Another Converter Question

[nivvy]

Lets say you have a 4000 stall and you are shifting at 6300ish when you shift and the rpms drop down to lets say 3500 does the tranny slip until you get back to your stall speed of 4000........ 

Just wondering if its the same principal as cruising around in low and the tranny is slipping a little until you hit your stall speed

I have a manual valve body if that matters 

I know four40cuda and oldschool have a 3800 stall... just curious what your rpms drop back down to after shifting

[Chryco Psycho]

that is right , any time the RPM drops below the stall RPm of the converter the converter will unlock until stall speed is reached again

[nivvy]

my 3000 stall works good now.... what really is the max for the street... 

[Chryco Psycho]

it depends on the gearing you have , if you have 2.76 gears & a 3000 stall you will be at 2500 @ 70 mph & the converter will be unlocked , use a set of 4.56 gears & 4000 stall should be fine at 70 MPH

[nivvy]

with my 3.91's I can be doing 65 mph on the highway and be at 3000 and would be fine....maybe Ill go to 4.30's 

[gkring]

At full throttle when you do shift the rpm are going to drop pretty close to the correct rpm for the speed or the stall speed, whichever is higher. You definitley want to go with a convertor that is tighter if you have them narrowed down for a street car. A 4000 stall convertor does not mean the car will not move untill the engine reaches 4000 rpm, but the cheaper (qualitywise) the convertor is the more slippage there will be. The extra money spent on a better convertor matched to your setup will be evident on the efficiencies of it. it will "slip" less at speeds below the stall and get closer to a true 1 to 1 lockup on the topend. It's easy to tweak fins and produce a cheap convertor with a 4000 stall, but it wil show up as poor trap speeds because that same slippage is occuring at the higher rpms as well.

[tactransman]

      Well said!