View Full Version : ok confusion question(im confused)

01-18-2005, 02:50 PM
ok on my 84 cougar 5.0 the door tag says its a 3.08 rear end. ok no biggie but one nice day when i did a nice burnout i had 2 sets of tracks!! :evilgrin: but the door tag says its a 3.08 open rear end. ok so what is going on here ive looked at the tech section but hasent givin me mutch help. so i need to know if i have a locking rear or not or was it just a by chance i got dual wheel peel?

update: just put the rear end in the air and it appears its the 3.08 7.5" rear end but its a locking rear end. now my question this time is how many 84 5.0 gs cougars from the facroty are like this? is this a rare rear end?

01-18-2005, 03:07 PM
What makes you think it's a locking rear exactly? Locking (traction-lok) rears will spin both tires in the same direction when you have 'em up in the air (spinning them by hand, not with the car in drive). It's possible, a fluke, that you can spin both tires with an open rear, my '84 Cougar did it once or twice as well.

01-18-2005, 03:11 PM
well i was only able to pick up one side and i know if its a open rear end it will just spin but when i spun it i herd a clicking noise. whitch leads me to belive that it could be a locking rear end. but the rear end tag is really rusted.

01-18-2005, 03:15 PM
I dunno about clicking. You'll have to get both rear wheels up to do that test. I was taking an 8.8 out for my car and the tag was so rusted it snapped off but I was able to read it with the help from some sandpaper.

01-18-2005, 03:31 PM
According to the '84 shop manual you can have either a Integral (7.5) or a Traction-Lok (7.5) rear.
The AX codes for a 3.08 are Y for conventional rear and Z for lock.

01-18-2005, 03:33 PM
He stated his door tag indicates an open rear but has evidence that it may be otherwise. I'm doubting that it is, though, because my '84 did some of the same things, but was an open rear.

01-18-2005, 04:42 PM
it could have the towing package, which i think included the 3.08 rear, t-lock, i think 10" drums and a different alternator

01-18-2005, 05:09 PM
I have the towing option on my car. It has 10' drums quad shocks and an open rear end

01-18-2005, 05:14 PM
mine is like a normal set up 2 shocks controlling arms and all that. the norm. so why would it be locking? and not open?

01-18-2005, 06:53 PM
who cares? dont complain

01-18-2005, 06:59 PM
not complaning just whant to make sure i understand everything and if i do have track lock ill be jumpin up and down for joy cuz i can keep this rear end in it and focus on the motor and trans.

01-18-2005, 07:05 PM
Locking or not, it's still a 7.5 and they can break more easily than an 8.8 I'd be willing to bet that it's not locking. A locking 7.5 is a rare thing to find and I can't see any reason why the car would have one when the door tag says otherwise.

01-18-2005, 07:12 PM
just like my car, ive spun two tires, its possible someone swapped in an early TC rear, but why would they?

focus on the motor and trans anyways, youre not going to break a 7.5 on anything other than slicks, or really sticky street tires and a good bit of power, which i dont think youre packing either at the moment

01-18-2005, 07:17 PM
Hey mf-er... I broke my 7.5 on a stock 5.0 and just a hair over 100k so it can happen.

Remember? (http://www.foxtbirdcougarforums.com/showthread.php?t=1207)

01-18-2005, 07:21 PM
no, i dont remember, and no, you didnt break it

so back down!


01-18-2005, 08:59 PM
well i have the old stock 5.0 for now so im gonna keep the rear end and all but it does help that it might be a locking one. so i don't think its gonna break with 61000 on it well for now its gonna be somewhat stock but i whanna up the power a little and definatly fix the slipping tranny.

01-18-2005, 09:22 PM
ok now idk if i have the"quad" shock set up or not. it kinda looks like a 4 link set up. but not the ones u see on offroad vehicles. kinda like the rear ends on the 87 88 cougars. now does anyone have a pic of what the quad set up is?

01-18-2005, 09:33 PM
now does anyone have a pic of what the quad set up is?
It should look like you have 2 sets of shocks attached to the axle. One positioned vertically, and one horizontal (the quad shock).

01-19-2005, 01:33 AM
All fox rears are four-link. Quads would have shocks going horizontal, almost. I don't even think quads were around in 1984.

01-19-2005, 02:23 AM
The main shock would run from the axle up and mount in through the trunk, the quad shock would be horizontal from the axle to a mount beside the fuel tank on the frame rail (like has been said already) and I dont think it was used till '86 on tbirds/cougars though i could be wrong.

As far as your trac lock, my car would/will spin both rear tires on gravel, dirt, snow, most of the time (wont spin on pavement although I havnt tried hard due to the high probability of me gathering my tranny off the road and pushing my car home afterwards :wtf: ) but my car has an open diff, I dont know why it does this but it does, maybe because I dont have enough power to twist the diff :disappoin

01-19-2005, 08:54 AM
For our cars the quad shocks were first used in 1983 on the Turbo Coupe. Since that model was a late run during the '83 model year (which itself was truncated significantly), it is assumed that from late 1983-on, all Cougar/T-Bird rear frame rails *should* have the holes to accept the quad shock brackets. I know for certain that my old '84 did. The first Cougar to have them from the factory would be the '84 XR7.

01-19-2005, 09:04 AM
This thread got me wondering just what kinda rear end I have in my XR-7 so i went outside and checked the code on the door, and it read "R" which is 3.45 Locking according to the COOL CATS site.. when I scrolled down on the page the information about the XR7's said that they had the 3.08 gears. Eric, waddup with that? Is that a type-o on your end or was this another thing they changed when they imported it to Canada?

01-19-2005, 09:45 AM
This is called "one hand not talking to the other"...most rear axle information from our era is convoluted at best. It makes more sense that a 4-cyl. turbo car would have a higher gear ratio. I think 3.08 were standard but most people opted for the taller gear. Either that, or the info was wrong from the start. The axle code on the door tag will always be more correct.

01-19-2005, 11:01 AM
Perhaps it's beacuse your car's a 5-speed, Alex. Don't the manual tranny turbo cars get higher gears? (i.e. 87-88 TC's are 3.55 Auto and 3.73 Stick?)

01-20-2005, 02:37 AM
Open rear ends will spin both tires if the loading on each tire is equal while under power.

01-20-2005, 07:46 AM
Perhaps it's beacuse your car's a 5-speed, Alex.

Well I just took a look at an XR-7 brochure I had, and on the back cover it has the It says the axle ratio is 3.45 for both the automatics and 5-speed.

01-20-2005, 12:16 PM
3.55 stick, 3.73 auto

01-20-2005, 12:40 PM
I realized the other day that I had those two backwards.

I suck. I am not t3h win.

01-20-2005, 01:52 PM
ok now that the car is in the air i did the test and it is a open rear end. sorry for the confusion. thanx for helping me out everyone!

01-31-2005, 01:44 AM
The 7.5 diff. under my 87' is a trac-lok.I always have two wheel peel. Myaxle tag code is as follows: v493B 2L73 75 6L25
the "2L73" part means it's a 2.73 ratio locking diff. hence the "L"
and the "75" means the diff. size.
Got my info from my mustang technical refrence book.I highly recomend this book Even know we have thunderbirds, most of the info can be applied to our cars as well.