Speed versus RPM's With 456 gears

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

oneluckypops

Full Access Member
Joined
Feb 6, 2011
Posts
2,210
Reaction score
90
Location
Sedalia, Mo.
First Name
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

attachment.php

attachment.php

attachment.php

attachment.php

attachment.php
 

Attachments

  • 45mph 3RD.jpg
    45mph 3RD.jpg
    86.5 KB · Views: 173
  • 45mph OD.jpg
    45mph OD.jpg
    84.8 KB · Views: 162
  • 50mph 3RD.jpg
    50mph 3RD.jpg
    87.5 KB · Views: 170
  • 50mph OD.jpg
    50mph OD.jpg
    85.3 KB · Views: 162
  • 55mph 3RD.jpg
    55mph 3RD.jpg
    87 KB · Views: 155
Last edited:

bucket

Super Moderator
Staff member
Super Moderator
Joined
Aug 3, 2010
Posts
29,217
Reaction score
24,362
Location
Usually not in Ohio
First Name
Andy
Truck Year
'77, '78, '79, '84, '88
Truck Model
K5 thru K30
Engine Size
350-454
I'd show mine, but I don't have a tach, nor a working speedo:crazy:
 

crazy4offroad

Equal Opportunity Destroyer
Joined
Jul 30, 2010
Posts
8,468
Reaction score
1,070
Location
West BY-GOD Virginia
First Name
Curt
Truck Year
1979
Truck Model
K-10
Engine Size
350/SM465/NP205
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
Reaction score
90
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.

attachment.php

attachment.php

attachment.php

attachment.php

attachment.php
 

Attachments

  • 55mph OD.jpg
    55mph OD.jpg
    86.4 KB · Views: 170
  • 60mph 3RD.jpg
    60mph 3RD.jpg
    85.5 KB · Views: 178
  • 60mph OD.jpg
    60mph OD.jpg
    88 KB · Views: 191
  • 65mph 3RD.jpg
    65mph 3RD.jpg
    89.9 KB · Views: 172
  • 65mph OD.jpg
    65mph OD.jpg
    89.1 KB · Views: 160
Last edited:

Latest posts

Forum statistics

Threads
42,344
Posts
914,046
Members
33,846
Latest member
JOD26
Top