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Old 11-25-2009, 02:27 PM
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Gov Loc Carrier

I Recently Obtained A Rearend "chunk" From A Friend. From What I Found It Is Whats Called A Gov Loc Unit. I Own An 87 Cutlass And I Would Like To Use This Unit But I Dont Know Anything About What It Come Out Of. The Only Numbers On It Are 683-2;20 J I;j 10 B C . Ring Gear Has 875373 14281. WHAT IS THIS FOUND IN AND CAN IT WORK IN MY PRESENT HOUSING?Hopefully This Is Enough Info For Someone To Help Me On.

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Last edited by jkelly334; 11-25-2009 at 02:47 PM.
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Old 11-25-2009, 03:22 PM
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The gov lock unit is not a performance unit..... beyond a bone stock application the gov lock will spit parts out the cover if you hit it with much power very often.
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Old 11-25-2009, 03:55 PM
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gov lock carrier

but will it fit in my 87 cutlass? i dont plan on racing it yet and need to know what i need to do to make it work
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Old 11-25-2009, 04:18 PM
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50% chance you have a 8.5-inch Gov-Lok, but I have to run out to the shop in a few minutes.

I will measure the width of the 7.5 inch carrier I have sitting out there for comparison purposes.

I don't have an 8.5 carrier sitting around but also have a 8.875 truck carrier there, I'll measure that one too for the heck of it.

Do you happen to know the gear ratio stamped into the ring gear?

Last edited by M&M CUSTOM; 11-25-2009 at 04:23 PM.
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Old 11-25-2009, 04:30 PM
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Gov Loc Carrier

41-12 Which Would Be A 3.42.
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Old 11-25-2009, 04:39 PM
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Very common in both axles.

This was a little learning experience for me, I took pics of both the 7.5 and 8.875 inch carriers with ring gears on them, bearing-to-bearing they BOTH measured 7-5/16 inches.

You can narrow this right down by measuring the ring gear with a square and a square cut block of wood, because you will not be able to shove a ruler through the carrier like I did with the open carriers I have here.

I just did a Google search for each axle size, and found little differences in each of the Gov-Lok units that were found in the 7.5/7.625, 8.5/8.625, 8.875, 9.5 and 10.5 inch truck axles. The 10.5 looks completely different than any of the others.
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Last edited by M&M CUSTOM; 11-25-2009 at 05:48 PM.
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Old 11-25-2009, 08:23 PM
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Count thee splines in the axle gears. The 7.5 used 26 spline axles up to '90 and then used 28 spline axles. Your Cutlass will have 26 spline axles, so if this Gov Lock has more than 26 splines then you don't need to check any farther.

The 8.5 used 28 spline axles up to '88, and then they used both 28 and 30 spline axles up to '90 when all of them went to 30 splines.

If the ring gear is still on the differential then beasure the diameter of the gear. If it's 8 1/2 inches then it's the 8.5. If it measures 7 1/2 or 7 5/8 then it's the 7.5. Simple enough.

The gear ratio in your Cutlass will also determine if you can use this or not. If this unit had a 3.42 gear on it then it will be a 3 series. The 7.5 used the 3 series for 3.23 to 4.10 gears. If your Cutlass has a 3.08, 2.73, 2.56 or 2.41 gear then it won't work unles you change gears too.
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Old 11-27-2009, 07:27 AM
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Gov Loc Carrier

I Was Told That Any A Body Rearend From 64 - 77 Will Be A Direct Fit For My 87 Cutlass Supreme.is This True And If Not What Other 8.5 Will Be A Direct Fit
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Old 11-27-2009, 07:35 AM
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Thats is not true. The 64-67 rears are close to the same tread width, while the 68-72 are about 4" wider. The control arm mounts dont line up on either but you can force the arms in if you have rubber bushings, but not if you have poly.

A direct fit is a G-body 8.5 from a buick GN or 442 or some ElCamino.
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Old 11-27-2009, 07:50 AM
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Gov Loc Carrier

What About A 77-78 Cutlass?will That One Fit?
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Old 11-27-2009, 08:35 AM
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2 different cars, the 78 will have a 7.5 inch ring gear, not sure what the 77 would have, 2 completely different body styles and cars. The 77 will definitely have a wider axle too.

Did you ever figure out what carrier and gears you have?

The stock 8.5 axles that will fit directly in your car are very difficult to find as they are pretty rare, the short list of which cars they are found in is all over the forum do s search for "g-body 8.5 inch", I have seen this axle housing go for $500 with nothing in it, no gears or axleshafts, no cover, no bearings.

If you can find an axle from the earlier A-body cars in the right width, you can get adapter control arms to make the swap into your G-body work.

You can find a direct bolt in 12-bolt, ford 9-inch, or 8.5 inch with your choice of gears completely new ready to bolt in from several sources like Currie, Moser and the like for around $900-$2000 depending on all the extras you want or not.

Last edited by M&M CUSTOM; 11-27-2009 at 08:45 AM.
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Old 11-27-2009, 08:45 AM
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Gov Loc Carrier

28 Splines On The Inside Spider Gears Also 41-12 Ratio. I Did Slid It Into My 7.5 Housing But When I Tightened It In ,the Chunk Wouldnt Move Because The Gears Were Too Close And Needed To Be Shimed. Thinking It Is A 3 Series Carrier For A 7.5? MY AXLE SPLINE COUNT IS 26. CUOLD THIS CARRIER COME FROM A BLAZER AND IF SO WILL I NEED THI SAME AXLES?
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Old 11-27-2009, 09:19 AM
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The '64 to '67 A body rear ends are 60 inches wide over all. The '68 to '72 A body rear ends are 61 inches wide over all. The '73 to '77 rear ends are about '63 inches wide over all. The '78 to '87 G body rear ends are 58 inches wide over all. None of the suspension parts for any of these earlier rear ends will match up to what is in your car. You are limited to the '78 and later rear ends only. The G body Buick GN and T Type used the 8.5 and SOME of the 442s had the 8.5. These rear ends are very rare and expensive, and are the ONLY rear ends that will fit your car and be strong enough to handle any high performance use.

Don't even bother with the Governor Lock if you want to use it for high performance use. It will break. You can't use Blazer or any other axles in your rear end except G body axles. The only 28 spline G body axles that will fit your rear end are the 8.5 axles, and they take the wrong c clips for the 7.5. You will have to get custom made axles for it like Moser axles. It isn't worth the effort for the 7.5 rear end.

If you plan on using a lot of power in this car then you need to spend some money on a new after market rear end, like the Moser 12 bolt. You won't break it.
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