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T-56 Magnum

  
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T-56 Magnum

 
powerpower powerpower
New User | Posts: 6 | Joined: 02/14
Posted: 02/23/14
11:05 AM

Gonna start building a pontiac 461 and want to put a t56 magnum but theres two options...for rear end im going to put a nova 8.5 rear what gear ratio would work great with the engine and trans??? For 1st gen f body  

ROWSLEY ROWSLEY
Guru | Posts: 1016 | Joined: 07/11
Posted: 02/23/14
06:33 PM

what are the low gear and o.d. gear ratios?

what are you doing with the car?

how much hp?  
76 455/4spd TRANS AM
69 GRAND PRIX 455/5SPD

powerpower powerpower
New User | Posts: 6 | Joined: 02/14
Posted: 02/23/14
08:34 PM

26 spline input shaft
31 spline output shaft
1st Gear: 2.66
2nd Gear: 1.78
3rd Gear: 1.30
4th Gear: 1.00
5th Gear: .80
6th Gear: .63
Rev: 2.90
This the close ratio  and i want the 461 to make around 500hp and around 550tq  

powerpower powerpower
New User | Posts: 6 | Joined: 02/14
Posted: 02/23/14
08:42 PM

Its just gonna be a street/freeway car once a while track.. couple road trips..and i want to try auto cross  

ROWSLEY ROWSLEY
Guru | Posts: 1016 | Joined: 07/11
Posted: 02/23/14
10:22 PM

sounds like alot of fun!!  i'm running a 500 hp 455 with a tko 600 5 speed and 3.42 gears. 2.87 low gear and a .64 o.d. it's in a heavy 69 grand prix.

at the drag strip it ran a best so far of 11.99 with a 1.75, 60" time on old 28" tall et streets leaving at 3500.

in 5th gear it turns 1500 at 55mph, i need something in between 4th and 5th. at 75 its at 2000 rpms just right on the interstate. with a mild 455 i got 18 mpg!

with the 2.66 low gear you can pull 3.42s but 3.55 or 3.73s would be better for playin!!

i'm planning on going to a road course this spring or summer in jennings ok, hallet motor racing.  
76 455/4spd TRANS AM
69 GRAND PRIX 455/5SPD