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Old 10-23-2007, 11:38 AM   #1
83k5blzrbob
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Question 83 chevy 3/4 ton - 8 lug axles

I have a line on a pair of front and rear 3/4 ton axles with 4:10 gears out of a chevy truck. Would these be a direct replacement for the current 1/2 ton axles that came in my 83 blazer?

My blazer originally had a 350 / 700R4 / NP208 / and corporate 10 bolts front and rear with 3:42's. I am looking to run 35" tires once the blazer is completed.

What, if anything, would I need to change to run the 3/4 ton axles?

Last question - any cons to running the heavier axles?

Thanks for the advice,
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Old 10-23-2007, 11:51 AM   #2
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you'll need a conversion rear u-joint and 8 lug wheels. some changes may be necessary for the e-brake.
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Old 10-23-2007, 04:14 PM
Posted in reply to YZEATER's post starting "you'll need a conversion rear u-joint..."
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The e-brake cable change is pre and post '84 I believe, so if your truck is later than 84, then you will probably have to get new brake cables.
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Old 10-23-2007, 05:56 PM
Posted in reply to 3/4 Ton Blazer's post starting "The e-brake cable change is pre and..."
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Quote:
Originally Posted by 3/4 Ton Blazer View Post
The e-brake cable change is pre and post '84 I believe, so if your truck is later than 84, then you will probably have to get new brake cables.
I think it was 81 and up, the dash changed in 84
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1970 Chevy LB 2wd 396 BBC 700R4
1967 Pontiac Firebird 400
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Old 10-24-2007, 02:43 AM
Posted in reply to imiceman44's post starting "I think it was 81 and up, the dash..."
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Quote:
Originally Posted by imiceman44 View Post
I think it was 81 and up, the dash changed in 84
I was just researching this for my axle swap, and all of the parts places that I looked at online had the same part number up to '83, and the '84-'87(-'91) had the same part number.
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Old 10-24-2007, 04:03 AM   #6
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All, thanks for the information. I was planning on replacing the current e-brake cables since they are frayed and was looking to update to the 84 and up style. I think they run along side the rocker on the driver side instead of being separated and supported by hangers form the trans on back.

I'm doing a frame off restoration and the truck will most likely only see light wheeling, does it make sense to change over to 3/4 ton running gear? It's the 4:10's, and the price, that's pushing me in the direction of the axles. Will I be limited on wheel selection?

Yzeater, what exactly is a conversion joint?
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Old 10-24-2007, 04:09 AM
Posted in reply to 83k5blzrbob's post starting "All, thanks for the information. I was..."
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it allows 2 different sized yokes to be mated together.
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'11 cummins ccsb 6-speed, 5"tbe, mini maxx, egr & ccv delete
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Old 10-24-2007, 06:47 AM
Posted in reply to 83k5blzrbob's post starting "All, thanks for the information. I was..."
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Quote:
Originally Posted by 83k5blzrbob View Post
All, thanks for the information. I was planning on replacing the current e-brake cables since they are frayed and was looking to update to the 84 and up style. I think they run along side the rocker on the driver side instead of being separated and supported by hangers form the trans on back.

I'm doing a frame off restoration and the truck will most likely only see light wheeling, does it make sense to change over to 3/4 ton running gear? It's the 4:10's, and the price, that's pushing me in the direction of the axles. Will I be limited on wheel selection?

Yzeater, what exactly is a conversion joint?
going 3/4 ton to get the 4.10 ratio will be cheaper for you, and it's better stronger.
Wheel selection shouln't be a problem, if you want to go 15" and you want deep backspacing you might need to grind slightly on the calipers otherwise everything should work on the 3/4 tons.
As for the conversion U joint, you could bypass that and get a 1350 yoke for your Tcase and run a 1350 driveshaft, might be more expensive than the conversion U joint but you can get a better Ujoint and it will be a stock U joint that you can get at any store in cse of a failiure.
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1997 GMC savana
1991 crew cab no drivetrain for now
1989 Jetta 4 speed DD
1985 suburban 3/4 ton 4x4 6.2TD
1977 K5 chalet
1974 suburban 1/2 ton 4x4 350
1970 Chevy LB 2wd 396 BBC 700R4
1967 Pontiac Firebird 400
1965 Chevy Corvair coupe 110
1962 Chevy Corvair Van Greenbriar
1986 Honda 250 XL
1985 Honda Magna V45
1970 Wreidt 19' jet drive boat 455 olds
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Old 10-24-2007, 08:35 AM
Posted in reply to imiceman44's post starting "going 3/4 ton to get the 4.10 ratio..."
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83k5blzrbob
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Alright. looks like 3/4 tons it is. I'm planning to go look at the axles this weekend and if the're good, I will have some additional work ahead of me. Also I may have some 10 bolts for sale if it works out.

Thanks for the information, I hope I can return the favor sometime.
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