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Building a 4L60E for ~350hp

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Old May 18, 2010 | 04:49 PM
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Default Building a 4L60E for ~350hp

I have no idea what my truck is going to make horsepower wise, but im assuming around 350-380 to the rear wheels (5.3L TR224/224 cam, 3600ss yank, longtubes, tune, 4.10s, other small stuff)


What should I do to the trans? (stock 4L60e unit)

I currently have a vette servo and trangsgo HD-2 kit but want to buy a few other things before I bring it to the trans shop.

I heard to buy the following:

ACDelco 5 pinion rear planetary
Raybestos Z-Pak
Kevlar Band

What else is needed/recommended?

Thanks in advance
-Cook
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Old May 18, 2010 | 04:55 PM
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i think you would be surprised how well it will hold up with just the vette servo and transgo. However i would look into forward metal accumulator pistons, as well as the 1-2 metal accumulator pistons. Then a strong 3-4 clutch pack, heavy duty 2-4 band, GM 5 pinion plantetary and a sunbeast sunshell.


Im going to be running LT's, tune and 3200 stall with just a vette servo!
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Old May 18, 2010 | 05:01 PM
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I have a feeling that 3600 stall will destroy my trans fairly quickly. do u have links to the stuff u suggest?
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Old May 18, 2010 | 05:02 PM
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I just had one built
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This is whats in mine
TCI Hardend INPUT SHAFT & DRUM ASSEMBLY With Support ring and machined piston

Teflon coated bushings.
Torrington Bearling kit
Hardend pump rings and spring
Beast Sunshell (replaced my current Beast)
AC DELCO 5 pinion Panets (Front only)
BORG WARNER INPUT SPRAG 29 ELEMENT DUAL guage
ALL Red Eagle Clutches + Koleen steels
Reverse clutches for the new reverse clutch
Shift servos
Aluminum accumilator with no pins
Extra Wide Red Eagle band & new Reverse drum
Hardend Pump rings
No CORK GASKET but a fibre one
HD2 Shift kit
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Old May 18, 2010 | 05:09 PM
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The 4 pinion planets are good enough for what your looking to push. I bought a set and could not find a bearing for the rear planet. Do get a trans cooler, I alerady have one.
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Old May 18, 2010 | 05:10 PM
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how much did those parts run you?

and do i need front and rear planetaries? or just the front if upgrading to the 5pinion?
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Old May 18, 2010 | 05:10 PM
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word, i got a 40,000 GVW cooler
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Old May 18, 2010 | 05:12 PM
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My trans and converter installed, $3k
$400 for install and cleaning up the the complete trans, valve body(4-5 hours) and replace the trans mount.
$800 for the rebuild
The rest in parts
I bought parts ahead of the build to make it less painfull on my wallet.

My builder told me that the front planet is the important one that take the beating.
DO get a torrington bearing kit and replace all the bushings. There are some that I used that have a teflon coating in it.


Last edited by pasadenaman; May 18, 2010 at 05:18 PM.
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Old May 18, 2010 | 05:42 PM
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thanks for the info man

so far I'll buy the following:
Kevlar band
5pinion front planetary
raybestos z-pak
all new bushings
torrington bearing kit
beast sunshell
red eagle clutches
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Old May 18, 2010 | 05:48 PM
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tuning plays a major role too in your trans life. I would suggest leaving some TM perhaps as well if not going with a fully built setup
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