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05-08-2012, 03:01 PM
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#1 |
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Registered User
Join Date: May 2011
Location: rochester ny
Posts: 176
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rear end swaps
87 1/2 ton 10 bolt / 5 lug
please list direct swaps that will bolt right in (burb,blazers/ c10-20) also spilnes looking to find something with better then 2.73 gears. there is a 10 bolt 5 lug from a 86 at my local pick and pull but its got 3.08 gears i dont think it will be worth it. thanks |
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05-08-2012, 03:01 PM
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#2 |
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Registered User
Join Date: May 2011
Location: rochester ny
Posts: 176
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Re: rear end swaps
oh looking for 3.73 gears is ideal
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05-08-2012, 04:01 PM
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#3 |
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Registered User
Join Date: Apr 2011
Location: corpus christi, tx - america's fattest city
Posts: 253
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Re: rear end swaps
Unless you have a manual or overdrive (700R4) transmission I wouldn't go higher than 3.08. A 3.73 is the max if you have a TH350 slush box, anything higher than that and you'll run out of pedal on the freeway.
Not sure what you're after here, are you building it for 1/4 mile launches? |
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05-08-2012, 04:04 PM
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#4 |
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Registered User
Join Date: May 2011
Location: rochester ny
Posts: 176
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Re: rear end swaps
ya light to light set up 2.73 blows! its a dog out of the hole
and yes 700r4 is what i got |
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05-08-2012, 04:06 PM
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#5 |
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Registered User
Join Date: Oct 2009
Location: Prescott, Arizona
Posts: 2,396
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Re: rear end swaps
I myself find 3.73's very streetable without an overdrive, as long as you run at least a 28" tire. I can cruise at 65 mph and it's only spinning 2800 rpms. Pretty comfortable compared to my 4.88 car
 Driven accross country twice with 3.73's and no overdrive. I think you guys are getting soft with all your creature comforts 
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05-08-2012, 04:15 PM
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#6 |
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Registered User
Join Date: May 2011
Location: rochester ny
Posts: 176
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Re: rear end swaps
ahhahah
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05-08-2012, 07:43 PM
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#7 |
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BAD BOW-Silverado XST
Join Date: May 2000
Location: Senior Member from Austin, TX
Posts: 6,431
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Re: rear end swaps
I run a '77 12 bolt 3.08 under my 83. I ditched the 2.73 gears because they whined. 3.08's with a <27" tires are okay. Any larger and 3.42 or 3.73 are better. 18.5 MPG at 70 MPH. 13-15 city with my foot out of it.
You just need power and full throttle to really light them up!! |
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05-08-2012, 11:03 PM
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#8 |
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Registered User
Join Date: May 2011
Location: rochester ny
Posts: 176
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Re: rear end swaps
Hell ya there is a 85-89 burb at the junk yard what gears did they come with?
Posted via Mobile Device |
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05-08-2012, 11:12 PM
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#9 |
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BAD BOW-Silverado XST
Join Date: May 2000
Location: Senior Member from Austin, TX
Posts: 6,431
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Re: rear end swaps
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05-09-2012, 09:53 AM
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#10 |
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Registered User
Join Date: Mar 2012
Location: Woodbury, Ct.
Posts: 1,694
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Re: rear end swaps
The burb will be 6 lugs..Unless its 2wd.
3.73 and the 700r tranny is a real nice setup. with a 29" tire 2000rpm at 65mph. Nice highway cruising and you can smoke the tires too... |
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05-09-2012, 04:42 PM
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#11 |
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Registered User
Join Date: May 2011
Location: rochester ny
Posts: 176
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Re: rear end swaps
say the burb is 6 lug whats the spline ? so i can swap axels for my 5 lug
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05-09-2012, 04:53 PM
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#12 |
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Registered User
Join Date: May 2011
Location: rochester ny
Posts: 176
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Re: rear end swaps
oh also will van rear ends bolt right in ?
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05-09-2012, 05:28 PM
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#13 |
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Getting Old; Going Broke
Join Date: Apr 2010
Location: Owasso OK
Posts: 2,764
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Re: rear end swaps
Van rear end is going to be different. You'll be wanting to look at the square bodies only, C10 trucks and suburbans.
