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Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Transmission - Rearend> Help picking gear ratio
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Topic Review (Newest First)
12-04-2012 02:54 PM
Pupsvette76 I'm 23 and only been putting engines together for a few years so I'm kinda new to all the terms what is LDA? Do u mean LSA?
12-01-2012 07:24 PM
vinniekq2 you have 4 degrees more duration on the exhaust side?you didnt say the LDA of the cam.If you have a turbo header with that cam? the duration is wrong way for split.
This engine should break the tires loose with 2.7 gears.how many cfm does your turbo charger system move?
12-01-2012 05:20 PM
Pupsvette76 It runs good I didn't wanna run a huge lift cam or a huge duration cuz I didn't want any piston to valve clearance issues
11-30-2012 03:25 PM
vinniekq2 does it run ok with that cam?
11-30-2012 02:53 PM
Pupsvette76 Currently there are 4.88 in it and I can just feel the engine running up in rpm to quick to make power... The gear I have doesn't allow much time in each gear and it pulls me out of my powerband
11-29-2012 06:43 PM
632Mantis Larger diameter rear tires ( 29" slicks )
3.73:1 gears
Powerglide tranny.

11-29-2012 04:59 PM
prostreet6t9
Quote:
Originally Posted by Pupsvette76 View Post
It's a 295 50 15 =27inches tall
As Autogear stated... I'd shoot for a 331 or 355 gear.
11-29-2012 10:47 AM
vinniekq2 If you are racing then you need some tires first.The trans wont last long
11-29-2012 09:39 AM
prostreet6t9
Quote:
Originally Posted by AutoGear View Post
Traditionally, turbo cars do not like a ton of rear gear. I would say somewhere in the range of 3.55:1 - 3.31:1.
^^What he said!

It seems like the turbo like a little load put on it.
11-29-2012 08:03 AM
C-10 Not trying to one-up anybody but my old single axle med. duty dump truck has one of those 2 speed rears, Eaton, get this- 6.50-8.85!.. The spicer 5 speed is 1:1 in 5th!.. Of course 11r 22.5 truck tires, but wow does she have some gear..

On topic, I like a combo for the street that gets you right at 10:1 in first gear, all in, through the tires.
11-29-2012 06:51 AM
AutoGear Traditionally, turbo cars do not like a ton of rear gear. I would say somewhere in the range of 3.55:1 - 3.31:1.
11-28-2012 07:54 PM
big gear head What will you be using the car for?
11-28-2012 07:45 PM
Pupsvette76 It's a 295 50 15 =27inches tall
11-28-2012 06:58 PM
prostreet6t9 How tall is your tire??
11-28-2012 06:41 PM
Pupsvette76
Help picking gear ratio

Hey guys I need some help picking the right hear ratio for my car it's a 70 chevy nova with a sbc 355 with afr 215 heads 75cc chamber edelbrock roller cam .539/.540 lift 234/238 duration at .050
Single plane intake manifold professional products efi a gt45 turbo at 15-20psi b&m hole shot converter 3000 rpm in a turbo 350... Any help is appreciated

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