Speed versus RPM's With 456 gears

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oneluckypops

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Location
Sedalia, Mo.
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Luke
Truck Year
85
Truck Model
K30 SRW
Engine Size
5.7 Fuel injected Vortec/ 4L80E
Below are pictures of my instrument panel that I took while driving to show just what the Rpms are at certain speeds. For those that dont know the truck is:
1996 Cheverolet K1500
5.7 Engine 305,000 miles
4L80E Transmission 20-30,000 miles
456:1 Front 2 years old
456:1 Rear 2 years old
NP241C Transfer Case 305,000 miles
265 70 17 Tires 15,000 miles

And YES my speedometer is Correct

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  • 45mph OD.jpg
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  • 50mph 3RD.jpg
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  • 55mph 3RD.jpg
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bucket

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K5 thru K30
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350-454
I'd show mine, but I don't have a tach, nor a working speedo:crazy:
 

crazy4offroad

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Some people freak out when their tach goes above 2500 but not me, it spends more time above 4 grand from me givin it hell in a pit! Good pics man, those are tolerable r's.
 

oneluckypops

Full Access Member
Joined
Feb 6, 2011
Posts
2,210
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Location
Sedalia, Mo.
First Name
Luke
Truck Year
85
Truck Model
K30 SRW
Engine Size
5.7 Fuel injected Vortec/ 4L80E
FYI If you are running a 3 SPD Transmission Your 3RD gear RPM'S will be SLIGHTLY lower then mine Roughly 100-200 rpm less Because of Lock up.
My VCM was reflashed for towing and the Converter does NOT lock up in 3RD Gear.

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  • 55mph OD.jpg
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  • 60mph 3RD.jpg
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  • 60mph OD.jpg
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  • 65mph 3RD.jpg
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  • 65mph OD.jpg
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