what year rearend is best? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

10.5stang · 04-23-2007, 04:51 PM

i have a 1969 swb. its a inline 6 and three speed on the tree. i am going to put a big block in it and i was wondering what are my opions on rearend exchange?

Longhorn Man · 04-23-2007, 05:03 PM

whats the plan with the truck... what's it's intended use?

10.5stang · 04-24-2007, 01:02 AM

iam going to drive it alot! the motor is nothing very special. it made 490hp and is a pump gas motor. the trans is a 700r4 that i had built for the motor.
i am not going to drag race it, just want it to hold up. is there a rear end that is easy to find and replace the stock unit? thanks again for the help! matt

lbpd719 · 04-24-2007, 01:11 AM

you might want to ask for advice from the person who built your transmission for you, or your engine builder..

I do however like the dana third members, if your doing a swap, you can get it rebuilt at the same time and have it geared however you want..

GREASEMONKEY72 · 04-24-2007, 01:14 AM

put a ford 9in in it, strong and plenty of gear options

GREASEMONKEY72 · 04-24-2007, 01:18 AM

forgot to mention that it doesnt just bolt in, you do have to modify it a bit but i think its just the spring mounts

Tx Firefighter · 04-24-2007, 07:38 AM

The stock rearend is mighty strong. You'll be hard pressed to hook up hard enough to break it.

msgross · 04-24-2007, 08:13 AM

Quote:

Originally Posted by Tx Firefighter

The stock rearend is mighty strong. You'll be hard pressed to hook up hard enough to break it.

you could always replace the axle shafts and carrier with stronger units and not have any issues. You should have a chevy 12-bolt...

Longhorn Man · 04-24-2007, 05:02 PM

Even if it's built up, I'd say the tranny is the weak link.

mnunn454 · 04-24-2007, 06:58 PM

Chevy truck 12 bolt with a 3.42 posi or a 3.73 posi will serve your needs quite well, and for a long time. With the TH700's overdrive, I wouldn't go numerically lower than 3.42 and for the power and useage you've got in mind, a 12 bolt will be fine. A Ford 9-inch would be superior, but besides being a F#$%, it's overkill for your situation.

My Elky's BBC/TH700/3.55 combo turns about 2200 RPM at 60MPH and 2400 at 70 as I recall.

04-23-2007, 04:51 PM	#1
10.5stang Registered User Join Date: Jan 2007 Location: Goldsby,OK Posts: 324	what year rearend is best? i have a 1969 swb. its a inline 6 and three speed on the tree. i am going to put a big block in it and i was wondering what are my opions on rearend exchange? Last edited by 10.5stang; 04-23-2007 at 04:52 PM.

04-23-2007, 05:03 PM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: what year rearend is best? whats the plan with the truck... what's it's intended use?

04-24-2007, 01:02 AM	#3
10.5stang Registered User Join Date: Jan 2007 Location: Goldsby,OK Posts: 324	Re: what year rearend is best? iam going to drive it alot! the motor is nothing very special. it made 490hp and is a pump gas motor. the trans is a 700r4 that i had built for the motor. i am not going to drag race it, just want it to hold up. is there a rear end that is easy to find and replace the stock unit? thanks again for the help! matt

04-24-2007, 01:11 AM	#4
lbpd719 Zappaphile! Join Date: Apr 2007 Location: Los Banos, California Posts: 228	Re: what year rearend is best? you might want to ask for advice from the person who built your transmission for you, or your engine builder.. I do however like the dana third members, if your doing a swap, you can get it rebuilt at the same time and have it geared however you want.. __________________ 1969 C20 LWB Camper Special - The Beater.. 1998 Cheyenne V6 - 4/6 Drop - For The Son

04-24-2007, 01:14 AM	#5
GREASEMONKEY72 Registered User Join Date: Aug 2006 Location: Bakersfield,CA Posts: 7,893	Re: what year rearend is best? put a ford 9in in it, strong and plenty of gear options __________________ -steven Alte Seele S.S. "Allison" '72 C/10 LWB 350SB/TH350 - DD PITBULL IS NOT A CRIME

04-24-2007, 01:18 AM	#6
GREASEMONKEY72 Registered User Join Date: Aug 2006 Location: Bakersfield,CA Posts: 7,893	Re: what year rearend is best? forgot to mention that it doesnt just bolt in, you do have to modify it a bit but i think its just the spring mounts __________________ -steven Alte Seele S.S. "Allison" '72 C/10 LWB 350SB/TH350 - DD PITBULL IS NOT A CRIME Last edited by GREASEMONKEY72; 04-24-2007 at 01:18 AM.

04-24-2007, 07:38 AM	#7
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: what year rearend is best? The stock rearend is mighty strong. You'll be hard pressed to hook up hard enough to break it. __________________ I'm on the Instagram- @Gearhead_Kevin

04-24-2007, 05:02 PM	#9
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: what year rearend is best? Even if it's built up, I'd say the tranny is the weak link.

04-24-2007, 06:58 PM	#10
mnunn454 Registered User Join Date: Dec 2006 Location: Rhode Island Posts: 602	Re: what year rearend is best? Chevy truck 12 bolt with a 3.42 posi or a 3.73 posi will serve your needs quite well, and for a long time. With the TH700's overdrive, I wouldn't go numerically lower than 3.42 and for the power and useage you've got in mind, a 12 bolt will be fine. A Ford 9-inch would be superior, but besides being a F#$%, it's overkill for your situation. My Elky's BBC/TH700/3.55 combo turns about 2200 RPM at 60MPH and 2400 at 70 as I recall. __________________ 69 C-10 SWB Fleetside 454/TH400 (For Sale) http://67-72chevytrucks.com/vboard/c...ct=1299&cat=12 70 El Camino 454 TH700 29 Model A 4-DR Sedan Deluxe

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