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
Re: Gearing help ??
3.23 is the lowest ratio that will work on a 3 series carrier. You'd have to get a 2 series carrier to use any lower ratio.
2200 @ 60 sounds high for 3.23s; your tach probably reads high, like they usually do. That's how they fail in these cars, is by reading high. Sometimes they'll read as much as 3 times the actual engine RPM before they finally quit working altogether.
2200 @ 60 sounds high for 3.23s; your tach probably reads high, like they usually do. That's how they fail in these cars, is by reading high. Sometimes they'll read as much as 3 times the actual engine RPM before they finally quit working altogether.
05-13-2012, 07:09 PM
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Car: 84 Z-28 / 98 SIERRA Z71
Engine: 350
Transmission: 700R4 / 4L80E
Re: Gearing help ??
Alright, I have a different cluster in in now, and they may be the issue. Ill have to run with it and see.
Hopefully just fixing the posi issue may even help how it feels.
Hopefully just fixing the posi issue may even help how it feels.
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