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Parts upgrades required for a high-hp 4l60e above the usual street/strip 4l60e

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Old 04-22-2009, 01:01 AM
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FormerVendor
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Default Parts upgrades required for a high-hp 4l60e above the usual street/strip 4l60e

Ive had one of our "street/strip" 4l60e's in my wifes 10 sec SS. With the new D1sc/fmic setup on the car, I sold the complete 4l60e/converter setup out of the car to a friend was going to follow the typical TH350/400 swap that ive done many of for the car to live at the 600-700 rwhp level the car is at.

I dont build my own trannies, a good friend of mine owns a local transmission shop and builds what ever I need for just cost of parts...He is putting the best parts he knows of in the tranny now, but im looking to add some more that I see in the FLT/Performa/RPM race 4l60's....

So far have had great luck with no problems at the 500-550 rwhp level with our current 4l60e's but im looking to go with some additional upgrades of hard parts over what we normally do.

Heres what parts I use now in a typical build (copy/past typical setup from one of the vendors sites):

# 8 B/W hi-energy clutches w/koleen steels in 3-4 clutch
# Seal & gasket kit
# Bushing kit
# Alto wide 2-4 red lined band with reinforced anchor
# Bonded pistons/input drum
# Beast sun shell
# B/W 29 element sprag
# 4L65 low roller clutch
# Transgo HD-2 shift kit
# Corvette servo
# New solenoids
# New internal wiring harness
# New GM Spacer plate
# B/W clutches
# Updated aluminum accumulator pistons
# prepped valvebody
# Filter
# Set end play to specs
# Install new cooler fittings
# Deep alum pan

Parts im looking to upgrade to :


5-pinion front/rear planets
Billet 4th gear Servo


Anyone have any input in the need of these parts, not sure what need they are exactly:

1) sleeved input drum
2) Bearing style reaction shaft


3) What level is a 300m output/input shaft needed, ive never broken one:


any other upgrades?
Old 04-23-2009, 12:07 AM
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