6.4 transmission

michaels87.ma · May 10, 2016

Just wondering how much power can my transmission/drivetrain take

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Big Bad 6.4 · May 10, 2016

This should help. Found it under the 6.4 section.
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Old 05-18-2011, 02:20 PM
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Default Read first please!
like mentioned in the 6.0 aftermarket section by rescuef250, keep this thread for performance and aftermarket regarding the 6.4 powertrain and trans.

there is a certain section for wheels, tires or anything more cosmetic

http://powerstrokearmy.com/forums/forumdisplay.php?f=13

^^^click

quick info about modding your 6.4

400-500 hp level: Look no further than a tuner exhaust and an intake, other typical reliabilty mods will include egr block off plates. At this level transmission and headgaskets should last a long time, but like anything else mechanical parts fail all the time for no good reason, same applies here.

500-550, still pretty reliable, starting to ask alot of the trans and head bolts, tuner only numbers still apply

550-600, 575-580 is pretty common on just a tune, some trucks will go over 600 hp on the dyno and track numbers. At this level the trans is on its last leg, and the headgaskets are bound to start to leak sooner than later, studs, egr ******, and trans are recomended, power can still be made on stock turbos.

600-700hp, Here is where things start to get fun, get the fundamentals out of the way, truck should already have studs, trans, and full egr ******.
Couple options are adding fuel to stock turbos, and push to about the 650 hp level.

Stock fuel system, air dog, stock HPFP, stock nozzles
Tow power atmosphere should net around 625-640 on stock fuel
Drop in batmowheel should net around 615-630 on stock fuel
Tow powerX/high power turbos should net around 650-670 hp on stock fuel
High power turbos should net slightly higher
Single turbo in the 66mm range from MPD should net 625ish hp on stock fuel
Single turbo in the 70mm range from MPD should net 650ish hp on stock fuel

Fuel mods in the 600-700 hp range
Stock turbos, 640 ish hp with 110 injectors and industrial/dual fuelers
Tow powers should be right at the 700 hp level with 110s industrial/or dual fuelers maybe a little on the conservative side on hp

700-800 hp
Tow powers and 110s are going to be just over 700 hp, we will put it in both categories
High power/ towpowerx with 110s should be about 725-750 depending on tuning injectors ect
Max powers and 60hp nozzles should be 725-750
ONLY set of stock injector over 700hp is mpd compounds @ 707? hp with bone stock fuel
71mm mpd single with 60% over injectors should be in the 750 hp level
Max powers and 110s should be in the 775-800 hp level

800+ hp

Maxpowers 150 injectors dual fuelers solid 850 hp at sea level uncorrected
MPD 75mm single with dual fuelers is in the 900 hp range depending on the turbo and truck, some higher some just a shy lower.

:note: these numbers are based on info gathered on other members trucks, there are too many variables to say that each combo will net x amount of power but this is a good start.
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Last edited by Dzchey21; 12-13-2011 at 10:18 PM.
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MrMike2010 · May 10, 2016

The trans in these trucks are quite tough. Tuning and driver input really dictate how long it will survive. Big bad6.4 posted some really good info to use as a guide.

Fwiw, I ran G e a r h e a d tunes on the highest setting from 2k-90k miles when I sold it. I had a 71mm low pressure turbo for about 55k of those miles. The truck was not abused, but did see plenty of track passes/dyno runs. Pair that up with full throttle runs every time I got on the highway and the trans never skipped a beat. No shift flares or missed shifts once so ever. I did however realize how much power these trucks make in stock form and always had funds set aside for that rainy day.