need help picking out GEAR RATIO

[73_RoadRunner]

i have a 75 dart sport 360 904 trans 8 1/4 rear need a new gear want something were i can go on the eway with out reckin my engine cause of high rpm and want somethin so my car isnt slow when taking off i was thinkin of somewhere around a 3.55 i have 3.92 right now got any ideas?

[440Ramcharger]

3.21 3.55 You pick it.

[73_RoadRunner]

3.21 sounds good but i donw want it to be dead out of the hole

[rumblefish360]

3.55 or 3.73 from radys ring and pinion.

[RDF73Charger]

I put a 3.55 in my Charger with a 8 1/4 and it turned out to be too stiff for my taste on the highway. I will change to a 3.21 or look into a overdrive unit when money permits. I changed up from a 2.73.

[dwc43]

3.21 if your stock. 3.55's will be to low on the street. Rpm's will be pretty high at highway speeds.

[gthomas]

Originally Posted by dwc43

3.21 if your stock. 3.55's will be to low on the street. Rpm's will be pretty high at highway speeds.

I agree, I'm running 3:55's with 265 50 tires and spin around 3400rpm in the slow lane on the freeway with everyone passing me. These tires are pretty short, but, if you're running 28 inch or taller tires I think you'd be OK.

[73_RoadRunner]

this is what i have stock 360 man reverse valve 904 tires P275/60R15 27"
stahl not sure takes off right away in 1st gear but if im in 2nd and down shift it stahls to around 2,800 rpm thats what i have so got any ideas now what would be a good gear thanks

[Clair]

With my 25.7" tall tires and 3.23 gears, I'm turning about 2500 at 60, and about 3000 at 70. With your taller tires, and a converter that loose, I'd go with a 3.55 to keep the converter pretty tight on the highway. That's not a whole lot different than your 3.91's (9-10% less revs), though.

Clair

[zij576ca]

I had 3.55's in my 383 Runner before I started racing it and I loved 'em. Great street/hiway gears. The 3.55's get my vote.