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 1967 - 1972 Chevrolet & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 01-21-2009, 06:22 PM   #1
ole school
Registered User
 
ole school's Avatar
 
Join Date: Jun 2005
Location: chapmansboro tn
Posts: 29
Tranny question on a 1 ton dually

I have a 68 1 ton dually im wanting to use as a hauler for my show truck. it doesnt do well on the interstate because of either the rear end ratio. or the tranny. most call the tranny a granny 4 speed. im looking for an idea to keep it a hauler but make it better on the interstate. i really dont want an automatic. Thanks for any help..
__________________
IT'S HARD TO MAKE CHICKEN SALAD WHEN YOUR USING CHICKEN S.........

1968 crew cab build (under construction)
ole school is offline   Reply With Quote
Old 01-21-2009, 06:39 PM   #2
Yukon Jack
Post Whore
 
Yukon Jack's Avatar
 
Join Date: Feb 2000
Location: Rose Hill, KS, USA
Posts: 12,686
Re: Tranny question on a 1 ton dually

Gear Vendors has an add on overdrive that might be good, your other options would be to regear or go with a newer overdrive tranny.

Regearing would be cheapest but you'd have to be careful to still have enough gear to get going and handle hills. If money isn't a big issue, the Gear Vendor would be a great option.
__________________
1970 Blazer with a 400 sbc and 4" lift
1980 Pontiac Trans Am, 455 Oldsmobile
2012 Kawasaki Concours 14
Yukon Jack is offline   Reply With Quote
Old 01-21-2009, 08:12 PM   #3
Longhorn Man
its all about the +6 inches
 
Longhorn Man's Avatar
 
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,690
Re: Tranny question on a 1 ton dually

you should have the eaton HO72 in that, id if it is all original, the 5.13 gear came with the daul rear wheel option.
You can locate a 4.10 gear in just about any 3/4 ton or one ton single rear wheel that has a small block and an automatic (unless otherwise optioned). That's prpobably the best gear you'll ever locate for that rear end.
This would cut your RPMs down quite a bit, but they'll still be 'up there' a bit.
The swap is easy, and no special tools at all. You just drop the whole center section out (from the front of the axle) after pulling the drive shaft, and the axle shafts.
Be carefull... it is about a hundred pounds.
However, you'd be better off locating a whole rear end out of a later truck. The drums for your set up were discontinued about 20 years ago, and getting replacements means junk yard trips.

Last edited by Longhorn Man; 01-21-2009 at 08:15 PM.
Longhorn Man is offline   Reply With Quote
Old 01-21-2009, 08:43 PM   #4
72truckman
Registered User
 
72truckman's Avatar
 
Join Date: Mar 2006
Location: San Ramon, California
Posts: 276
Re: Tranny question on a 1 ton dually

Early NV4500's out of 1992- 1995 C/K2500's and 3500's have a 6.34 granny first and a .75 overdrive
__________________
My 1972 Blazer 5.3 E85/ NV4500 5spd 4x4
Work in Progress
http://67-72chevytrucks.com/vboard/s...d.php?t=291482

****SOLD!!!!!**** 1965 GMC 4X4
http://67-72chevytrucks.com/vboard/s...d.php?t=294727
72truckman is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

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 12:11 PM.


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