Quote:
Originally Posted by weq92f
It is the right combo for me in terms of off-the-line gear and highway cruising. The stall I have is not enough. This cam update has done a lot in the way of improving this truck. I'm still tuning so can't really update fully on the cam update and what it has done to this engine, but the BBC=>700r=>3.73 definitely makes for a great combination IMO.
EDIT: It's not all roses. IMO the weak point of the 700r is the gear ratio jump between 1st and 2nd...
... for comparison have a look at this little chart showing gear ratios for popular transmissions. Note the 700
... has a 1.44 difference between 1st and 2nd gear where the 350 and 400 have only 1.0.
Trans.....gear ratios 1/2/3/4/..
700r4.....3.06/1.62/1.00/0.68
th400.....2.48/1.48/1.00
th350.....2.52/1.52/1.00
powrg.....1.76/1.00
and for fun...
6L80E.....4.03/2.36/1.53/1.15/0.85/0.67
8L90E.....4.56/2.97/2.08/1.69/1.27/1.00/0.85/0.65
10LXX.....4.70/2.99/2.15/1.80/1.52/1.28/1.00/0.85/0.69/0.64
Hth,
-klb
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Thanks for your input. I think Ill look around the 2200-2400 rpm stall when I do mine. I don't really want to spend $1k so Ill probably look into a stock sized converter. I also don't know what cam is in my truck so its hard to judge whats needed.
I haven't put many miles on my build yet but the 3.08 and the 2.48 first gear makes for a long time before getting into second. Itll still bark the tires pretty nice though going into 2nd.