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Author Topic:   Gear Selection
RacerCrash6
Dirt Newbie

Total posts: 3
posted April 26, 2004 06:58 PM  
I have ran mini stocks all my life and have now ventured to Bombers. I run a mid to late 70's Camaro with a 350 SBC and 305 heads. The SBC has flat top pistons bored .030 over and I have to run automatic. I have a 2 speed powerglideand I am not sure if it is the 1.76 or the 1.82 as of yet. My question is should I switch to a ford nine inch rearend or is there something better for chevy gears on a 3/8 mile track?

chargincharlie_00
Dirt Roller

Total posts: 10
posted April 26, 2004 07:04 PM  
we need to know the gear in the rearend. and yes, a 9" is much stronger and easier to change gears

RacerCrash6
Dirt Newbie

Total posts: 3
posted April 26, 2004 07:06 PM  
I have not had a chance to check rearend, I was just wondering if there was an ideal chevy rearend gear. It will help when I do tear it down and see if I already have the one you mention

RacerCrash6
Dirt Newbie

Total posts: 3
posted April 26, 2004 07:10 PM  
Also, if ti helps I am only allowed to run 70 series 15" D.O.T. tires

DirtFreak08
Dirt Forum Racer

Total posts: 77
posted April 26, 2004 07:48 PM  
I would go with the 9" ford if its affordable or rules allow it. Much stronger. With a powerglide I would go with a 3.42 chevy gear or a 6.00 to 6.20 ford gear. Your car sounds a lot like mine. I run a 350 bored .060 over and bigger heads. But I have the powerglide with a 9" rearend geared to 6.20. Very quick takeoff in low, then shift to high gear. I run on a 1/4 mile track. Hope this helps.

hobby39
Dirt Maniac

Total posts: 112
posted April 26, 2004 09:33 PM  
I run almost the exact set up however were not allowed to run ford 9". I was told i had 3.08 gears in the car but I was always getting pulled off the corners and on starts/restarts so my sponsor suggested we needed to check the gearing come to find out i had 2.56 put 3.42 gears in before last weekend and holly cows i can't believe the difference it makes.

racer17j
Dirt Forum Champ
Total posts: 5390
posted April 27, 2004 04:43 PM  
ford 9 inches are nice and yes are strong...but the chevy rearends are not a bad choice, if your only running one specific track where you do not need to change the gear often. Plus the weight difference is astronomical. The 9 inch, if I'm not mistaken is almost 50 pounds heavier than the chevy counter part (base on the older 10 bolt). Thats a ton of unsprung weight. I went two and 1/2 years before breakin and axle, and it was due to a car slammin into the right rear which I garantee would have broke or bent a nine inch also. Like racer17j, need more info to suggest a gear.

whiskey4749
Dirt Newbie

Total posts: 4
posted April 28, 2004 05:09 AM  
quote:
Originally posted by RacerCrash6:
I have ran mini stocks all my life and have now ventured to Bombers. I run a mid to late 70's Camaro with a 350 SBC and 305 heads. The SBC has flat top pistons bored .030 over and I have to run automatic. I have a 2 speed powerglideand I am not sure if it is the 1.76 or the 1.82 as of yet. My question is should I switch to a ford nine inch rearend or is there something better for chevy gears on a 3/8 mile track?

Looks like you run where i do(t-bird). If its any help I run a chevy 10 bolt w/locker 2.41 rear gear w/ 3speed auto, 1st gear and with 84" rear tire i am turning around 5800-6000 rpm.You can find this gear at any bone yard.there abundant. unless you are making 450 hp or more we have had excellent luck w/the chevy rear ends.7 years racing at the "bird". hope this helps ya.


juliaferrell
Dirt Freak

Total posts: 370
posted April 28, 2004 07:47 PM  
Did they make 2.41 in the big ring gear chevy's? Or do you have to run the 7.5? What's the best *cheapest* way to lock them up?

racer17j
Dirt Forum Champ
Total posts: 5390
posted April 28, 2004 08:45 PM  
I haven't seen a 2.41 in the big ring gear. I've only seen them in the 7.5's. I might be wrong here, but I think the smallest gear they got for the 8.5's is the 2.73.

whiskey4749
Dirt Newbie

Total posts: 4
posted April 29, 2004 05:07 AM  
quote:
Originally posted by juliaferrell:
Did they make 2.41 in the big ring gear chevy's? Or do you have to run the 7.5? What's the best *cheapest* way to lock them up?

yes it is the 7.5 ring gear.I belive that they only make it in the small gear.(not totally positive) i purchased a locker for $90.00 from summit racing, we have welded the spider gears but if you dont get it welded just right and clean all the flashing and **** out when done you will have problems.


rico 08
Dirt Forum Champ
Total posts: 1139
posted April 29, 2004 06:07 AM  
You can find 2.41's for the 8.5 if you look,i sold a camaro with that gear as an extra...i'll check to see if they are going to use it or not.

juliaferrell
Dirt Freak

Total posts: 370
posted April 29, 2004 12:47 PM  
Thanks Rico8. I'd definitely be interested in them. Let me know what you find out?

juliaferrell
Dirt Freak

Total posts: 370
posted April 29, 2004 12:48 PM  
One other thing. Is the little gear dependable? I know chevy's are bad about axles.

DirtFreak08
Dirt Forum Racer

Total posts: 77
posted April 29, 2004 02:58 PM  
Yeah they're dependable. I ran my chevy rear end for 3 years, never had to replace a thing. It was all stock, the only thing done to it was welded the gears.

backofpack
Dirt Maniac

Total posts: 102
posted May 02, 2004 06:45 PM  
we run a 3/8 mile track with a 182 powerglide i run a 557 10 bolt chevy gear in hi gear use the low gear for starts really works great on a dryslick feature i didnt think i would like it at first but it will suprize you beleive me

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