wanting to put a dana 70 rear end in... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

East End K5 · 03-15-2012, 10:15 AM

hey guys. I was thinking about putting in a dana 70 dually rear end with disc brakes on my k3500 frame while doing the cab swap. How do I go looking for one? What am I supposed to look for? I have a chevy 14 single rear now. My goal is to go dually but either way the 14 doesnt have long enough inner axles shafts. I DO have a rear dually for parts but its a cab and chassis dually rear, which is shorter. Or should i go and look for a disc brake conversion and would finding dually inner axle shafts work with my exisiting rear?

Rubble · 03-15-2012, 04:14 PM

I am not sure if you mean cab& chassis when you say frame,but I am in the process of converting a dually to single that has a box.I swapped out a dana 70 for a 14 bolt and had to change spring hangers because the 14's spring perches were about an 1" too wide.The 14 is a single wheel version also.I probably could have moved perches too,but the old hangers had elongated holes so that's why I went that route.IMO (others might disagree) the 14 is probably lots heavy enough for most 1 ton apps in a truck of that vintage anyway.....The reason I did the swap was the 70 had 4:56 gears and the 14 has 3:42, this is in a 6.2 and I am looking for some mileage,if I need to tow something I have Dodge with a 5.9.
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East End K5 · 03-15-2012, 04:37 PM

oh ok, I have 2 trucks. One is a 1980 cab and chassis donor, and a 1986 K3500 gmc high sierra frame, which will recieve the cab clip and engine and stock wheels from the donor, also wanting to make it dually. Sounds like it may be too much to deal with. Maybe I will look for the inner axles then

liftlawssuck · 03-15-2012, 06:49 PM

Well this is too funny. I am thinning out the built up parts around my house trying to get free up space and was thinking of selling mine. I have 1 from a mid 80's chevy 1 ton dump. No idea of miles or anything. Would need to be gone through. I have no idea of what it's worth either.

ghettoluxury · 03-15-2012, 10:32 PM

Just buy 2.5" wheel spacers and use your current axle. A single wheel 14 bolt is 67" and a Dana 70 is 72". It is easy to swap disc brakes onto a 14 bolt and brackets can be had for $65 shipped to your door.

03-15-2012, 10:15 AM	#1
East End K5 Registered User Join Date: Nov 2004 Location: Long Island NY Posts: 293	wanting to put a dana 70 rear end in... hey guys. I was thinking about putting in a dana 70 dually rear end with disc brakes on my k3500 frame while doing the cab swap. How do I go looking for one? What am I supposed to look for? I have a chevy 14 single rear now. My goal is to go dually but either way the 14 doesnt have long enough inner axles shafts. I DO have a rear dually for parts but its a cab and chassis dually rear, which is shorter. Or should i go and look for a disc brake conversion and would finding dually inner axle shafts work with my exisiting rear? __________________ I feel sorry for people who don't drink....because when they wake up in the morning, that's the best they're gonna feel all day long!---Frank Sinatra RIP [B]1972 Chevrolet K5 Blazer RIP 1986 GMC Sierra K3500 1TON, Long Box, V8350 RIP 1980 Chevy Silverado C30 Cab and Chassis, 454 TH400HD. RIP [B] 1995 Chevrolet Tahoe 2D [B]

03-15-2012, 04:14 PM	#2
Rubble Registered User Join Date: Feb 2012 Location: Big Valley. Alberta Posts: 674	Re: wanting to put a dana 70 rear end in... I am not sure if you mean cab& chassis when you say frame,but I am in the process of converting a dually to single that has a box.I swapped out a dana 70 for a 14 bolt and had to change spring hangers because the 14's spring perches were about an 1" too wide.The 14 is a single wheel version also.I probably could have moved perches too,but the old hangers had elongated holes so that's why I went that route.IMO (others might disagree) the 14 is probably lots heavy enough for most 1 ton apps in a truck of that vintage anyway.....The reason I did the swap was the 70 had 4:56 gears and the 14 has 3:42, this is in a 6.2 and I am looking for some mileage,if I need to tow something I have Dodge with a 5.9. Posted via Mobile Device __________________ 1977 Chev C30 454/465/14ff DRW 1974 Chev C20.350/465/14ff " Rock n Roll ain't noise pollution"

03-15-2012, 04:37 PM	#3
East End K5 Registered User Join Date: Nov 2004 Location: Long Island NY Posts: 293	Re: wanting to put a dana 70 rear end in... oh ok, I have 2 trucks. One is a 1980 cab and chassis donor, and a 1986 K3500 gmc high sierra frame, which will recieve the cab clip and engine and stock wheels from the donor, also wanting to make it dually. Sounds like it may be too much to deal with. Maybe I will look for the inner axles then __________________ I feel sorry for people who don't drink....because when they wake up in the morning, that's the best they're gonna feel all day long!---Frank Sinatra RIP [B]1972 Chevrolet K5 Blazer RIP 1986 GMC Sierra K3500 1TON, Long Box, V8350 RIP 1980 Chevy Silverado C30 Cab and Chassis, 454 TH400HD. RIP [B] 1995 Chevrolet Tahoe 2D [B]

03-15-2012, 06:49 PM	#4
liftlawssuck Registered User Join Date: Mar 2011 Location: MA Posts: 353	Re: wanting to put a dana 70 rear end in... Well this is too funny. I am thinning out the built up parts around my house trying to get free up space and was thinking of selling mine. I have 1 from a mid 80's chevy 1 ton dump. No idea of miles or anything. Would need to be gone through. I have no idea of what it's worth either.

03-15-2012, 10:32 PM	#5
ghettoluxury Registered User Join Date: Apr 2009 Location: Waynesfield Ohio Posts: 1,991	Re: wanting to put a dana 70 rear end in... Just buy 2.5" wheel spacers and use your current axle. A single wheel 14 bolt is 67" and a Dana 70 is 72". It is easy to swap disc brakes onto a 14 bolt and brackets can be had for $65 shipped to your door. __________________ 1949 Five Window, 1973 Step Side, 2000 Z71

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