In 6th gear at around 70 mph what RPM do you turn w/ your 4.10's? Thanks
-Rippin

 

2K give or take a few. With the stock 3.42's it was 2K at 80.

Jeff

 

datamaster shows me turning 1925 at 70

 

i am one of the lucky people with a 93. no one told me the tranny was geared different from the 94 ups. i turn around 2400-2500!

i do know that 75 is 2600

 

I'm running 315/35/17 BFG Drag Radials out back and I'm turning right about 2,000 RPM at 70 MPH in 6th.

 

I turn like 1900 at 70 w/ 3.08's and my 5-speed. T56 is coming soon and I know the 3.08's will be a dog so I'm deciding between 3.73's and 4.10's. What do you think I should go with? Now tell me this, does it make one heck of a difference acceleration/seat of the pants wise? Also, how much would it be to have them installed? Thanks
-Rippin

 

Yes, the 4.10's felt alot stonger than my stock 3.42's. If you go 4.10's you will want some good tire, like some DR's to take full advantage of them.
You will also want to buy new bearings, and shims for the install and I paid $200 for labor, I provided all parts and lube. Make sure you go to a reputable place, they can be installed wrong and whine like a ****'. Now that I have the bottle 4.10s are a little too much, I may back down to a 3.73.

Either way if you are going 3.73-4.10 from a 3.08, its going to be alot more fun.

Jeff

 

What does your motor rev to? I don't think quite as high as the LT1 so my initial hunch is the 3.73s will be better. Also what size tires? Here are some calculators for you:

http://www.fbody.com/calc.htm

Requires Excel
http://www.personal.psu.edu/users/b/...alculators.xls
there are worksheets for Speed, RPM, ect. I also already have the T56 tranny ratios in there.