need new rearend + - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Trucks · 03-02-2004, 02:29 PM

New member here

Hello, I have a 68 GMC 3/4 ton 4x4 that has 4.56 gears, tooo low and also the rear end is damaged and needs replaced. I am looking for a set for front and back of something in the 3.08 range for gears. I hope to find some bolt on parts such as a whole tube from tire to tire, but what ya got? 1/2 ton ok, will trade my parts as well.

Located in MN - 55312 Thanks!

Trucks · 03-02-2004, 10:00 PM

anyone got advice? heres more questions...How high would I want to rev a 250 I6 at freeway speeds for hours, 3200 ok? How about a 350cu in, 3200 ok?

whitesswj · 03-02-2004, 10:43 PM

i know that my 250 does fine at 3200. and i might have a rear end but it isn't posi and i want to think that it is 3.73. No sure. but i know it's 3.something. sswj

Trucks · 03-02-2004, 10:51 PM

I6 is whats in it, if i can do 65 mph at 3200rpm maybe I'll be ok with 4.56's. I got my stats from the site

http://richmondgear.com/streetcalculators.html

whitesswj · 03-02-2004, 11:05 PM

thats what i have in mine a 250 I6 4.56 rear 3 in the tree. i think i'm fine. but it does suck the gas. i can do about 75 at 3400.

67-72williso · 03-02-2004, 11:43 PM

Trucks, if you want to go to a 3.07 rear you will have to use a Dana 61 rear. Later Willis

67-72williso · 03-02-2004, 11:49 PM

Trucks, if you want to go to a 3.07 rear you will have to use a Dana 61 rear. Later Willis

whitesswj · 03-02-2004, 11:50 PM

willis i suppose you're saying that the 4.56 is a 3/4 ton?

67-72williso · 03-03-2004, 12:27 AM

Yes I beleive that is what trucks is talking about. Read the original post. Later Willis

Trucks · 03-03-2004, 01:37 PM

ya its 3/4 ton, does that matter?
what about a 350, should they run @ 3200 on a freeway?

looking at keeping my front and getting another 4.56 from a yard then. What kind of milage did you get with your I6? 13mpg? 10?

I have a 350 in a 2wd that gets 15 average but it might be 4.11 gears.

SWEET7T · 03-03-2004, 01:45 PM

Trucks... I'm a little speed demon

and I turn my 327 at 3000 for hours when traveling. I have 3.08's and that puts me at ~80-83mph (th350 tranny). I will get ~12mpg at this speed. I don't see a problem at all for turning a 350 at 3200, and don't see one if your spinning the 6 at the same speed... WIND IT UP!

67-72williso · 03-03-2004, 11:22 PM

Trucks,4.56 ain`t very good highway gears. A 3.07 Dana 61 would be much better. The Dana 44 front would only need a gear change. Work involved but worth it. I`m running a Dana 61 with 3.07 and locker in my 70 C-20. Later Willis

03-02-2004, 02:29 PM	#1
Trucks Is that a Chevy 69...? Join Date: Feb 2004 Location: Brownton MN Posts: 112	need new rearend + New member here Hello, I have a 68 GMC 3/4 ton 4x4 that has 4.56 gears, tooo low and also the rear end is damaged and needs replaced. I am looking for a set for front and back of something in the 3.08 range for gears. I hope to find some bolt on parts such as a whole tube from tire to tire, but what ya got? 1/2 ton ok, will trade my parts as well. Located in MN - 55312 Thanks! __________________ Ahhhh, the wonderful sound of a rumbling V8.

03-02-2004, 10:00 PM	#2
Trucks Is that a Chevy 69...? Join Date: Feb 2004 Location: Brownton MN Posts: 112	help anyone got advice? heres more questions...How high would I want to rev a 250 I6 at freeway speeds for hours, 3200 ok? How about a 350cu in, 3200 ok? __________________ Ahhhh, the wonderful sound of a rumbling V8.

