ariigh well im looking for a good posi unit and some 3.73 gears to put in my 92 camaro with 28 spline axels....can someone point me in the right direction. its going into a 3.1 V6

 

Powertrax makes a unit that works with the 28 spline axles. It is a gear-type rear though, not a clutch type so be prepared for some noise when you're turning. The one I had in my 92 RS was perfect until we started dumping on the power

 

Did you break the Powertrax unit?

 

Yeah, but technically it wasn't me

It happened after I sold it to my brother. I think he said that one of the springs snapped, but I could be mistaken. It was covered under warranty, but I think they are still dealing with the claim. For now, the stock unit is back in so he can drive it.

 

Since it's a V6 the 28 spline axles in the rear should hold up fine (unless you get a V8, then I reccomend Moser axles) so you just need a posi unit and gears. There are a few different types out there. If you're looking for cheap, SLP has the Torsen take-out posi unit for ~$100, but it isn't the strongest be far. PowerTrax makes a nice locker (The No-Slip I think). Auburn also has lockers and regular posi units. Some people say they're not very good, but I can't say since I haven't used them. Eaton makes an excellent posi unit, but it is a little pricey, on the other hand it's completely rebuildable. As for gears, any big name gear manufactuer will be fine. Richmonds are known to whine, but they're stronger and better for drag racing apps. They're not a loud whine, but some people are annoyed by it, apparently their exhaust isn't loud enough to cover it up . GM makes gear sets that are good quality and don't whine, Motive and US Gear also make good gears. Hopefully that gives you a start, I know I didn't list all your options so let us know what direction you're thinking and we can give you an idea.

 

Is this the $100 posi unit you speak of??? They are not very clear on the site. Only one even close to $100, why i ask.

http://www.slponline.com/view_produc...TNUMBER=64501T



Matt

 

Yes, that's the one I was talking about. It's a good posi, but if you're running some decent numbers it might not last long. Of course whether you're getting traction or not plays a big part in how long it lasts...

 

well ive only got a v6 that runs pretty quick but nothing serious yet....would the slp work for awhile with my setup. right now i have a chip, pulleys, exhauste and pf&e headers and im gonna have shortly 3.73 gears aluminum driveshaft and 5speed swap...it would be nice to have 2 wheels spinning when im stuck in the snow this winter lol

 

what about a used Eaton unit....going pretty cheap on ebay right now, would this one work?

http://cgi.ebay.com/ebaymotors/ws/eB...tem=2442157092

 

going cheap??? check back on it in 4 days, 23 hours and 58 mins.

I dought it will go cheap.

Id say that $100 unit is nice for a V6 28 spline posi. Once you went above and beyond what the V6 can do, you would want to switch axels anyways and would need a new posi unit.

Just a tip for ya [One thing with a posi is never run your cheap-o spare tire. To many of them have gone early from a flat tire and a trip with odd size wheel on.]

Really glad you started this thread though.

Matt

 

The Zexel-Torsen will be fine behind a V6. That Eaton one will end up going for more than you want to spend since it's rebuildable. I'm guessing you've got a good shop lined up to do the gear install right?

 

i may just have to get the SLP, seeing as its pretty cheap and everyone seems to think it will be fine in my ride. actually im gonna do the install at my school, we already tore my rear end apart once to see what all was in it(and for the experince) so ill just take it there and do it, free labor =) ok so we have a pretty good idea for a posi, now what about some gears....i dont know much about them or what(if anythign) i would have to also install with them...im thinking just a little upgrade, say 3.73s instead of my 3.42s..any help would be apprecieated

 

Hey man, why I said thanks for the post. I had no idea I could get a posi so cheap. Next spare $100 and I'm gonna get one for my 6.

Myself Id like to go 4.10 as with my T5 I can deal with the RPM's and drive mostly around town. The highways are storage for orange barrels.

But I do not have access to all the tools and help so I will most liley just stick with my stock stuff. Unless the pinion must come out to put it in. Was hoping it would just be an "easy" swap. The ring gear bolts solid, its the pinion that you gotta adjust with crush washers or something???

Matt

 

For the gear ratio, it depends on what your powerband is and how high you like to spin your motor. Final overdrive ratio is also important, if it's low you can have high gears and still get acceptable mileage and keep the rpms low on the highway. I have a little spreadsheet I made up to figure the different rpms/speed depending on the rear gears. It's on my webspace:

http://mypage.iu.edu/~kyafoley/speed...-speedcalc.xls

If you have any ?'s about it let me know.

 

hey no problem, im glad i found one pretty cheap as well....and since we have v6s we can go cheap and still get the perfomance we want =) and they say v6s arent good haha. i have access to some 4.10s at my school but i do a lot of driving around and that would rev my engine up way to much, like tonight im going to cincinatti and i live in evansville...basically im gonna be driving 1000 miles this weekend. so a minor gear change is all i want to do...ill have to check out that spreadsheet and see if it makes any sense to me if not ill get back to ya, time to go order that posi, its pay day

 

ok.. heres a question...

whats the internal gear ratios of a 91 700R4.... the one behind my L03 if it makes a diff...


im about to do a search, but if someone just knows, it would not only help me to post them here, but anyone else that has a auto and loads that spreadsheet

 

Im not sure if the RPM's would matter much. These well my little 2.8 loves them RPM's it revs so fast.

I conside our/my 2.8 very much like a bike. Its kind of like riding a 600. Its as slow as you wanna be but if you rev them gears out, it can get up and go.

Now gas mileage might varry but I wouldnt be afraid to crus at 3500-4000 all day.


Matt

 

700r4 Gear Ratios

1st - 3.06
2nd - 1.63
3rd - 1.0
4th - .70

 

I had a Torsen in my 99SS with 495RWHP and it outlasted the clutch. I ran 1.6-1.8 6-' times with 4.10 gears and never had a problem with it.

 

i'm runnin a zexel torsen with my modded v6. no problems, i've run slicks on the car too, it works great. i pull 2.12 60' on street tires at the track. i've got 4.10 gears on the ZT unit also...the only thing is...you gotta either buy the split paddle to go inside the posi (to keep the axles out) or you gotta grind some teeth down a little on the ring gear. don't worry, i've heard of this being done before and it is what i did on mine and i have had no problems, you don't grind the teeth off, just down so that the paddle will slide past.

 

I have a zexel torsion posi going in behind my 350. I will probably be running nitrous also. With your v6 you should do fine with a zexel posi. I know some guys that beat the crap out of theres and there good. Its the same posi that comes in 4th gens stock. I know a guy running 11's in a 02 TA with the stock gears and posi. I think you will be ok with it.