Most reasonable locker upgrade?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Longhorn 70 · 02-07-2013, 03:17 PM

Hi guys. I have a 70 C20 that I'd like to have posi in the rear. It is a one legged tire burner that needs to burn more evenly.

It has a 14 bolt FF 4.10 rear but not posi or locked. Don't know ring gear size.

What would be the best bang for the buck to get both tires spinning while going straight? I know it should get new bearings and seals at the same time as the rear end has 300K miles on it.

Thanks in advance

Longhorn 70 · 02-26-2013, 01:41 PM

Will this Detroit Locker fit a 70 C20 full floater 4.11? I have emaile the seller too. Anyone have experience with these?

SS Tim · 02-26-2013, 02:36 PM

First off do you have the original axle? An Eaton 5200 (HO52) or Dana 5500 (Dana 60) would have been stock. The "14 bolt" is a later axle and the internals are not a direct interchange with the Eaton 5200/7200 axles. IIRC the later locker will fit in the Eaton case but the axle spline is wrong.

If you have an Eaton then the Eaton 5200/7200 (HO52/72) specific NoSpin is the only option as far as I know.

KEL · 02-26-2013, 02:44 PM

Funny you should ask.
Because I just did on the "4X4" forum.
http://67-72chevytrucks.com/vboard/s...d.php?t=566255

Longhorn 70 · 02-26-2013, 02:45 PM

Thanks Tim.

Yes I have the original axle in there. SO it looks like I will have to go another way. I think I'd like both wheels to spin when I nail the gas or go off road. I have been stuck a couple times and putting on the e-brake got me out once or twice. Not every time.

SS Tim · 02-26-2013, 03:07 PM

http://67-72chevytrucks.com/vboard/s...d.php?t=536119

02-07-2013, 03:17 PM	#1
Longhorn 70 Registered User Join Date: Dec 2012 Location: Chandler AZ Posts: 1,149	Most reasonable locker upgrade?? Hi guys. I have a 70 C20 that I'd like to have posi in the rear. It is a one legged tire burner that needs to burn more evenly. It has a 14 bolt FF 4.10 rear but not posi or locked. Don't know ring gear size. What would be the best bang for the buck to get both tires spinning while going straight? I know it should get new bearings and seals at the same time as the rear end has 300K miles on it. Thanks in advance __________________ 1970 Longhorn, Front Disc, 350/4 bolt, 882 heads, HEI, Edelbrock, 700R4, HO-52/4.11. 1996 Corvette, Collector Roadster, LT4, 396, 450RWHP, 6sp, 4.11/Dana44/posi 5 point roll bar And let us not grow weary of doing good, for in due season we will reap, if we do not give up. Gal 6:9 Last edited by Longhorn 70; 02-07-2013 at 03:40 PM.

02-26-2013, 01:41 PM	#2
Longhorn 70 Registered User Join Date: Dec 2012 Location: Chandler AZ Posts: 1,149	Re: Most reasonable locker upgrade?? Will this Detroit Locker fit a 70 C20 full floater 4.11? I have emaile the seller too. Anyone have experience with these? __________________ 1970 Longhorn, Front Disc, 350/4 bolt, 882 heads, HEI, Edelbrock, 700R4, HO-52/4.11. 1996 Corvette, Collector Roadster, LT4, 396, 450RWHP, 6sp, 4.11/Dana44/posi 5 point roll bar And let us not grow weary of doing good, for in due season we will reap, if we do not give up. Gal 6:9

02-26-2013, 02:36 PM	#3
SS Tim Registered User Join Date: Aug 2010 Location: Edwards, CA Posts: 7,503	Re: Most reasonable locker upgrade?? First off do you have the original axle? An Eaton 5200 (HO52) or Dana 5500 (Dana 60) would have been stock. The "14 bolt" is a later axle and the internals are not a direct interchange with the Eaton 5200/7200 axles. IIRC the later locker will fit in the Eaton case but the axle spline is wrong. If you have an Eaton then the Eaton 5200/7200 (HO52/72) specific NoSpin is the only option as far as I know. __________________ Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID Blazer SPID Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders Do you have a 1972 Plaid Pickup? Plaid Blazer ** Plaid Suburban

02-26-2013, 02:44 PM	#4
KEL 72 GMC Join Date: Feb 2008 Location: Wells, Maine Posts: 534	Re: Most reasonable locker upgrade?? Funny you should ask. Because I just did on the "4X4" forum. http://67-72chevytrucks.com/vboard/s...d.php?t=566255

02-26-2013, 02:45 PM	#5
Longhorn 70 Registered User Join Date: Dec 2012 Location: Chandler AZ Posts: 1,149	Re: Most reasonable locker upgrade?? Thanks Tim. Yes I have the original axle in there. SO it looks like I will have to go another way. I think I'd like both wheels to spin when I nail the gas or go off road. I have been stuck a couple times and putting on the e-brake got me out once or twice. Not every time. __________________ 1970 Longhorn, Front Disc, 350/4 bolt, 882 heads, HEI, Edelbrock, 700R4, HO-52/4.11. 1996 Corvette, Collector Roadster, LT4, 396, 450RWHP, 6sp, 4.11/Dana44/posi 5 point roll bar And let us not grow weary of doing good, for in due season we will reap, if we do not give up. Gal 6:9

02-26-2013, 03:07 PM	#6
SS Tim Registered User Join Date: Aug 2010 Location: Edwards, CA Posts: 7,503	Re: Most reasonable locker upgrade?? http://67-72chevytrucks.com/vboard/s...d.php?t=536119 __________________ Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID Blazer SPID Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders Do you have a 1972 Plaid Pickup? Plaid Blazer ** Plaid Suburban

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