rear end swap????????????? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

*rayville body* · 01-22-2003, 09:32 AM

will the rear end from a 86 3/4 ton bolt right under my 70 3/4 ton?

crazy longhorn · 01-22-2003, 10:15 AM

Is your 70 leaf or coil?

*rayville body* · 01-22-2003, 02:56 PM

my 70 has leafs on the rear

crazy longhorn · 01-22-2003, 03:03 PM

I think you will find the spring pads to line up on the 2wd trucks, but will need to weld on the shock mounts from the 70. good luck....crazyL

72shadetree · 01-22-2003, 03:04 PM

my 72 has leafs and i had a 76 rear put in it i cant rember but i think it was something he cut off and swapped sides or something but its not a direct bolt in but will fit with minor mods maybe someone else knows more

Fred T · 01-22-2003, 04:33 PM

Measure the drum to drum distance. They're not all the same.

*rayville body* · 01-26-2003, 11:40 PM

the rear end i have is a 14 bolt corp with 4.10s. i dont think it a full floater but i havent looked to make sure yet and it has the cone shaped drums. it does not have a posi unit. is it possible to put 9/16 lug studs in the 70 axles? if so i might just leave it where is at

*rustedchevy* · 01-27-2003, 03:03 AM

if its full floater then it wil have the hubs that stick out about 2.5" that the ends of the axle shafts bolt onto(to the drums)

if its from a 73-80 then its an FF

could have 9/16" studs put in if you have a shop centerdrill the 1/2 holes out to 9/16" or swap in 9/16" studs axle shafts

good luck

Mike C · 01-27-2003, 11:16 AM

rusted chevy, he has a full floater axle, so studs are not in the shaft.

Pull your axleshafts, remove the hubs, and have a local machine shop drill them for an interference fit for 9/16 studs you buy at the parts store. You can hammer the old studs out, but take at least one so the shop can measure the amount of interference before drilling the new holes. Obviously they should have the new ones as well... Another option is getting the hubs off of a 71-72 truck and swapping those on to your truck.

*rayville body* · 01-27-2003, 03:35 PM

i looked at the donor rear in the 86 and its not a floater. the axles look just like the ones on my 1/2 ton but have 8 lugs. i havent got the 70 home yet to look at it but when i do i will post it then go from there.

crazy longhorn · 01-27-2003, 04:48 PM

The 70 will be a full floater, as posted above.......unless it has been changed by a former owner. ....crazyL

01-22-2003, 09:32 AM	#1
rayville body Account Suspended Join Date: Nov 2002 Location: rayville,LA Posts: 226	rear end swap????????????? will the rear end from a 86 3/4 ton bolt right under my 70 3/4 ton?

01-22-2003, 10:15 AM	#2
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	Is your 70 leaf or coil? __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

01-22-2003, 03:03 PM	#4
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	I think you will find the spring pads to line up on the 2wd trucks, but will need to weld on the shock mounts from the 70. good luck....crazyL __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

01-22-2003, 03:04 PM	#5
72shadetree KEEP ON TRUCKING Join Date: Sep 2000 Location: martinsville va Posts: 2,563	my 72 has leafs and i had a 76 rear put in it i cant rember but i think it was something he cut off and swapped sides or something but its not a direct bolt in but will fit with minor mods maybe someone else knows more __________________ 72 cheyenne 2wd lwb 71 k20 sons bassett va

01-22-2003, 04:33 PM	#6
Fred T Cantankerous Geezer Join Date: Aug 2002 Location: Bel Aire, KS Posts: 6,264	Measure the drum to drum distance. They're not all the same. __________________ Fred There is no such thing as too much cam...just not enough engine.

01-22-2003, 02:56 PM	#3
rayville body Account Suspended Join Date: Nov 2002 Location: rayville,LA Posts: 226	my 70 has leafs on the rear

01-26-2003, 11:40 PM	#7
rayville body Account Suspended Join Date: Nov 2002 Location: rayville,LA Posts: 226	the rear end i have is a 14 bolt corp with 4.10s. i dont think it a full floater but i havent looked to make sure yet and it has the cone shaped drums. it does not have a posi unit. is it possible to put 9/16 lug studs in the 70 axles? if so i might just leave it where is at

01-27-2003, 03:03 AM	#8
rustedchevy Account Suspended Join Date: Jan 2003 Location: il Posts: 115	if its full floater then it wil have the hubs that stick out about 2.5" that the ends of the axle shafts bolt onto(to the drums) if its from a 73-80 then its an FF could have 9/16" studs put in if you have a shop centerdrill the 1/2 holes out to 9/16" or swap in 9/16" studs axle shafts good luck

01-27-2003, 11:16 AM	#9
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,728	rusted chevy, he has a full floater axle, so studs are not in the shaft. Pull your axleshafts, remove the hubs, and have a local machine shop drill them for an interference fit for 9/16 studs you buy at the parts store. You can hammer the old studs out, but take at least one so the shop can measure the amount of interference before drilling the new holes. Obviously they should have the new ones as well... Another option is getting the hubs off of a 71-72 truck and swapping those on to your truck. __________________ 44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax

01-27-2003, 03:35 PM	#10
rayville body Account Suspended Join Date: Nov 2002 Location: rayville,LA Posts: 226	i looked at the donor rear in the 86 and its not a floater. the axles look just like the ones on my 1/2 ton but have 8 lugs. i havent got the 70 home yet to look at it but when i do i will post it then go from there.

01-27-2003, 04:48 PM	#11
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	The 70 will be a full floater, as posted above.......unless it has been changed by a former owner. ....crazyL __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

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