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 1988 - 1998 GMT400 Chevy & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 07-12-2019, 10:34 PM   #1
ford35lh
Registered User
 
Join Date: Oct 2015
Location: Upstate, the real New York
Posts: 5
8 lug rear end

Are the 3/4 and 1 ton(single tire) 8 lug rear axles the same ???

Do they vary from 2 wheel drive to 4 wheel drive ???
ford35lh is offline   Reply With Quote
Old 07-12-2019, 10:38 PM   #2
95 S_Trucker
Senior Member
 
95 S_Trucker's Avatar
 
Join Date: Oct 2009
Location: Lancaster, PA
Posts: 2,261
Re: 8 lug rear end

On the 3/4 ton, some were semi float and some were full float. The big block trucks and the crew cabs got full floats

All of the 1 ton trucks had the full float.
__________________
-99 K2500 LS CCSB 7.4
-11 GMC 2500HD SLE CCSB 6.0
-96 C3500 HD 7.4 NV4500 Rollback
-85 K10 5.7 700r4
-78 K10 5.7 4 Speed
-90 ZR1 5.7 6 Speed
-62 Lincoln Sedan 430 Auto
-61 Lincoln Convertable 430 Auto


85 Project: http://67-72chevytrucks.com/vboard/s...d.php?t=368864

78 Big10 Project: http://67-72chevytrucks.com/vboard/s...d.php?t=383629

96 Project: http://67-72chevytrucks.com/vboard/s...d.php?t=614515
95 S_Trucker is offline   Reply With Quote
Old 07-13-2019, 01:32 PM   #3
Bimus
Registered User
 
Join Date: Dec 2018
Location: Farmington NM
Posts: 22
Re: 8 lug rear end

3/4 tons and one tons have different brake setup the one ton has wider shoes so the backing plates have a dish shape and the 3/4 ton are more flat
Attached Images
  
Bimus is offline   Reply With Quote
Old 07-13-2019, 10:52 PM   #4
special-K
Special Order
 
special-K's Avatar
 
Join Date: Nov 2004
Location: Mt.Airy,MD
Posts: 69,805
Re: 8 lug rear end

Diesel 3/4t also got the full-floater. I know the 5spd ones did.
__________________
"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC

'67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi..........'The 67' (project)
'72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok...'The 72' (rolling)
Tim

"Don't call me a redneck. I'm a rough cut country gentleman"

R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586
special-K is offline   Reply With Quote
Old 07-13-2019, 11:58 PM   #5
KQQL IT
At the body shop.
 
KQQL IT's Avatar
 
Join Date: Aug 2009
Location: California for now...
Posts: 4,081
Re: 8 lug rear end

The 454 8600 gvw crew cab did too
__________________
" That didnt make it any newer "
" Dont antique the equipment "
KQQL IT is offline   Reply With Quote
Old 07-14-2019, 10:46 PM   #6
v30crewcab
Registered User
 
v30crewcab's Avatar
 
Join Date: Apr 2012
Location: Chatt Tn
Posts: 640
Re: 8 lug rear end

my 84 diesel 3/4 had a semi-float. it was a 4 speed. no such thing as a 5 speed in a square unless it was bigger than a ton.
__________________
88 military v30 crewcab shortbed
5.9 cummins, nv4500, 205
http://67-72chevytrucks.com/vboard/s...d.php?t=522535
v30crewcab is offline   Reply With Quote
Old 07-15-2019, 01:13 AM   #7
ford35lh
Registered User
 
Join Date: Oct 2015
Location: Upstate, the real New York
Posts: 5
Re: 8 lug rear end

Are the gas 3/4 ton 2wd and 4wd 8 lug (semi) rear ends the same ???

Last edited by ford35lh; 07-15-2019 at 01:18 AM.
ford35lh is offline   Reply With Quote
Old 07-18-2019, 06:57 PM   #8
SCOTI
Registered User
 
SCOTI's Avatar
 
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 18,018
Re: 8 lug rear end

Quote:
Originally Posted by 95 S_Trucker View Post
On the 3/4 ton, some were semi float and some were full float. The big block trucks and the crew cabs got full floats

All of the 1 ton trucks had the full float.
My '99 3/4 ton SWB crew-cab has a 5.7/4l80e combo & has the 9.5"/14bolt SF rear. Maybe the 10.5/14bolt FF was a standard BBC thing & optional for SBC's?
__________________
67SWB-B.B.RetroRod
64SWB-Recycle
89CCDually-Driver/Tow Truck
99CCSWB Driver
All Fleetsides

Building a small, high rpm engine
with the perfect bore, stroke and rod ratio is very impressive...
like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar.

Cubic inches is like Indiana Jones with a cheap pistol....
SCOTI is online now   Reply With Quote
Old 07-26-2019, 11:40 PM   #9
special-K
Special Order
 
special-K's Avatar
 
Join Date: Nov 2004
Location: Mt.Airy,MD
Posts: 69,805
Re: 8 lug rear end

Quote:
Originally Posted by v30crewcab View Post
my 84 diesel 3/4 had a semi-float. it was a 4 speed. no such thing as a 5 speed in a square unless it was bigger than a ton.
Don't go confusing things up. This is the 88-98 forum, so no need to talk about apples when the topic is oranges. And the 5spds in MD trucks, which is yet another topic, were not O/D or anything close to what came in LD trucks of any year
__________________
"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC

'67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi..........'The 67' (project)
'72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok...'The 72' (rolling)
Tim

"Don't call me a redneck. I'm a rough cut country gentleman"

R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586
special-K is offline   Reply With Quote
Old 07-31-2019, 09:06 PM   #10
hatzie
Senior Member
 
hatzie's Avatar
 
Join Date: Oct 2008
Location: Wentworth, NH
Posts: 3,598
Re: 8 lug rear end

Quote:
Originally Posted by Bimus View Post
3/4 tons and one tons have different brake setup the one ton has wider shoes so the backing plates have a dish shape and the 3/4 ton are more flat
Depends on the GVWR and brake options more than whether it's a 2500 or 3500 chassis.

High GVWR 3/4 and SRW 1 ton can have the same size brakes.

JB5 = Vacuum booster
JD5 = Hydroboost
JB6 = Vacuum booster
JD6 = Hydroboost
JB7 = Vacuum booster
JD7 = Hydroboost
JB8 (single wheel) = Hydroboost
JB8 (dual wheel) = Hydroboost
JF9 = Hydroboost

xx6 uses 11.15 x 2.75 Duo-Servo drums

xx7 and xx8 use 12.5 x 1.26 rotors... except JB8 with dual rear wheels that has 12.5 x 1.5 rotors.

xx7 has 13 x 2.5 rear drums
xx8 has 13 x 3.5 rear drums

JF9 has 13.86 x 1.435 front rotors and 13.58 x 1.435 rear rotors
__________________
1959 M35A2 LDT465-1D SOLD
1967 Dodge W200 B383, NP420/NP201 SOLD
1969 Dodge Polara 500 B383, A833 SOLD
1972 Ford F250 FE390, NP435/NP205 SOLD
1976 Chevy K20, 6.5L, NV4500/NP208 SOLD
1986 M1008 CUCV SOLD
2000 GMC C2500, TD6.5L, NV4500
2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263
2009 Impala SS LS4 V8


RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...Please include at least the year and model in your threads. It'll be easier to answer your questions.
And please let us know if and how your repairs were successful.
hatzie 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 01:53 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
Copyright 1997-2013 67-72chevytrucks.com