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Author Topic:   big ten(8.5)gear ratio's
rico 08
Dirt Freak

Total posts: 372
posted March 20, 2003 10:02 PM
What range can you get gears for the big ten bolt rear?I need a 2.41 but haven't heard of these only down to a 2.56,anyone know?

Dirt Forum Champ
Total posts: 564
posted March 21, 2003 02:32 PM UIN: 25419780
I use to run a 241 in my cuttlass..Is was was a 74 .. the big car..I think 72-76 should have way to tell is get the 8th didgit off the vin number and call you local dealer.. the can run a check on the and see what was in that car.. ]I have a 538 in my ten bolt..

[This message has been edited by Pickel (edited March 21, 2003).]

[This message has been edited by Pickel (edited March 21, 2003).]

Dirt Full Roller

Total posts: 42
posted March 22, 2003 07:19 AM
I see 2.41 gears in 76'-77' Montecarlo's

rico 08
Dirt Freak

Total posts: 372
posted March 22, 2003 07:45 AM
Thanks guys hopefully i can find some.

Dirt Maniac

Total posts: 115
posted March 22, 2003 06:03 PM
Nothing in the vin number will help you on the gears for the older cars. Besides the 8th digit is the engine code.
as for 2.41s look in 78-80 impallas.

Dirt Forum Champ
Total posts: 564
posted March 22, 2003 07:57 PM UIN: 25419780
Oops o5 you are correct the 8th digit is for the engine code my mistake.

Dirt Forum Racer

Total posts: 77
posted March 23, 2003 09:40 PM
Impalla is a 7.5"

Dirt Full Roller

Total posts: 67
posted March 31, 2003 04:39 AM
All of your Buick Regal pre 86 7.5 have 2.41 gear ratio. But i'm not sure they will work, because of the carrier.But i do know,if your going to run dirt with that rear end,you don't want a 2.41. To high of a gear.The higher the # the Lower the gear.You'll want a 4.10 or a 4.56 gear,and that's just starting to get you to where you want to be.Just went through all of that myself,trying to get mine to work.But i had a 7.5 10 Bolt.So with a 8.5 you could probly go lower than a 4.56 ring an pinion. You'll want to make sure your Carrier will carry your gear also.Jeg's has the best price i could find.But to make that 7.5 to work would of cost me over 700.00,with Ring and Pinion, Carrier, and the posi traction sleave,or what ever its called.So O8 i went to a Ford 9". Got one that bolted right up to my Regal,for 300.00. Hope this helps.3e

Dirt Forum Champ
Total posts: 1565
posted March 31, 2003 08:31 AM UIN: 54865418
gordon you need to shop around man i could also built 2 rear ends for 700 thats including brand new gears and hardened axles. and your ratio in the rear doesn't realy matter becuaes you can run thru your tranny to get the ratio you need with a 2.41 first gear in a t-350 2.52x2.41=6.09. and guys not all impala's has 7.5 some came with 8.5.s i have one thats a 3.23 8.5 in my 84 endureo car

rico 08
Dirt Freak

Total posts: 372
posted March 31, 2003 11:39 AM
I agree that 2.41 is high but i'm not shooting for a total gear,they don't make a 6.00 gear in a 10 bolt,so i have no choice,17j is right on i'm going to use a 350 turbo.I found a gear on e-bay for 35.00 including shipping,if anyone can beat that they better speak up.

Dirt Full Roller

Total posts: 66
posted April 01, 2003 08:39 PM
I ran an 8.5, gears and parts are getting hard to come by.
Not ALL impalas are 7.5, some are 8.5.
The ones you find that are 8.5 you need to check axle length and spline. I'm not saying I know all about theses rearends, just some trouble I ran into last summer.
Also not to make a (plug) advertisement for them but at National Drivetrain you can get new ring and pinions for 8.5 for 125.00, save some cash!

Dirt Freak

Total posts: 310
posted April 01, 2003 11:19 PM
Advance has a sale on some gears rt now Southern gears 8.5 342 373 308 ha several 9 in sets just a fair variety might be worth a look

Dirt Roller

Total posts: 13
posted April 03, 2003 05:58 PM
i ve found alot of camaros with that gear we ran that gear for the last six years and curently running it now have several here ran first in three speed auto and now run second in a saginaw four speed 248 and 241 is 595

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