Author Topic: 3:73 Gears ok street and strip ?  (Read 2956 times)

Offline Bigrig

  • Newbie
  • Posts: 4
  • Newbie
3:73 Gears ok street and strip ?
« on: July 20, 2017, 10:39:44 PM »
Building 86 chevy 2wd longbed with an Fully built Olds 455 roller rocker, aluminum heads, aluminum intake, long tube headers , holly demon 750 cfm carb and a Turbo 400 stage 3 shift kit and 3000 stall.  stock 15" wheels .  3:73 gears .  The truck is not put together yet and I am wondering if the 3:73 are going to be ok for short road trips and freeway driving without wrapping up the RPM's too high ?  Anyone else have a similar set up or advice
Long Bed low and fast

Offline Rattler12

  • Registered Users
  • *
  • Posts: 219
  • Old Geezer
Re: 3:73 Gears ok street and strip ?
« Reply #1 on: July 21, 2017, 08:13:25 AM »
I've got 3:73's in my 83 but they're behind a NV 4500 5 spd manual trans with .73 OD. The combo works out well. With the 400 and it's 1:1 final ratio you're going to be 33% higher in the rev range at hwy speeds with street tires. While my 454 is cruising at around 1950 rpm your 455 will be at 2650 or so. You'll need deeper wallet and a bigger gas tank.......:)
83 C-10 shorty 454, 5spd, 3:73 posi

Offline Irish_Alley

  • Tim
  • Global Moderator
  • Senior Member
  • *****
  • Posts: 13319
  • Family is not an important thing. It's everything.
Re: 3:73 Gears ok street and strip ?
« Reply #2 on: July 26, 2017, 08:29:37 AM »
rattler, not to hijack or anything but whats your MPGs?

If you canít tell yourself the truth, who can you tell it to?~Irish_Alley

When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes

Offline SkinnyG

  • Registered Users
  • *
  • Posts: 198
  • Reducing resale value since 8-track days
Re: 3:73 Gears ok street and strip ?
« Reply #3 on: July 26, 2017, 10:49:29 AM »
I went from 3.07 to 3.73 on my daily-driver C10, and I'm running about 3000rpm at 60mph or so.  I noticed a teeny improvement in fuel economy and my guess is because 1) the cam is at a happier rpm and 2) I'm now cruising above the torque converter's stall speed.
The Crusty Chevy: 1977 Silverado, shortboxed & dropped, potato-potato.

Offline Rattler12

  • Registered Users
  • *
  • Posts: 219
  • Old Geezer
Re: 3:73 Gears ok street and strip ?
« Reply #4 on: July 26, 2017, 12:53:45 PM »
rattler, not to hijack or anything but whats your MPGs?
10 mpg no matter what..... :'(
83 C-10 shorty 454, 5spd, 3:73 posi

Offline Irish_Alley

  • Tim
  • Global Moderator
  • Senior Member
  • *****
  • Posts: 13319
  • Family is not an important thing. It's everything.
Re: 3:73 Gears ok street and strip ?
« Reply #5 on: July 26, 2017, 12:59:33 PM »
is that before the nv4500?
If you canít tell yourself the truth, who can you tell it to?~Irish_Alley

When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes

Offline Rattler12

  • Registered Users
  • *
  • Posts: 219
  • Old Geezer
Re: 3:73 Gears ok street and strip ?
« Reply #6 on: July 26, 2017, 09:14:50 PM »
is that before the nv4500?
After......but it runs like a scalded dog......so there's that
« Last Edit: July 26, 2017, 09:20:35 PM by Rattler12 »
83 C-10 shorty 454, 5spd, 3:73 posi

Offline Irish_Alley

  • Tim
  • Global Moderator
  • Senior Member
  • *****
  • Posts: 13319
  • Family is not an important thing. It's everything.
Re: 3:73 Gears ok street and strip ?
« Reply #7 on: July 26, 2017, 10:05:38 PM »
I know my 91 v3500 crew cab with a 350 got 12 with the 4l80e and 4.10  Now she can get 16 with the Cummins  ;)
If you canít tell yourself the truth, who can you tell it to?~Irish_Alley

When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes