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Rear gear

Posted By: 69suprbee

Rear gear - 05/08/13 04:20 AM

I have a 69 super bee 383 727.motor has a mild build.it has 3.23 open rear.i am going to put in a sure grip and go taller on gear.i do a little hiway driving but want more low end.thinking 3.55 or 3.73.anybody with experience going from 3.23 to either of these?3.55 enough of a difference?thanks for any opinions.david
Posted By: 340SHORTY

Re: Rear gear - 05/08/13 04:29 AM

what size are your rear tires.
Posted By: 69suprbee

Re: Rear gear - 05/08/13 04:38 AM

Sorry I left that out.275 15 60,a little over 27 tall on tear.tit also has a 280 h comp cams.that may be to much.its a little doggie on launch.727 shifts very well just rebuilt. Nice firm shifts motor runs well just not a lot of low end launch.any thoughts.?
Posted By: 340SHORTY

Re: Rear gear - 05/08/13 10:50 AM

3.23s to 3.55s isnt really noticeable. 3.73s would be better but they are not available for all 3 cases IIRC. I like my 3.91s and would love to go to 4.30s but I have a OD 833 which helps a lot..
Posted By: Cab_Burge

Re: Rear gear - 05/08/13 06:21 PM

Is this a automatic or stick shift tranny? If stick the no easy help by me unless you have acess to a 3.09 low gear tranny or a O.D. 833 . If your running a 727 think about changing the first gear ratio for more low end grunt I've done that on several BB cars, both street and strip and strip only
Posted By: RapidRobert

Re: Rear gear - 05/08/13 09:25 PM

(1) 3.91 (2) swap in a 451 . Exhaust/brackets etc all will change over
Posted By: forphorty

Re: Rear gear - 05/09/13 12:10 AM

If you are currently running a stock converter, a converter change will probably make more differance than a gear change. A 280 cammed 383 would probably like a 3500ish 9.5 or 10 inch.
Posted By: Twostick

Re: Rear gear - 05/09/13 01:05 AM

Quote:

If you are currently running a stock converter, a converter change will probably make more differance than a gear change. A 280 cammed 383 would probably like a 3500ish 9.5 or 10 inch.





Kevin
Posted By: 69suprbee

Re: Rear gear - 05/09/13 01:29 AM

Thanks for input everyone.i went ahead and ord a truetrac unit and some Yukon 3.73 gears.i will let you know how it does in the car.david
Posted By: Dcuda69

Re: Rear gear - 05/09/13 02:43 AM

I have 3:73's in my B'cuda with 245/60-15's. I switched from the 3:23's that were in it while it had a 383/4spd. Seems like the perfect gear to me. Gives good low end grunt but ain't spinning the crap outta it at highway speeds....very drivable!! It now has a 470" in it(still 4spd) so it's lots of fun and still very highway friendly
Posted By: skicker

Re: Rear gear - 05/09/13 12:48 PM

My 383 in my 70 Satellite is also a little lazy off the bottom. I think maybe just a bit too much cam in mine. I run 3.23's and have 275-60-17 rear tires. They measure right at 30". Last spring I put 3.91's in and ran them for a month or so. it helped it turn on sooner but it was exactly the same at initial start. I know it needs a converter, that would be the correct fix, but I am going to stay with the 1800 anyway. It runs pretty good from 2800 to 5500 or so.

Attached picture 7699095-7411915468_118a2a11c5_z.jpg
Posted By: 69suprbee

Re: Rear gear - 05/09/13 06:44 PM

Quote:

My 383 in my 70 Satellite is also a little lazy off the bottom. I think maybe just a bit too much cam in mine. I run 3.23's and have 275-60-17 rear tires. They measure right at 30". Last spring I put 3.91's in and ran them for a month or so. it helped it turn on sooner but it was exactly the same at initial start. I know it needs a converter, that would be the correct fix, but I am going to stay with the 1800 anyway. It runs pretty good from 2800 to 5500 or so.

sounds familiar.the bee has a 2000 stall in it.i am getting ready to put headers on it and upgrade the carb to a 750 cfm along with the posi and the 3.73.i hope its a different car.not that its bad now,just want to be able to burn both tires until i let off the throttle!
Posted By: Junky

Re: Rear gear - 05/09/13 10:50 PM

Quote:

Quote:

My 383 in my 70 Satellite is also a little lazy off the bottom. I think maybe just a bit too much cam in mine. I run 3.23's and have 275-60-17 rear tires. They measure right at 30". Last spring I put 3.91's in and ran them for a month or so. it helped it turn on sooner but it was exactly the same at initial start. I know it needs a converter, that would be the correct fix, but I am going to stay with the 1800 anyway. It runs pretty good from 2800 to 5500 or so.

sounds familiar.the bee has a 2000 stall in it.i am getting ready to put headers on it and upgrade the carb to a 750 cfm along with the posi and the 3.73.i hope its a different car.not that its bad now,just want to be able to burn both tires until i let off the throttle!


You may or may not burn both tires until you let off with a 2000 RPM 'verter. I'm running the Hughes Whiplash (0.518 lift, 229 degrees intake 242 degrees exhaust at .050) cam with 3.73 gears and 275/15/60 rear tires. It took some doing, but I finally got it tuned correctly and now can cook the tires from a standing start. Just standing on it, not doing a brake burnout first. That's with a 'verter that flashes to 2500 RPM. Not that I want to blow the tires off from a start, that doesn't get you to far to quick. If I bring up the R's a bit against the 'verter first it gets better traction. That way I'm not shocking the suspension and breaking the tires loose so bad. Just sayin'.
Posted By: 69suprbee

Re: Rear gear - 05/09/13 11:29 PM

thanks Junky.i think just a good 2 wheel tire spin for a little ways will keep me happy.i think the sure grip along with the 3.73 will make a good difference.if not then i will look at converter.
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