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Old 02-22-2002, 04:06 AM   #1
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2L73 on differential tag-does this mean 2.73 rear gears?

Just wondering.
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Old 02-22-2002, 04:11 AM   #2
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Yep. And if I'm not mistaken I think that "L" in there means it's traction lock.
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Old 02-22-2002, 04:40 AM   #3
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Those are indeed 2.73's. Get rid of them!!! hahaha
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Old 02-22-2002, 04:50 AM   #4
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Damn.....

That is what I figured. That sucks. Best replacement ratio would be what for a daily driver?
What all is involved when changing gears on these cars?
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Old 02-22-2002, 05:35 AM   #5
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It depends. Stick or Auto? They say 3.55 for a 5 spd, 3.73 for an Auto, but my last stang had 3.73s and this one has 3.55, both 5 speed cars, and I can't tell any difference. Its up to you.
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Old 02-22-2002, 06:57 PM   #6
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Its an stick.

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Old 02-22-2002, 07:10 PM   #7
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Im ready to drop mine for 3.55s ..you'll have tons of people say dont fear the gear or whatever and put 4.10s in it! But thats a tad too much, for what it sounds like your looking for 3.55s should be right up your alley with a 5-speed
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Old 02-22-2002, 07:16 PM   #8
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Bah, 3.73s. 3.55s are nice if you've got a mild power adder car, maybe, but not if you're keeping it n/a.

FWIW, I've got 4.10s in my car and I love 'em. Double pumper carb and still 22 mpg/hwy.
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Old 02-22-2002, 07:18 PM   #9
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Quote:
Originally posted by bonk5327
Im ready to drop mine for 3.55s ..you'll have tons of people say dont fear the gear or whatever and put 4.10s in it! But thats a tad too much, for what it sounds like your looking for 3.55s should be right up your alley with a 5-speed
3:55's SUCK!! trust me..



I'd go with either 4:10's or 4:30's just do a search on here

Last edited by NaturalAspired; 02-22-2002 at 07:20 PM.
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Old 02-22-2002, 08:10 PM   #10
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Does anyone ever take into consideration what future mods are planned for the car before saying "3:55's suck"?

So.....let's say the car in question is going to make tons of torque but very little power up top when completed. Would you still recommend 4:30's? And what? Forget keeping it in its powerband? EVEN on a daily driver?

I like shifting, but not that much.


Yeah right, "One Size Fits All"........NOT.
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Old 02-22-2002, 08:30 PM   #11
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Quote:
Originally posted by Anile8em
So.....let's say the car in question is going to make tons of torque but very little power up top when completed.

Yeah thats right, I forgot MOST people build motors with "very" little power up top


give me a f***ing break
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Old 02-22-2002, 09:37 PM   #12
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98LS1Z28:

Have you considered the option of finding an 87-88 T-bird Turbo Coupe to pirate the rear-end from, since the automatic cars come with 3:73's and the 5spd cars come with 3:55's, with the added bonus of disc rear brakes?
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Old 02-23-2002, 09:17 AM   #13
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I've got 3.73, and I love them. I would consider going with 4.10's in the future, only becuase the 3.73 are so effortless to drive.

This is on a mostly stock N/A car.
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Old 02-23-2002, 07:42 PM   #14
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Quote:
Originally posted by NaturalAspired


3:55's SUCK!! trust me..



I'd go with either 4:10's or 4:30's just do a search on here
Thats great guy. I don't know about you, but I am in my car in stop and go driving in southern california about 85-90% of the cars life. I'm not even close to considering 4.30s for my car. This isnt a weekend drag car. My friends 88 with 3.73s has a short enough first gear for my liking.
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Old 11-05-2005, 07:47 PM   #15
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im going a little off topic but i have a rear defferential off of a 1996 gt. my car is a 1988 gt convertible, would i be able to put the 96 defferential in as a cheap upgrade because my traction lock if pretty much shot. i think i have 2.73 gears in there right now but the tag says 1L73. the 96 differential i belive says 3L24 so that would be a 3.24 right? would i be able to change the 4 lug drum setup to ne 96 differential? thanks
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Old 11-05-2005, 10:02 PM   #16
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Quote:
Originally Posted by Bonk5327
Thats great guy. I don't know about you, but I am in my car in stop and go driving in southern california about 85-90% of the cars life. I'm not even close to considering 4.30s for my car. This isnt a weekend drag car. My friends 88 with 3.73s has a short enough first gear for my liking.

dude, go get a saturn. (just kidding)

yeah I hear ya, with my 4.30's in and a T5z tranny ; First gear is just for show and play.

but no joke, if it was like that I'd just leave the gears stock or go with the 3.55's..sorry for acting like a ****.
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Old 11-06-2005, 06:42 AM   #17
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Related to the tag codes, anybody here knows of a link or good book with the information on how to decode them? Thanks.
Anybody with the 3.90 gears alternate installed?
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Old 11-06-2005, 10:36 AM   #18
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Wow look at the bad gas mileage bandwagon in here. 2.73 rear gears are the best for that car. You don't need to rev the piss out of it to get around, is it a Honda? If it's not fast enough, get more power out of the engine, don't put a ******* ricer bandaid on it. Not to mention you don't have to shift as much with higher gears.
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Old 11-06-2005, 10:43 AM   #19
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You can find the axle code in two places, the tag on the differential and on the vehicle information sticker on the driver's side door.

