The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 01-28-2012, 03:12 PM   #1
JCampbell
Account Suspended
 
Join Date: Apr 2008
Location: Hesperia, Ca
Posts: 1,332
Best Gear Ratio for Overdrive Trans

Just kicking around some ideas...

I'm swapping in TBI 454 into my '77 dually and now I'm seriously considering swapping over to a 4L80E trans. I'm curious what the consensus would be regarding the optimal gear ratio for that particular setup.

It's a Dana 70 HD rear end. I'm assuming it's got 4.11's in it now, although I never bothered to check. Tire size is 225/75/16.

Any thoughts?
JCampbell is offline   Reply With Quote
Old 01-28-2012, 03:21 PM   #2
gmech
Registered User
 
Join Date: Feb 2011
Location: Lake, Michigan
Posts: 219
Re: Best Gear Ratio for Overdrive Trans

I went on Randys Ring And Pinion 55mph= 1833rpm
65mph= 2167rpm
75mph= 2500rpm
gmech is offline   Reply With Quote
Old 01-28-2012, 07:37 PM   #3
Tom
driving is in my blood
 
Tom's Avatar
 
Join Date: Dec 1999
Location: Mesa AZ
Posts: 5,748
Re: Best Gear Ratio for Overdrive Trans

Best gear ratio for what? Towing, fuel mileage, acceleration?
__________________
-78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle.
-98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes.
-02 Suburban 4x4: leveled front
-CBR600F4i, CBR600RR, CBR1000RR, and standup skis
DISCLAIMER: I cant spell for the life of me.
Tom is offline   Reply With Quote
Old 01-28-2012, 11:28 PM   #4
JCampbell
Account Suspended
 
Join Date: Apr 2008
Location: Hesperia, Ca
Posts: 1,332
Re: Best Gear Ratio for Overdrive Trans

General purpose.
JCampbell is offline   Reply With Quote
Old 01-29-2012, 01:12 AM   #5
K 20 blazer
Registered User
 
Join Date: Nov 2011
Location: florida
Posts: 12
Re: Best Gear Ratio for Overdrive Trans

I like 3:73. But that's just me.

T
K 20 blazer is offline   Reply With Quote
Old 01-29-2012, 01:32 AM   #6
Corts60
Just here to tinker
 
Corts60's Avatar
 
Join Date: Jun 2008
Location: Holland, MI
Posts: 3,697
Re: Best Gear Ratio for Overdrive Trans

I also like 3:73's. They work great for towing but don't make the engine scream down the highway like 4:11's.
Corts60 is offline   Reply With Quote
Old 01-29-2012, 02:17 AM   #7
hick
Registered User
 
Join Date: Nov 2009
Location: Edmonton Alberta
Posts: 286
Re: Best Gear Ratio for Overdrive Trans

I have 4.10's now with a 454...

Don't plan on doing much highway travel, and if you do make damn sure you know where your next fuel station is... you won't be passing many

I personally am going to re-gear it because although i tow on a regular basis 4.10's are just not needed.

How ever i only have a Turbo 400... I can't comment on it if you got that extra gear in there. I think it would certainly be tolerable
__________________
1989 3+3 2wd Dually. 454 BB. Factory loaded for the day, including Alcoa rims.
hick is offline   Reply With Quote
Reply

Bookmarks


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 11:46 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com