[Tommy R]

Hey you all,

I'm looking for information on 4th Gen F-bodies. Specifically, I'm interested in the diff options, gearing differences (rear end and tranny), 1LE vs. base model specs, and any other differences from model year to model year.

For example, I know the '93s are speed density, not mass air. Are there any differences there from a performance or maintenance standpoint? The '93s also had a slightly different T-56 tranny, as I understand it. Were '93 and '94 models not available with 3.42 rear gears? Would a 150 mph speedo indicate that the car has 3.42's? No governor? I remember my old roommate's '94 T/A didn't have the "GT" package and as a result had the 115mph speedo, governor, and maybe even 3.23 gears (instead of 3.42s).

I know in '96 they went OBD-II with dual cats. They're also rated at an insignificant 10 hp more than the '93-'95 models. Of course, in '98 the LS1 came out with much more power. However, the LT1s are obviously still very compeitive in F-Stock, despite the power deficit, iron block, and smaller front brakes. Any particular reason for this? Or are the right people just not running LS1's? (IMG:http://www.frrax.com/rrforum/style_emoticons/default/unsure.gif)

So, needless to say, I'm intersted in LT1 vs. LS1 differences, too. But, I'll likely stay with the cheaper candidate, i.e. the LT1.

I should point out that I'd mainly be interested in F-Stock, so update/backdate concerns are of less importance. I'm not sure if/when I'd move to ESP.

Thanks in advance,
Tommy

[Soma07]

Oh, and the 2nd through 6th gears in the '93 are the same as in the '94-97 transmissions. It's just the first gear that's different.

Actually they're all different except 4th (which is still 1:1).

I'm too lazy to look them up but the 93 M29 tranny actually has the same ratios as the Z06 transmission except for 5th and 6th.

IMO the differences between a 93 and a 94-97 aren't worth mentioning. Technically the MAF system is better but i've driven both and couldn't tell any difference. At least with a 93 you get better transmisison ratios.

Tommy,

Welcome, time to ditch that Bimmer for something with torque (IMG:http://www.frrax.com/rrforum/style_emoticons/default/biggrin.gif)

To check the rearend ratio just look at the option codes which are on a sticker in the glovebox.

GU2= 2.73
GU5=3.23
GU6=3.42

However the 2.73 cars are pretty rare so there is ~90% chance any 93 six speed car you find will have 3.23's (which is good because then you can switch them for 3.42's and stay legal in ESP).

If you have any questions about 93's vs. 94+ feel free to e-mail me (or ask here). I think I have all the differences memorized by now (IMG:http://www.frrax.com/rrforum/style_emoticons/default/smile.gif)