I have an old fbody 10 bolt in my back yard that I forgot about. It has 15:41 on the gears, doesn't this translate to 3:23? I'm looking for 3:42s which are 12:41 arent they? Help!

------------------
91 Camaro RS - Black with red tweed - t-tops - 700 watt sound system - 14x3 open element - 80 Series Flowmaster - muffler turndowns - Poly transmission mount- BeCool radiator-
Coming soon: 4th gen rearend and chrome 10 spoke SS wheels

88 TransAm GTA - WS6 - red with grey cloth - K&N Filters - TPIS Airfoil - Wonder Bar - Future Restoration

 

I assume you mean the number of teeth on the gears? If so divide smaller number into bigger number for ratio hence yielding a 2.73 ratio for 15:41

 

Ah yeah.....I feel stupid now. Errr.

------------------
91 Camaro RS - Black with red tweed - t-tops - 700 watt sound system - 14x3 open element - 80 Series Flowmaster - muffler turndowns - Poly transmission mount- BeCool radiator-
Coming soon: 4th gen rearend and chrome 10 spoke SS wheels

88 TransAm GTA - WS6 - red with grey cloth - K&N Filters - TPIS Airfoil - Wonder Bar - Future Restoration

 

12:41 would be 3.23s.

12.7:41 will be 3.42s.

 

12:41 is 3.42.

I've never seen 12.7 teeth on a gear.

Well, now that I think about it, there was about .7 left of one tooth once, but I wouldn't recommend that for establishing a gear ratio.

------------------
82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R4, 2300 stall TC. Ported World 305 heads, Crane PowerMax 2050 cam. ZZ3/4 intake, oil pump, pan & baffle. Accel HEI SuperCoil & module. Hooker 2055 headers, 3" Catco cat & 3" catback w/dual-opposite Flowmaster 80. 2.93 limited slip. Spohn SFCs waiting to be installed. AMSOIL syn lubes bumper-to-bumper. Daily year-round driver. Best ET, speed TBD...
57 Bel Air, my 1st car. '66 396, 9.7:1 forged TRWs, Weiand Action+, Holley 750VS w/4150 conversion, GK 270 cam, Magnum rockers, Jacobs Omnipack, 1-3/4" Hedders & 3" Warlocks, TH400 w/TCI Sat Night Special conv & Trans-Scat shift kit, MegaShifter, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Idles smooth @ 700 RPM in D. Best 15.02/95.06 @ 5800' Bandimere (corrected 13.93/102.4 @ sea level).

 

OK, I just ran the numbers again. Here is what my calculator tells me:

41 divided by 3.23 = 12.693498 or 12.7

41 divided by 3.42 = 11.988304 or 12 again!

 

Sitting Bull: Gears have to have integer (whole numbers) numbers of teeth. Put away your calculator before you hurt someone with it.

41:15 = 2.73
40:13 = 3.08
42:13 = 3.23
41:12 = 3.42
41:11 = 3.73
41:10 = 4.10
41:09 = 4.56

 

I just dropped it on my toe ... @#$*^&!!!

 

I take it you didn't have steel toe boots on?

The rear I just took out of my car has a fractional number of teeth. It has like 39.7:13 (One tooth is all the way gone, and 2 of the others are about 1/3 or more gone, I plan to post pics)

------------------
Working on:
'84 Z28 LG4 305 with 209,000 original miles!
Dual electric fans (from a formula).
9 bolt posi disc rear with 3.27 gears.
145 MPH IROC Speedo
430 HP 350 (ZZ430) Coming soon! (Building it myself, so I don't get those AWESOME valve covers!)

Starting to look like the Kicker poster child!

ASE Certified Master Tech
+ L1 Advanced Engine Performance
+ X1 Undercar Specialist

And....A sig. that's getting way too long!

 

Nah, sittin' here in my undies at the keyboard. I can get away with it at this time of night