Question about 1985 Chevrolet Chevy

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Rear end has limited slip seems to have posi track 1985 chevy truck

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What chevy trunk has a positive track rear end

Posted on Mar 16, 2011

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Why 4x4 doesn't turn all 4 wheels at same time? 4hi-4lo


4X4 actually provides power to the front 2, and the back 2.
Unless the back has limited slip or posi-track, if 1 wheel spins, the other will not turn.
Since the front wheels have to turn at different rates to accomodate turning radius differences, there is (usually) to limited slip on the front differential, so if one wheel spins, the other will not turn.
So, if you have one front wheel spinning at the same time as one back wheel is spinning, and you don't have posi-trac, you're stuck.
Cheerfuls.

Nov 11, 2015 | 1998 GMC Sierra

1 Answer

Ok so if i get a rear end from the junkyard and try to get the same one its gonna cost me more just cuz its a limited slip posi.? So then would it be possible to get an old one that has drum brakes a


You take yours apart & make the necessary
repairs,you don't want some elses junk from
a salvage yard

There is only 3 things that could happen to your

The outer axle bearings
The Posi Clutches
Or you ran it out of fluid from a leak,
in which case you install new carrier
bearings & clutches

If it could do that at 19 with no experience
or help 48 years ago ,well !

Mar 15, 2013 | 1999 GMC Sierra

1 Answer

I have a 2002 F250 V8 4X4. i was pulling a Chevy out of the dirt (true story) and i noticed only my back wheels were spinning. i had it in 4H and 4L but only the back wheels spun. how can i tell if my 4...


When on soft dirt or gravel, engage the 4wd. From a stop position, accelerate quickly to spin the tires. Inspect your starting position for spin marks. There should be marks in the dirt or gravel on opposite sides from front to rear. The rear may have two marks depending on limited slip or posi rear end.

Nov 29, 2011 | Ford F-250 Cars & Trucks

1 Answer

The problem sounds and looks like its in my rear end when i turn left or right my rear end acks like its locked in and my rear tire sqeel but when im driving foward or back it dont act up. it only does...


Sounds like you have a limited slip or " Posi-Traction" rear differential, if this is the case than go to the GM dealer and ask them for a bottle of friction modifier oil for limited slip differential. This stuff is pure whale oil that helps to lubricate the clutches in the differential. After adding the lube find your self a big empty parking lot or other paved surface and drive the vehicle forwards then backwards in a slow figure 8 patern, turn as tight as you can each way, this will force the clutches to work and help limber them up. The differential might make some crunching sounds, but the noise should quit as the lube gets in and does its job.

Apr 14, 2010 | 2004 Chevrolet TrailBlazer

2 Answers

Truck has vibration,Rear wheels jacked off up off ground,transmission in park,wheels still turn,driveshaft doesnt.


trucks have a limited slip rear end to help in turning. if both back tires are in the air they will turn,the drive shaft wont turn because its in park. to check the vibration you might check the balance of your tires

Apr 09, 2010 | 2006 Ford Super Duty F 450 Drw

2 Answers

Want to change gears in rear end for posi traction in a 98 gmc25000 is this possible?


It is possible, you just have to know what gear ratio you have in your Sierra. I had issues with my son's rear differential and did the Salvage Yard and picked one up for $250.00 with less then 45,000 miles. Remember new cars end up at Salvage Yards also.

Here are the Pro code for the rear ends to your Sierra and you can match one up at a Salvage Yard.
GQ1 -- AXLE REAR, STD RATIO
GT4 -- AXLE REAR, 3.73 RATIO
GT5 -- AXLE REAR, 4.10 RATIO
GU4 -- AXLE REAR, 3.08 RATIO
GU5 -- AXLE REAR, 3.23 RATIO
GU6 -- AXLE REAR, 3.42 RATIO
G80 -- AXLE REAR, LIMITED SLIP (POSI TRACTION)

HC4 -- AXLE REAR, 4.56 RATIO

Open Your glove box and look inside it. Should be a list of codes on the bottom.
Example: GU6 G80 According to that, you'll have a 3.42 posi

Good luck and keep me posted and call around Salvage Yards, there prices will differ from one to the next salvage yard and don't ask them for a posi rear end. The cost will you more, just search all the SUV's and look at the pro codes in the glove box. Hunt, most awd system SUV will have the G80 rear end.

Good luck and keep me posted.

Jan 10, 2010 | 1993 GMC Sierra K1500

2 Answers

I have a 71 C10 with a posi rear end. When I turn


Make a series of tight turns in both directions if posi plates are stuck often that will free them. I have no idea what a chunk is so I'll refrain from commenting on that one.

Sep 27, 2009 | Chevrolet Chevy Cars & Trucks

1 Answer

Rear End in a 2000 silverado moning whenever I turn a corner.


I would suggest a rear differential service. When the fluid breaks down in the rear it doesn't provide the proper lubrication for the rear and you'll hear the "moan". Don't forget to buy and add the limited slip(posi-trac) additive.

As far as the rear end noise, There was a TSB released on GMC light duty trucks that says "Some owners of light duty trucks equipped with automatic transmissions may comment that the vehicle exhibits a clunk noise when ******* between Park and Drive, Park and Reverse, or Drive and Reverse... Whenever there are two or more gears interactin with one another, there must be a certain amount of clearance between those gears in order for the gears to operate properly. This clearance of freeplay (also known as lash) can translate into a clunk noise whenever the gear is loaded and unloaded quickly, or whenever the direction of rotation is reversed." It goes onto say "...Whilse some owners may find the clunk objectionable, this will not adversely affect durability or performance."

Apr 16, 2009 | 1999 Chevrolet Silverado 1500

1 Answer

DIY Repair


Your explanation is stating two different rear end styles. Limited slip and posi-traction. But either way if you have a wheel that won't engage when one slips with limited slip or one that doesnt turn with posi then you either have a broken axle or an internal differential issue which can be confirmed by pulling the rear cover off the diff.

Jan 19, 2009 | 1984 Dodge Pickup 4WD

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