Quote:
Originally Posted by ubtripn
All I know is that I run stock tires on my 68 with a 700R4 and 2000 RPM= 60mph on the freeway. Is this a good balance for fuel consumption vs power? I do mostly city driving. I do not know how to identify what rear end ratio I have.
Also, there is a lot of talk about the lack of aerodynamics causing instability but what about rigs like the Hummer. They are bricks but drive much better. There must be more than just stabilizer bars involved. (Just a learning question.)
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gear 700R4 TH350 TH400
1 3.06:1 2.25:1 2.48.1
2 1.62:1 1.52:1 1.48:1
3 1.00:1 1.00:1 1.00:1
4 0.70:1 n/a n/a
The 700R4 is an 4 speed box with the last gear an overdrive ratio so comparing speeds and RPM between different trucks to guess at your diff ratio won't work particularly well unless you put it in 3rd and you have the same tires. Put the truck on jackstands and either pull the diff cover and check what's engraved on the edge of the ring gear or spin one rear tiire until the pinion goes through two complete turns and divide the number of turns on the tire by two to get the diff ratio.
As for stability, if you have good tires you can't get enough horsepower out of your engine to push that brick fast enough to check 'aerodynamic stability'.
You'll need a wind tunnel for that. Try NASA Dryden Reasearch center.
