Noob Differential question

I have a 2008 PreRunner TSS V6. I spend 99.9% of my time on pavement, and sometimes drive accross fields, on sand, etc. I have not gotten stuck yet, and I dont want to. After reading a lot of information on this site, I came to the conclusion that my truck has an open differential, since it does not say "LSD OIL ONLY" on the differential.

I went to my local 4X4 place and ordered a detroit TrueTrac. The guy called me back the next day and told me that they dont make one that will fit my truck, something to the effect that my truck has a 12 bolt diff and he can only get 10 bolt...sounds like BS since lots of you on this site have truetracs.

I was telling a guy at work about this, and he said he can't believe toyota would sell a truck with an open diff, and that we should go test it out. We went to the parking lot, put a chain around the fifth wheel of his F250 and put the other around my ball hitch. When I gassed it, both of my tires started screaming. He said "see, you get positive traction w/ both wheels" Does this mean I dont have an open diff? Would I get no benefit from the truetrac?

 

sounds like you have something to me.

 

Anybody know of a site where I can punch in some numbers and find out exactly what kind of diff i have?

 

www.toyotadifferentials.com.

Sorry, I couldn't resist.....

 

If only it were that easy LOL

 

when i'm running "open" and mash the gas on pavement, i get spin off both wheels. sometimes even an open diff will spin both tires going in a straight line. i was thinking the trucks came standard (even the reg cab no option fleet vehicles came with LSD standard from 08+) i know the stability system has something to do with it too. you may have a "break actuated LSD" it's electronic controlled through the brakes...if a wheel starts to slip, the truck will apply the brake on that wheel forcing the other to spin. i don't know how to tell you to check which it might be. i know there is a true LSD in some of these trucks (friction plates in the 3rd) all these damn safety nannys they put on em anymore confuse me.

there is a way to tell...jack up the rear of the truck (both tires), put it in nuetral and spin a wheel, if the other wheel spins the opposite direction, it's an open diff. or find a slight off-camber in the grass and give it a little juice. if it's open, your uphill tire will spin by itself.

sorry i don't have better info. i have the 8" open rear with e-locker.

 

Thanks for the advice...I'll jack up the rear end on my next day off and see how it goes from there.