4:56 gear on the street

I can't find a 3:55 gear for an 8.5? I found one for an 8.2. What would you think for an 8.5?

DEMONSPEED wrote:I can't find a 3:55 gear for an 8.5? I found one for an 8.2. What would you think for an 8.5?

342

or 373

DEMONSPEED wrote: Hey, how did you calculate that stuff up?

As far as takeoff goes, all I did was multiply the rear gear times the first gear of the trans. So, for the 'glide that is 4.56 x 1.76 = 8.02. To compare it to a turbo 400, take the 8.02 and divide it by its first gear which is 2.48 which comes to 3.23.
I have played around with the online calculators quite a bit over the years. I don't take the info as "the gospel" but they generally get you in the ballpark for what you re doing. In the case of the gear ratio/RPM calc, I must say that I have my doubts. My Granada had a 4.11 gear and a 29" tall tire and it was 3000 rpm at 55 mph. That is an absolute fact. When I plug those numbers in the calc, it tells me 63 mph. With you having a 26" tire and with a 4.56, that makes it that much tougher for me to buy into what it is saying. If anyone knows a gear/tire setup that they have or had and what RPM it turned on the highway, please chime in. This is throwing me off a bit.

SPEED IN TOP GEAR 1:1 NON OVERDRIVE

AT 3000 RPM:

TIRE SIZE...R/225/70/15
DIAMETER .....27.402"

GEAR ................MPH
4.56 .................53.63
4.11..................59.50
3.70..................66.09
3.55..................68.9

SAME RPM

TIRE SIZE...R/225/75/15
DIAMETER .....28.287"

GEAR..................MPH
4.56..................55.36
4.11..................61.42
3.70..................68.23
3.55..................71.11

big dogs 42 wrote:You told me that this car wasen't going to be a every day driver and you wanted to run it at the track when you started and i said use a powerglide there was less to go wrong with them and the drag racers all seem to use them now are you going to drive it everyday or just to thrash on on weekends everyday the 400 . if what you want is to beat the eyeballs out of it on the weekend the glide we have two different applacations here . which is it?

Weve all been there man......its hard to make the best for both worlds......but its fun tryin

456 is a ton of gear!I think way to much for the street especially where you live,by the time you go through a intersection your in 3rd gear already.AS for the 400 turbo it won,t stay in low gear unless you put a trans pack in it,it will shift out by itself.They are strong!the 350 turbo just shift kit it and your done Joe switched his from a 400 to a 350 he said the 350 had a crisper 3rd gear. thats who you need to talk to about that stuff Joey!