4x2, 2.73 ratio (opt GU2) 4x2, 3.08 ratio (opt GU4) 4x2, 3.42 ratio (opt GU6) 4x2, 3.73 ratio (opt GT4) I personally like the 3.42's in my 87 and it will probably be one of the most common ratios you'll find in the junk yards.
__________________
Why is every used 350 sbc out of a corvette? There's only two things that excite a man, expensive toys and real expensive toys. VEGETARIAN: That's an old Indian word meaning "I don't hunt so good." When the going gets tough, switch to power tools. |
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05-09-2012, 05:32 PM
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#14 |
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Registered User
Join Date: May 2011
Location: rochester ny
Posts: 176
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Re: rear end swaps
thanks i just need to find out what is the splines with 2wd 10 bolts 5 lug and 4x4 spilines 6 lug so if i have to i can swap axels
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05-09-2012, 05:32 PM
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#15 |
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Registered User
Join Date: May 2011
Location: rochester ny
Posts: 176
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Re: rear end swaps
man i love this board
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05-09-2012, 07:15 PM
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#16 |
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Registered User
Join Date: Oct 2009
Location: Prescott, Arizona
Posts: 2,396
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Re: rear end swaps
The 8.5" 10 bolts were 28 spline until about the 1988 model year when the change over to 30 spline axles began. I've seen some with and without till about 1990, then they all seem to be 30 spline.
I'm speaking soley on the 8.5" 10 bolts that were used in 1/2 ton trucks after about 1980. Not sure what the 4x4's would have had for a rearend but I assume 8.5's in the 1/2 ton 4x4 also. Anything heavier (3/4 ton and up) should have a corporate 14 bolt I believe. |
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05-09-2012, 08:11 PM
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#17 |
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Registered User
Join Date: Mar 2012
Location: Woodbury, Ct.
Posts: 1,694
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Re: rear end swaps
I grabbed a posi out of a burb and 5 lug axles out of 90s pickup.
So now I have a 30 spline posi. The axles are about 7/16" longer. Used a pair of Buick roadmaster drums to compensate. Posted via Mobile Device |
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05-10-2012, 09:32 AM
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#18 | |
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Registered User
Join Date: May 2011
Location: rochester ny
Posts: 176
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Re: rear end swaps
Quote:
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05-10-2012, 09:10 PM
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#19 |
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Registered User
Join Date: Apr 2012
Location: Kingdom of Bahrain
Posts: 148
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Re: rear end swaps
 1995 Impala SS rear end in my '82 short bed I had to weld shock brackets and leaf springs brackets other than that it perform great 30 spline and 3.08 on stalled 3600 TH350 very highway friendly Posted via Mobile Device
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05-11-2012, 04:24 PM
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#20 | |
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Registered User
Join Date: May 2011
Location: rochester ny
Posts: 176
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Re: rear end swaps
Quote:
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05-11-2012, 04:25 PM
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#21 |
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Registered User
Join Date: May 2011
Location: rochester ny
Posts: 176
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Re: rear end swaps
also photo wont show up lol
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05-13-2012, 11:22 AM
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#22 |
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BAD BOW-Silverado XST
Join Date: May 2000
Location: Senior Member from Austin, TX
Posts: 6,431
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Re: rear end swaps
You can find a Caddy or Lincoln 5X5 disc rear end too. Just weld new perches and mount.
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05-14-2012, 09:30 AM
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#23 |
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Registered User
Join Date: May 2011
Location: rochester ny
Posts: 176
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Re: rear end swaps
couldnt find anything good only a 1995 chevy pick up. but didnt check gears due to the fact i think 95 wont fit in my truck
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09-15-2012, 04:06 AM
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#24 | |
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Registered User
Join Date: Jan 2010
Location: Brandon, Manitoba, Canada
Posts: 782
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Re: rear end swaps
Quote:
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1967 K30 4x4/12v Cummins/getrag/D60/D70/355s 1967 GMC suburban 4x4/LS swap 5.3/4500/205/10 bolt/14 bolt full floater 1963 C10 reg cab long box 1970 Chevelle 1968 Biscayne 2dr post "...there is no excuse for what I am about to do, but dangit....it's gonna be fun!" |
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09-15-2012, 05:10 AM
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#25 | |
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Registered User
Join Date: Apr 2012
Location: Kingdom of Bahrain
Posts: 148
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Re: rear end swaps
Quote:
Posted via Mobile Device
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