Help with rear end. Gears?

[DJMAN]

Originally Posted by 1-PU70

I may have missed it but what size tires are you running? I have 3:73's with a 700R4 and a 31" tire. At 70 miles an hour im at about 1800RPM's. With the BB its not a problem but with a 6 banger it might. I think I might be going to 4:10's after I check my cam specs.

275/60/15s

DJMAN

[Longhorn Man]

on a half ton, the 4.10 only came standard in a 3 speed with overdrive.

[profe56]

My idea is using 265 or 275/60/15 and I want to drive it on highway.
which one is more common 3:73 or 3:42?

[Jeff.44]

Hey fellas, I'm new here and I didn't know my reg. app. was approved untill I just took the chance to post here but I'll be taking care of that later on today.
I've got a 67' lwb that had a 250 I6, 3 on the tree. My brother in-law has a 6 speed from a camero he is giving me that I want to install with a double disk clutch and hydraulic tob. Now the engine I'm installing is a .060 over forged & balanced 350 with a .470 lift cam and Pete Jackson gear drive. My question is, if the rear end is a 3.73 (I haven't checked yet) how will that combo work out? My other option is a 400 turbo that I haven't had in a car for over 10 yrs. now so it needs rebuilt and I will have to buy a stall converter too.
Thanks Guys, great site.

[Jeff.44]

ttt?

[LONGHAIR]

Originally Posted by 69GMCLonghorn

Question for someone who might know more than I: My cousin had a 1980 K5 Jimmy. It had a 350/350 and had the HIGHEST highway gears I've ever seen! I think 1st gear wrapped out around 50 - 55 MPH. 2nd was an easy 80 MPH. What gears did this thing have in it?

I'm not 100% sure that they did it as early as '80, but I have personally taken quite a few 2.73s out of trucks as old as '82. I have seen as high a 2.56 with, believe it or not...an overdrive and in a 4x4 no less?