I can't see the tag on the diff. With the aod cruising at 120 km per hour I see 2000 rpm in 4th or OD. My truck with 35" tires and 3:55 rear gears with a E4OD at 120 km per hour does 1800 rpm.
Check your door jamb sticker
http://www.coolcats.net/tech/general/axleinfo.html
Generally, from what I've seen, the Sports usually have a 7.5 rear with traction lock and 2.73's.
I would say you have either 2.73's or 3.08's. That is about the same RPM's as my car at 75mph, somewhere between 1800 or 2000rpm's. I have slightly taller tires then stock, and I am unsure which ratio I have, probably 2.73's, but the car does have the larger 10" drums and a towing package, so I will have to check on of these days.
Likely since those are the ONLY two ratios that were available...
Hey, they could have been swapped at some time down the road. I doubt you 'could tell which gear you have without watching a tach at a certain MPH. I'll just vote 2.73's since I can't be right by saying both.
I did the mark on the driveshaft and mark on the tire. 2 3/4 turn of the driveshaft to one turn of the tire. 2:73. Thanks guys.
you could of looked at the tag on the rear and see that it said something along the lines of 2L73
No diff tag.
well thats just wrong.....
Bettin' someone had to replace the Trac Loc and either forgot, or were too lazy to put the tag back on...:punchballs:
I am thinking that because the limited slip works really well. I have a 88 TC rear with 3:73 gears and the disc brake in my garage and I am wondering if it will be too much for the 351w. I may see if I can find a 3.08 8.8" or a 3.27 8.8" diff and swap the disk brakes over.
What size tires are you running or planning to run?
Depending on that, 3.73 may be fine, unless you drive a lot on the highway and have a c4 or c6. I think you'd be fine with an AOD or T5 though. Wish I had 3.73's in mine (have 3.55).
AOD+3.73 gears=~2400 rpm at 70 mph, at least that's what mine used to do. Now with the new converter mine runs about 2800 rpm at 70 mph because the non-lockup converter slips about 400rpm in OD. I still get about 23-24 mpg at 70mph though.
Hell with a O/D tranny even 4:30s ain't too much... 4.30 x .68(O/D) = 2.92 final drive ratio, that ain't nuthin'... Till the AOD tranny arrived in '80, grandma's LTD or Grand Marquis was running 3.08 gears and most of those trannys didn't even have a lockup converter...
Yeah. I am running the turbocoupe wheels and tires right now. I may stick with them or the 17" 93 cobra replicas in the future. I do alot of highway driving everyday to work. I was thinking maybe 3.08 max 3.27 but I am not sure. Right now at 120km per hour I am at 2000rpm. 3.08's will give me more pickup but the 3.73 may be too much for the highway. To bad there was not a way to overdrive the od in the aod. I know it can be done just not cheap.