Stall speed question

BHaden · 02-28-2010, 07:50 AM

I have a new-to-me 95 3500 4x4 Ext cab auto with 3:54s and 235-85/16 tires. The trans is rebuilt (AAMCO) by previous owner. It shifts nice and firm and seems to be in great shape, but the TC flashes to 2200rpm+ when I hit it moderately. I understand thats "the way they are" and will at some point put in something better when I can afford it and have nothing else to do (HA!). I do not know what type or brand they installed at rebuild; maybe they just cleaned the old one and put it back. My 12 valve is Modded slightly; 4" turbo-back straight-through, AFE-BHAF, #10 plate. Maybe some other p-pump tuning, but I haven't looked further. I have yet to see any visible smoke from the drivers seat, and it is nice and crisp off-idle. I have seen a TC listed, I THINK it was a TCI, that showed a 900rpm stall speed in the specs. I can't find that listing again at the moment, but even with all that diesel torque, 900 seems a little low. This truck will be strictly commuting, hauling and occasionally trailer pulling up to 10,000lbs.

My question is; how low is too low for stall speed? Can you get so low the turbo never gets spooled or is too slow? The current TC is so loose the tach doesn't move when the tranny shifts under load. It just floats around the 2000rpm mark until the TC locks up or I back off!

TIA....

Went from a 2006 Mega Cab to the 95 12 valve and likin it! Major old-school
basic machine. Feels good to get greasy again!!! And NO PAYMENT BOOK!