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PG or th400?

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sixgun86gn

six offender
Joined
Feb 10, 2002
Messages
3,470
I am putting together a Chevy Luv with a 4.1 turbo with the 87 fuel injection setup.I want to know if I would be better off with a powerglide or a th400,and what I should use for gear ratio with either.Total weight should be well under 3000# with driver.I plan on using 28x10.50 15 slicks as well.
 
i would use a 400 with a 2.20 /1.40 gear ratio with a 4.30 ring and pinion.
 
That sounds like alot of gear.I was thinking 3.42s like in the GN because I have gotten deep in the 11s at full weight like that with 3700#.Chris why do you recomend that tall a gear?I thought the lighter truck would not need as much as the GN.Just wondering because I am still new to the serious side of drag racing.
 
What converter would you recommend using?I also want to mention that this is a 4.1 stock block with stock crank and rods.I want to keep the revs below 6000 rpm.
 
If the truck is strickly drag a PG will always be quicker than a three speed if the car is under 3000lbs. With the high torque and a loose converter it would be a good for the track not the street.
 
convertor choice will be governed by camshaft,turbo size ,amount of boost,transbrake or no transbrake ,suspension mods etc.with projected power being less than 700 the glide will make the engine sit on its dick in 2nd gear.the glide will need to stall higher to get a good launch and this will KILL top end hydraulic coupling efficiency of the convertor.above 700 {and i mean at the rear wheels}the use of the glide would not be so questionable and i would use a 1.80 gear glide with a 4.1 ring and pinion with a tighter convertor.too much rpm drop on a gear change will seriously impair the engines ability to gain rpm through the loss of the runaway case of momentum which allows rpm to increase with increased air intake and the pressure in the intake manifold even with a forced induction system.the higher the operating range becomes the narrower the power curves becomes and the available rpm to accellerate the vehicle will be a major factor in accelleration.if the motor was to see 7800 or so rpm i would then use a 1.66 glide with a 3.89 /or 4.1 final drive ratio.some may consider this foolish but it has proven very effective in my twisted perception of the game.
 
Well that said all I needed to know.I don't plan on making over 600 rwhp,so I will go with the 400 or a 350 maybe.Thanks guys.
 
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