Given the stock TBI 454 and TH400 in my truck, which one do I need and, most importantly, why?
CK5
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Torque converters
- Thread starter Zeus33rd
- Start date
Thats not quite as easy question as it would seem.
However, if the truck performed well with the converter you had, then I would consider going back with stock if the engine is stock.
But since you increased tire size over stock, you might want to go with a slightly higher stall speed to let your engine develop more torque.
Here are a couple of links that explain stall speed fairly well so you understand how different gear ratios, tire size, and even slight engine mods can affect your choice.
http://www.carcraft.com/techarticles/selecting_right_torque_converter/index.html
http://www.hardtail.com/techtips/selectingconverter.html
The problem with these articles is that they are for street vehicles and are concerned with getting off the line and highway driving.
You want to do all that too, of course, but in your case if you need higher engine rpms for more power during rock climbing or heavy mud, you can just go lower with the gears.
Basically, listen to the guys here who have trucks like yours and who have changed a lot of TCs.
But read the articles so you will be able to follow the reasoning.
Personally, I think that your best bet is to set it up for good highway performance and let the gears take care of the off road stuff.
You can pretty much get any engine RPM you want at any MPH with the right shifting.
However, if the truck performed well with the converter you had, then I would consider going back with stock if the engine is stock.
But since you increased tire size over stock, you might want to go with a slightly higher stall speed to let your engine develop more torque.
Here are a couple of links that explain stall speed fairly well so you understand how different gear ratios, tire size, and even slight engine mods can affect your choice.
http://www.carcraft.com/techarticles/selecting_right_torque_converter/index.html
http://www.hardtail.com/techtips/selectingconverter.html
The problem with these articles is that they are for street vehicles and are concerned with getting off the line and highway driving.
You want to do all that too, of course, but in your case if you need higher engine rpms for more power during rock climbing or heavy mud, you can just go lower with the gears.
Basically, listen to the guys here who have trucks like yours and who have changed a lot of TCs.
But read the articles so you will be able to follow the reasoning.
Personally, I think that your best bet is to set it up for good highway performance and let the gears take care of the off road stuff.
You can pretty much get any engine RPM you want at any MPH with the right shifting.
blueblazes44
1/2 ton status
I agree with Fordum and the amount of stall really depends on what your goals are for the truck. The folks at www.accperformance.com can help. I have used the Boss Hog t.c for 2 yrs. The ask many vehicle specs. and help you decide based on your intentions of use and amout of mods.
79rustyk10
3/4 ton status
Id say a stock one, seeing that a higher stall converter is pointless with an engine that makes peak torque so low in the RPM range.
Im sure some company makes a towing/HD converter that would work awesome for you.
Im sure some company makes a towing/HD converter that would work awesome for you.
