Posi in reverse?

BobbleSmitty · Post by **BobbleSmitty** » Fri Mar 30, 2007 10:05 am

Hey guys, today while moving cars around in the driveway, I backed my truck in and I punched the gas a little to see if I could chirp the tires. It layed a small 2 foot burnout with both of my tires. I know that I don't have the G80 locker, but why would they both lock up and spin while in reverse and not in drive?

20Blazer00 · Post by **20Blazer00** » Fri Mar 30, 2007 10:34 am

Better take a closer look at the differential, make sure nothing is weird inside. Check for external identification to be positive that you don't have a G80 installed. It would not be the first time mistakes were made in the assembly line/manufacturing process. If that does not yield any clues then you might have to pop for a gasket and gear lube to find out.....

BobbleSmitty · Post by **BobbleSmitty** » Fri Mar 30, 2007 2:04 pm

Well I know it doesn't do it in Drive, it only spins the passenger side. And I'm for certain that it doesn't have a locker. I'm pretty sure there's nothing wrong with it, I just found it to be interesting that it did that.

Post by **Walt** » Fri Mar 30, 2007 8:24 pm

My 2wd Sonoma did that as well. It would burn the hide off one tire in forward, but would spin both in reverse.

BobbleSmitty · Post by **BobbleSmitty** » Sat Mar 31, 2007 5:13 am

I was thinking about this for a while yesterday. The only logical reasoning I could come up with was that the tow hooks are on the front. So when you would use them to pull something, you would have to be in reverse, therefore it would maximize your traction with both of the tires spinning.

Post by **HenryJ** » Sat Mar 31, 2007 5:38 am

The hooks are in front to pull you, not for pulling others.
The gears (Ring and pinion) are not designed to be loaded on the back side.
If you must pull something use the hitch to pull evenly from the rear.

Snoman002 · Post by **Snoman002** » Sat Mar 31, 2007 5:54 am

My guess would be weight transfer.

When going foreward the rears get more traction, when one wheel starts to spin the diff takes over and spins the one, since there is alot of traction the other tire can't spin because it is getting very little power. On the other hand, when in reverse there is no (actually reverse) weight transfer so it takes very little power to spin the wheels, because of this, even if one wheel starts to break loose there is still enough power going to the other one to spin that one too.