pontiac g8 v6 differential swap help!! - Pontiac G8 Forum: G8 Forums - G8Board.com
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post #1 of 32 (permalink) Old 01-27-2013, 04:02 PM Thread Starter
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pontiac g8 v6 differential swap help!!

so i was involved in a crash damaged my rear sub frame i opted for a new used one from a pontiac g8 gt, we dropped in the whole thing, fit like a glove,

first test drive was rough maybe cause i did not have an alignment then after reaching 25 mph the engine shuts off and abs light flashes which cause the rear to lock up and my car skids.

just wondering what went wrong, i am only running the new lsd diff on the v6, also since it is a v8 subframe the only difference are the breaks again they fit it perfect, i am wondering if the abs sensors in the v8 drum brake is actually not reading right to the car v6 abs censors, not sure if that makes sense. could the differential really not be compatible or is it broken. will post pics soon.


if anyone can give me some advice, truly appreciate it.
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post #2 of 32 (permalink) Old 01-28-2013, 10:51 AM Thread Starter
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No one knows, what this may be. The car is throwing abs, traction control codes. When I start the car and engage it into drive it turns but sound like something is grinding then after a while it stops turning.


Another thing when car is lifted up from the rear and is on neutral the rear tires are very hard to move. Makes believe the diffirential or the brakes are locked up.
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post #3 of 32 (permalink) Old 01-28-2013, 11:09 AM
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Did you tune for the difference in rear?

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post #4 of 32 (permalink) Old 01-28-2013, 11:20 AM
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did you hook up the wheel speed sensors on each rear hub?

I do not know if they are different part numbers between v6 and v8, but it's a start.

The car certainly did an about-face when it realized that it had invasive surgury without it's consent.


I'd research the part numbers and differences for the VSS's and if cheap enough, swap in a set of V6 VSS's for the rear (if possible).

I have heard of people successfully replacing the "peg leg" V6 rear diff with that of the Posi GT rear diff... so chances are that is NOT the problem. Same OD tire size on V6 rims and V8 rims means that you shouldn't have different ratios from your front rims to your rear axle... unless there's something you're not telling us, such as "yea, I put 20" rims on the back with my stock 18's on the front" kinda story. I assume that you have all 4 rims on there from before.

Get your codes read (there's most certainly at least a few in there if the car suffered a self-inflicted shutdown) ... and go from there.

My money is on the wheel hub.


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post #5 of 32 (permalink) Old 01-28-2013, 11:21 AM
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EDIT: After reading your most recent post ... can you shift the car into neutral and raise BOTH rear tires and spin them freely? If not, inspect brakes, parking brake drum assumbly on both sides, and driveshaft clearance. Use safe Jacking techniques, jackstands on known-good points or lift, or....

With the car up in the air and the shifter shifted into neutral (key will need to stay in "run position" with car powered off for this to work properly) .... both wheels should turn freely with minimal interference. If neither turn, could be diff, could be tranny issue or something else. If they one turns but the other one is trouble turning, start disassembly to find out why. If they both turn freely, then check for codes and see if that gives you clues.

What was the source of your rear subframe cradle? You sure it wasn't jacked up already? If it has been sitting rusting in a junkyard under a totalled-out GT car, I wouldn't trust it any more than the one you extracted from your car with the damage.


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post #6 of 32 (permalink) Old 01-28-2013, 07:27 PM Thread Starter
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so i had my uncle come over lunch and look at the differential he told me the differential does not have any diff oil so now i have to get some, what is the best oil to use for a diff with 50,000 miles.

now for the abs codes and traction control i can not figure that out before the crash those codes werent really a problem they did flash when it happened but went away after i had the car just sitting around, now after replacing the whole rear end and starting it up the codes went off.

i do think the sensor for abs might be an issue not sure how it will be because both sensors look identical. i need to take pictures so you guys can see.

and i have read the same post about v8 diffs working on a v6 but i dont know if those people were actually telling the truth or have heard that is was possible just from hearsay, anyway im gonna try the oil, and check part sensors, anything else i should be checking?
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post #7 of 32 (permalink) Old 01-28-2013, 08:34 PM
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I'm sorry to have to tell you this but if you ran that rear with NO OIL you probly ruined it. There's lots of little parts in there and without oil they don't live very long. It sounds to me like your new rear is toast too.
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post #8 of 32 (permalink) Old 01-28-2013, 08:50 PM
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pontiac g8 v6 differential swap help!!

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Originally Posted by jackalope View Post
I'm sorry to have to tell you this but if you ran that rear with NO OIL you probly ruined it. There's lots of little parts in there and without oil they don't live very long. It sounds to me like your new rear is toast too.
I gotta agree with jackalope on this one. Oil for our diffs is expensive, I wouldn't waste your money dumping oil in it now. If the rear tires locked up and it's making grinding noises then it's toast.


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post #9 of 32 (permalink) Old 01-28-2013, 09:40 PM
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you ran the diff without diff fluid?

