later model posi fit in a 70? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

70c10 · 07-03-2002, 08:04 AM

Will a 1978 6 lug posi with 3.73 fit my 70 6 lug?. What mods would I need to make?. Thanks

JimKshortstep4x4 · 07-03-2002, 08:50 AM

If the posi carrier and gears are out of a 12 bolt truck rear end it should be a direct replacement. I believe that the axles out of the later model are longer but the 70 axles will have the same spline.

Jim

70c10 · 07-03-2002, 09:10 AM

It is a 12 bolt just like mine. Will I just use "my" axles?

JimKshortstep4x4 · 07-03-2002, 12:09 PM

You can measure to make sure if they are the same length or not, but yes you can use your axles. Sometimes the axle bearing surfaces are spalled and the axle needs to be changed, so it is worth checking just in case you need one.

Jim

70c10 · 07-03-2002, 03:05 PM

Thanks Jim

*Fast68Chevy* · 07-06-2002, 05:37 PM

12 bolt internals are same, stay away from van 10 series axles though, they are only 2400 and 2900lb rated, the K10 are 3300 rated and ours in C-10 trucks are 3500lb and the van 20 series are the heaviest at 3600lb, G20 are 12 bolt also, this applies to all years of ther 12 bolt, '64-82

70-82 12 bolt pickup sjafts are same length, all 12 bolt at least 3300-up are 31 spline, cant say for sure on van ones, as i have run into a 17 spline pinion yoke one(2900lb) so.,,,,,, :S

07-03-2002, 08:04 AM	#1
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,857	later model posi fit in a 70? Will a 1978 6 lug posi with 3.73 fit my 70 6 lug?. What mods would I need to make?. Thanks __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads

07-03-2002, 09:10 AM	#3
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,857	It is a 12 bolt just like mine. Will I just use "my" axles? __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads

07-03-2002, 03:05 PM	#5
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,857	Thanks Jim __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads

07-03-2002, 08:50 AM	#2
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	If the posi carrier and gears are out of a 12 bolt truck rear end it should be a direct replacement. I believe that the axles out of the later model are longer but the 70 axles will have the same spline. Jim

07-03-2002, 12:09 PM	#4
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	You can measure to make sure if they are the same length or not, but yes you can use your axles. Sometimes the axle bearing surfaces are spalled and the axle needs to be changed, so it is worth checking just in case you need one. Jim

07-06-2002, 05:37 PM	#6
Fast68Chevy Account Suspended Join Date: May 2000 Location: IL Posts: 0	12 bolt internals are same, stay away from van 10 series axles though, they are only 2400 and 2900lb rated, the K10 are 3300 rated and ours in C-10 trucks are 3500lb and the van 20 series are the heaviest at 3600lb, G20 are 12 bolt also, this applies to all years of ther 12 bolt, '64-82 70-82 12 bolt pickup sjafts are same length, all 12 bolt at least 3300-up are 31 spline, cant say for sure on van ones, as i have run into a 17 spline pinion yoke one(2900lb) so.,,,,,, :S



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