This list is VERY generic. Ford doesn't distinguish between 7.5" and 8.8" rear ends on the door sticker. Of course its fairly obvious looking at the differential cover as to what axle you have. Of course none of these codes mean squat if the gears have ever been swapped out in the car.

Door sticker codes:
G 2.26:1 open ('80-81 255 V8)
B 2.47:1 open ('79 V8)
8 2.73:1 open
Y 3.08:1 open
F 3.45:1 open
M 2.73:1 L/S
Z 3.08:1 L/S
R 3.45:1 L/S (7.5" only)
E 3.27:1 L/S
W 3.73:1 L/S (SVO 7.5" or Turbo Coupe 8.8")

I only listed the codes you're likely to encounter in a Mustang. Remember that in the early 80s there was the 2nd fuel crisis here, hence the extremely tall ratios behind the 255 V8 turd.

Differential tags should have an "L" between the numerals if it has a limited slip.
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Old 11-06-2005, 10:47 AM   #20
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Quote:
Originally Posted by Ray III
Wow look at the bad gas mileage bandwagon in here. 2.73 rear gears are the best for that car. You don't need to rev the piss out of it to get around, is it a Honda? If it's not fast enough, get more power out of the engine, don't put a ******* ricer bandaid on it. Not to mention you don't have to shift as much with higher gears.
If you put 3.55's or a 3.73, or even a 4.10 you tend to get better gas mileage due to the simple fact that the car doesnt have to struggle to get the car moving. It has a LOT more leverage to start moving the car with a lower gear ratio, which results in less gas used to get going.

I dont see how you think putting a gear in a car = bad gas mileage. do you even have any experience as to what you are talking about?

I have had a 93 GT with 4.10's, 3.73's, a 93 lx with 3.73's and my current 93 gt with 3.73's and every one of them has got over 22 mpg even after the gear change.
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Old 11-06-2005, 11:01 AM   #21
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Quote:
Originally Posted by Royal_93_GT
If you put 3.55's or a 3.73, or even a 4.10 you tend to get better gas mileage due to the simple fact that the car doesnt have to struggle to get the car moving. It has a LOT more leverage to start moving the car with a lower gear ratio, which results in less gas used to get going.

I dont see how you think putting a gear in a car = bad gas mileage. do you even have any experience as to what you are talking about?

I have had a 93 GT with 4.10's, 3.73's, a 93 lx with 3.73's and my current 93 gt with 3.73's and every one of them has got over 22 mpg even after the gear change.
In the city that is true.

In reality most of us put more miles on the car when we are crossing distance fast. When you are cruising at 80 MPH for three hours, you damn well do not want 3.73's in that car.

The same principle applies anywhere that you spend more time at a steady speed than you do accelerating.
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Old 11-06-2005, 11:12 AM   #22
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Thanks for the list Bart99GT.
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Old 11-06-2005, 12:07 PM   #23
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FWIW to ray and everyone else. I achieved the best milelage with my 86 with 3.27 gears. It got a couple tenths shy of 30 (29.6) on three seperate occasions doing 80-90 for three hours straight...The 2.73's got about 26 in the same scenario.
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Old 11-06-2005, 04:09 PM   #24
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i have 3.90s and LOVE them... my car is na and is a street car but i go to the track a few times a year. i went from 2.73 to 3.55 then to the 3.90s. for me the few hundered rpm difference between the 3.90s and the 4.10s was the reason i got the 3.90s
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Old 11-06-2005, 04:34 PM   #25
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i love my 3.73's, big differance over the junk ass 2.73's.
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Old 11-06-2005, 05:12 PM   #26
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Quote:
Originally Posted by BadAss88GT
It depends. Stick or Auto? They say 3.55 for a 5 spd, 3.73 for an Auto, but my last stang had 3.73s and this one has 3.55, both 5 speed cars, and I can't tell any difference. Its up to you.


Wow, this thread is back from the dead! FWIW, I switched to 4.10s, best thing I ever did.
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Old 11-09-2005, 12:22 AM   #27
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Quote:
Originally Posted by Joel5.0
Related to the tag codes, anybody here knows of a link or good book with the information on how to decode them?
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