03-02-2004, 10:43 PM	#3
whitesswj Embrace the Redneck Join Date: Jan 2004 Location: Cabot, AR Posts: 1,334	i know that my 250 does fine at 3200. and i might have a rear end but it isn't posi and i want to think that it is 3.73. No sure. but i know it's 3.something. sswj __________________ '01 Camaro *Son, you just can't get there from here...*

03-02-2004, 10:51 PM	#4
Trucks Is that a Chevy 69...? Join Date: Feb 2004 Location: Brownton MN Posts: 112	well I6 is whats in it, if i can do 65 mph at 3200rpm maybe I'll be ok with 4.56's. I got my stats from the site http://richmondgear.com/streetcalculators.html __________________ Ahhhh, the wonderful sound of a rumbling V8.

03-02-2004, 11:05 PM	#5
whitesswj Embrace the Redneck Join Date: Jan 2004 Location: Cabot, AR Posts: 1,334	thats what i have in mine a 250 I6 4.56 rear 3 in the tree. i think i'm fine. but it does suck the gas. i can do about 75 at 3400. __________________ '01 Camaro *Son, you just can't get there from here...*

03-02-2004, 11:43 PM	#6
67-72williso Junk/Daily Driver Club Join Date: Feb 2004 Location: Manheim, PA 17545 Posts: 253	3/4 ton rear Trucks, if you want to go to a 3.07 rear you will have to use a Dana 61 rear. Later Willis

03-02-2004, 11:49 PM	#7
67-72williso Junk/Daily Driver Club Join Date: Feb 2004 Location: Manheim, PA 17545 Posts: 253	3/4 ton rear Trucks, if you want to go to a 3.07 rear you will have to use a Dana 61 rear. Later Willis

03-02-2004, 11:50 PM	#8
whitesswj Embrace the Redneck Join Date: Jan 2004 Location: Cabot, AR Posts: 1,334	willis i suppose you're saying that the 4.56 is a 3/4 ton? __________________ '01 Camaro *Son, you just can't get there from here...*

03-03-2004, 12:27 AM	#9
67-72williso Junk/Daily Driver Club Join Date: Feb 2004 Location: Manheim, PA 17545 Posts: 253	3/4 ton rear Yes I beleive that is what trucks is talking about. Read the original post. Later Willis

03-03-2004, 01:37 PM	#10
Trucks Is that a Chevy 69...? Join Date: Feb 2004 Location: Brownton MN Posts: 112	yep ya its 3/4 ton, does that matter? what about a 350, should they run @ 3200 on a freeway? looking at keeping my front and getting another 4.56 from a yard then. What kind of milage did you get with your I6? 13mpg? 10? I have a 350 in a 2wd that gets 15 average but it might be 4.11 gears. __________________ Ahhhh, the wonderful sound of a rumbling V8.

03-03-2004, 01:45 PM	#11
SWEET7T Try spinnin 4 rear tars Join Date: Sep 2003 Location: Salt Lake City, Utah Posts: 757	Trucks... I'm a little speed demon and I turn my 327 at 3000 for hours when traveling. I have 3.08's and that puts me at ~80-83mph (th350 tranny). I will get ~12mpg at this speed. I don't see a problem at all for turning a 350 at 3200, and don't see one if your spinning the 6 at the same speed... WIND IT UP! __________________ SWEET7T 1970 C10, 2wd, LB, 307/TH350/3.08. PS, PB

03-03-2004, 11:22 PM	#12
67-72williso Junk/Daily Driver Club Join Date: Feb 2004 Location: Manheim, PA 17545 Posts: 253	3/4 ton Trucks,4.56 ain`t very good highway gears. A 3.07 Dana 61 would be much better. The Dana 44 front would only need a gear change. Work involved but worth it. I`m running a Dana 61 with 3.07 and locker in my 70 C-20. Later Willis

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