Kizmo

Is the 3.07 gear ratio a good ratio to have if you plan on moderate perfromance upgrades, heads, cam, intake, headers, and roller rockers etc.?

Thanks

Pete K

This was the perfect gear for me in my 87 auto car :jester

CFI-EFI

How high is up??? It depends on the engine, and your wants and needs. A lot of guys with 2.59's, covet 3.07's. Mine came with 3.07's, and *I* want more. Every ratio, is a "good ratio"...for SOMEthings and SOME people.

RACE ON!!!

Kizmo

I just thinking about a decent street car with some back bone to it but also good at highway crusing speeds.

Pete K

I now have 3:33 gears in my car. It ET'd quicker(with 3:07) but the street manners are better (for me) with 3:33


[Modified by Pete K, 4:10 PM 2/18/2004]

Plasticman

With decent street tires, and the 3.07 plus the low gear of the 700-R4, I can fry the tires on launch, and in 1st to 2nd shift (87 Z-52). Any more gear, and the tires would be gone in no time. Now slicks at the track is a diff. matter.

Plasticman

CFI-EFI

What year ???
What engine ???
What transmission ???
What heads ???
What cam ???
Aw, nuts! Come to think of it... for you, 3.07s are perfect !!!

65Z01

With your LT1 you could use more gear but why not wait till you're finished with the engine to see if stocks are "good enough".

Lone Ranger

Anyone know if the 3.23 ring and pinion from an F-body rear end would fit a series 3 carrier for our cars? I'm guessing not, due to different configuration of the differentials.

Pete K

The only rear gears for a dana 36 I know of is richmond 3:55 and 3:75. F body gears won't work :auto:

tobijohn

:iagree: more or less. I believe the Dana 36 aftermarket gears are 3.54 and 3.73 ratios. If you already have 3.07s then it doesn't apply to you but there are two different types of aftermarket gears depending on whether you're rear end was originally a 2.xx or 3.xx series (something to do with different carriers?). I've also heard that there are OEM 3.33 gears that were offered for a year or two only (I think they might have been available in the 84) but they are as hard to find as hen's teeth...

vader86

3.07 is just fine, but with the LT1 you would probably like 3.54 or 3.73 better.

It is still a good ratio to have.

CFI-EFI

Late model F body = GM 10 bolt axle.
C4 = Dana axle.
= No intechangability of parts.
Dana 44 ICAs have a 3.33 ratio available. The 3.31s were offered for 36s in '84, only, as stated. They were offered as the "performance" ratio, and could only be ordered as a separate option, and only IF the Z51 handling option was also ordered. Very few cars got the 3.31s. Dana, and consequently, GM, have long since discontinued them. The 3.07s are the only, origional equipment, currently available, ratio, gears, that fit the 3 series Dana 36 case. A set of 3.31s DO turn up every now and then. Some aftermarket gears are made with a "thick" ring gear, to fit the 2 series cases. Just make sure what you are offered, fits what you have. Good luck, and...

RACE ON!!!

wildman738

my 1995 convertible LT1 came from factory with the G92 option and G44 3.07's and i love it. It is auto so the 3.07's really make a difference compared to some with 2.59.

i love my 3.07s just right for me but if you plan to drag maybe 3.54 will be what you need?

redcorvettedave

From my experience with my 94LT1 A4.....the 3.07 is the best gear for moderate performance up-grades.....my frist mod was 3.54s love them ...off the line in a street race could not punch it street tires spinned!! HAD TO LEARN HOW TO ROLL AND LAUNCH the LS1 guys ate my lunch....next mod PE exhaust loss just the right amount of low end torque cuold launch better but not perfect, slight spin, LS1 guys ate me up on the top end I could hang on there bumper almost for a 1/4 mile....next mod 2600 stall TC and PRObuilt transmission with trans-go shift kit ...launch like a bullit for only two launches... before I could get to the LS1 guys the dana 36 blew!!..I put back on the 3.07s.. to my surprise the performance was magic!!..I also took off the cats ...and started laucnhing off the line in my street tires with no spin...I can now punch it from a dead start and the thicker 3.07s in the dana 36 is holding up...now i can take full advantage of my 2600 stall torgue converter with no spin....I'm faster and more consistant off the line with more top-end engine power left than the 3.54s left......and I SMOKED AN LS1 CORVETTE OFF THE LINE AND HE WAS ON MY BUMPER FOR THE 1/4 MILE..IT'S ALL IN THE COMB :cheers:

tobijohn

I'm sorry Dave, end of the week and the brain isn't working too well. What does PE stand for? Thanks...

SHINOBI-X

theres some pretty bad vettes here that can run great times with the 2.59's! not that i'd say go backwards or anything.just sayin..... :cheers:


[Modified by SHINOBI-X, 6:52 AM 2/25/2004]

BookSmart

2.59 gears in my stock 86 snap my head into the headrest pretty good. That and when I launch I fing it hard to not break the tires loose. Even barks then at 20 sometimes.

As was stated above keep what you have and see if you are happy. If not go bigger.

O yeah that and I like seeing 28-30 MPG on those long trips :D

redcorvettedave

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QUOTE..[ sorry Dave, end of the week and the brain isn't working too well. What does PE stand for? Thanks...]-------------------------------------------

POWER EFFECTS CAT-BACK EXHAUST

ROME

I wouldn't consider my mods 'over thr top' or anything, yet I can still spin the tires from a roll in 1st & 2nd gear with 3.07's. No need for anything lower than that really. If you're running a warmed over engine and a Dana36, I would guess that anything beyond 3.07's and you'll be looking to replace the differential before long. If you go 3.55. or better I'd consider stepping up to a Dana 44.