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post #10 of 32 (permalink) Old 01-28-2013, 11:29 PM
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If you had the diff delivered they probably drained the oil. I was told you can't ship a diff with liquid in it.

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post #11 of 32 (permalink) Old 01-29-2013, 01:49 AM Thread Starter
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Yes, I'm regretting not checking the damn oil I feel like such a newb!!!
I already bought the diff fluid, royal purple 75 90 synthethic for LSD diff, it started to run better, I do think I might of damaged some teeth only time would tell if I need to replace it. It is really not 100 percent smooth but I hope a little more fluid or some Lucas oil will help out.

One thing I learned from the diffirential it locks up on its own if it notices something is wrong not sure how that works since there is no harness to it, could there be a abs sensor inside to protect it from harm at low speed.

I'm actually pretty bummed about that but I honestly got the whole rear sub frame with the differential and all suspension parts for 700 bucks. How long can I drive on it before it needs to be replaced and what other differential is a good option.
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post #12 of 32 (permalink) Old 01-29-2013, 05:56 AM
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I'm assuming that you have a G8GT and you put a 6 banger rear in. If you have a gt I would find a gt diff this time for the install. Usually they'll put a tag on the rear after its drained so you'll know to add fluid. I would call them and let them know if they did not tag it. They could be liable if they didn't, then I would work out a deal for them to send you the correct diff if you have a gt.

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post #13 of 32 (permalink) Old 01-29-2013, 06:59 AM
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I could be mistaken, but I understood it as the OP (independant from what his avatar pic might show) HAS a V6 car and INSTALLED a GT rear end with no fluid. Or at least that's how I phrased my response above.

If he had a GT and via post #1 installed a GT rear end, this would be a non-issue. Likewise, from the title of this thread, if he had a v6 and he put in a v6 (pegleg) rear end, it would also be a non-issue. Both "non-issue" statements assuming that proper fluids were checked prior to testing, he may have cooked his diff this time and might need to fork over another 700 for another one.

Metal on metal with no lubrication heats up very quickly, and from what you describe hard lock with skidding involved, this was not a MINOR issue. Parts may have become fused together from the weight of the car multiplied by the speed at which you were going when the catastrophic failure occurred.


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post #14 of 32 (permalink) Old 01-29-2013, 08:13 AM
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It seems that all over this place (the board in general, not this thread) there is a lot of conflicting information on our diffs...

What exactly is the main difference between the base model & GT differentials? I do just have a V6, but I know I have an LSD that at least requires the name part numbers for fluid replacements and capacity.

Thanks and sorry to go slightly off topic!
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post #15 of 32 (permalink) Old 01-29-2013, 08:35 AM
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I don't think that diff will last if there are any shavings in there. It may just lock up completely on you while on the highway for instance. Doesn't sound safe. I'd as least pull the cover and check.

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post #16 of 32 (permalink) Old 01-29-2013, 09:41 AM
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Swapping an open rear with a posi rear is a non issue I don't know why anyone would think it is. The ONLY things you need to worry about are if the spline's are different where the axle's go in beyond that there is no difference, well unless the gear ratio is different that is.
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post #17 of 32 (permalink) Old 01-29-2013, 10:11 AM
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Thats rear diff is done. Start looking for a replacement. Should have checked the oil before hand. Common sense

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post #18 of 32 (permalink) Old 01-29-2013, 10:40 AM Thread Starter
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To answer everyone's questions I do have a v6 with a gt diffirential when I swapped out the rear subframe the new used one had the v8 LSD diff.

If I did damage it then the only way to know is to open up the diffirential from the back and removing the plate, so I assume by inspecting the teeth I would no if their bit off or doesn't rotate right.

Common sense did not work in my favor, did everything else right but the one little thing oil was not on my checklist, I thought I already had oil, when I received there was no sign or nothing.
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post #19 of 32 (permalink) Old 01-29-2013, 01:05 PM
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You want to inspect EVERY millimeter of those gears to see if they have ANY bluing which would indicate they were heated up and the metal is damaged/weakened. But unless you pull the diff out and completely take it apart and inspect every piece of it I wouldn't run it cause like I said before there's lots of little pieces that if they fail the rear end could/would lock up causing a loss of control and possibly a wreck. Its too important of a thing to not do it the 100% right way IMHO. Just be careful I'd hate to see you start a thread in a month titled "Spun out and wrecked my G8 into a school bus"
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post #20 of 32 (permalink) Old 01-29-2013, 01:46 PM
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The V6 rear gears are higher than the GT gears. I think it is 3.27 compared to the 2.92s. I guess he would be a little slower but get better mpg LOL.

I would agree with them. I would look for another diff. If you want another GT diff, I can try to call my brother and see if my old diff is still good and sell it to you. I even think it still has oil in it (PLEASE CHECK THOUGH, i didn't do the swap and it is just sitting in my garage).

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