promtbiker69
Registered Member
i was wondering what stall converter i should get for my 86 k5 with a 454 700r4 and 38 inch tires truck is used for cursing and some off roading
CK5
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torque converter stall
- Thread starter promtbiker69
- Start date
Amtek
1/2 ton status
You forgot the most important piece of info, what gears do you have?
promtbiker69
Registered Member
I'm sorry , just 3.73 for now
Confedneck
3/4 ton status
as low a stall as possible.
you use your truck for cursing? seems to be a common trend when working on one of these.. lol welcome aboard
you use your truck for cursing? seems to be a common trend when working on one of these.. lol welcome aboard
promtbiker69
Registered Member
Cruising * haha and low as possible meaning ...
Confedneck
3/4 ton status
stock stall speed is what was recommended by my tranny guy when i told him i had 35s and stock gears
promtbiker69
Registered Member
What should stock stall be because the 700r4 was behind a 6.2 diesel
Confedneck
3/4 ton status
now it's behind a big block? use the diesel stall convertor. it will have a lower stall, should be perfect.
promtbiker69
Registered Member
Yea now it's behind a big block , thanks for the info
Lowest possible? Thats no fun
Amtek
1/2 ton status
3.73's with 38" tires? That gives you an effective gear ratio of 2.94 That thing will be a total dog even with a BBC and probably kill the tranny and overdrive fast, you gotta re-gear first! 4.88's would be ideal with 38's bring you to an effective gear ratio of 3.85 making it snappy off the line with a nice low RPM when cruising on the highway like it would with stock sized tires.
Now because you took the strain off the transmission with new gears, you can have a slightly higher stall torque converter for when you want hard/fast launches yet it wont slip much at cruising speeds. A 1700 to 2000 rpm stall TC would be perfect if you dont plan on doing any towing. You'll probably be able to break the 38" tires loose from a dead stop. If you do want to tow, then a stock SBC TC (1300-1500 stall) would be great behind your BBC and still have spirited launches.
Low stall TC's are for old boring people who drive like grandma going to church
Now because you took the strain off the transmission with new gears, you can have a slightly higher stall torque converter for when you want hard/fast launches yet it wont slip much at cruising speeds. A 1700 to 2000 rpm stall TC would be perfect if you dont plan on doing any towing. You'll probably be able to break the 38" tires loose from a dead stop. If you do want to tow, then a stock SBC TC (1300-1500 stall) would be great behind your BBC and still have spirited launches.
Low stall TC's are for old boring people who drive like grandma going to church
There's no reason for a higher than stock stall unless you have a hot cam.
And you will not get acceptable results with any torque converter until you have appropriate differential gears, as was said above.
And you will not get acceptable results with any torque converter until you have appropriate differential gears, as was said above.
Ned Kelly
1/2 ton status
For your calculations, my 454/th400/4.11/39.5" TSL cruises at about 2200-2300rpm at 55/60mph. Stock OEM convertor, and figure in some slip (5%?) as it is not a 100% lock-up convertor.
Wait, big block, 700R-4, 38's and 4.88's? I can't possibly think of where the weak point in that drivetrain would be...
1850 rpm at 60 mph...
5.13's would be better, 5.38's would be better stiil. 2000 rpm at 60 mph, the tranny might live.
1850 rpm at 60 mph...
5.13's would be better, 5.38's would be better stiil. 2000 rpm at 60 mph, the tranny might live.
