SK 48RE Identify valve body

2003-2008 Diesel & V10

Increases Torque Capacity
Lockup & Shift Firmness
Reduces Drainback
Perfect for Diesel Trucks
48-RE Application
8th vin digit = C 48RE Trans
8th vin digit = 6 47RE Trans
This kit only fits VB’s WITH a balance hole here in the main plate.
If your original plate does NOT have this balance hole, USE SK®TFOD-Diesel kit.

This product IS NOT compatible with any 46-47RE Swapped / Hybrid valve body
or any previously modified 48RE valve body’s from any other sources.
1. If trans is apart, install Seal Rings.
PLAIN
Two large Seals
One smaller Seal
0 2. Install new PLAIN lower 1-2
Accum spring as shown. Some
Upper Spring
Reuse
Forward drum Direct drum models use upper spring reuse it. (If Equipped)

Good News!
New parts were added in an
effort to help reduce governor
transducer failures common
Two smallest rings with this transmission.
not furnished in kit. Pump

2/17/2024 Page 1 ©TransGo 2024

 When Installing multi clutch converter SKIP step one.

1. Drill one or two .076—.083 holes

down through the bottom of the most 2. For NORMAL USE skip this step.
outboard passage. If later throttle on up-shifts are desired,
One Hole = Slightly firmer lockup install new GREEN TV spring.
Two Holes = Much firmer Lockup No need to grind TV valve.

GREEN
(optional) Large hole inboard
Got a worn TV valve bore? Order P/N TF-TV
A redesigned TV valve that’s a “drop-in” fix.
No special tools required!

3. Turn the valve body over. Using

the edge of a large file, file a notch
about halfway thru the thickness of
this partition.

File a notch
across bore,
side to side.
It’s not fussy.

2/17/2024 Page 2 ©TransGo 2024

 Watch out for this:
Wear in the Boost Valve bore area causes repeated Boost Valve
rear band failure & lazy or erratic pressure rise.
FIX IT NOW!
Order P/N TF-Boost Our redesigned boost valve
fixes the issue without any special tools required.
An easy “drop-in” solution to a high risk failure. Factory Parts shown for information only.

1. Install the New

ORANGE spring here.
2. Install New transfer
plate between cover and
part throttle body.
Transfer plate No need to remove these
three springs & valves.

Part WNNfM1
Throttle Gold
valve Spacer
Pin

Cover Hold it! Part throttle body

Read First!

3. For models WITHOUT a TV cable (Uses a Throttle Motor) 4. Use a pick and a small hammer to taper
AND is equipped with a engine power chip or programmer: the top of this hole to help start the pin.
Install the gold spacer into the part throttle body. Then install the Install pin furnished into this hole, using needle
part throttle (PT) valve. This will reduce the possibility of a light nose pliers and small hammer. File flush if
throttle 2-3-2-3-2-3 shuttle shift condition. This condition has needed. PT body must sit flush against VB.
not been found on TV cable equipped models.

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 New Design Manual Valve
Arm Tip
1. Insert spring and ball into VB
pocket. Use the Mumbly Peg to Tapered Rooster
hold the ball in place. Insert new Land comb
Manual Valve and reassemble the
rooster comb. Remove peg.
POCKET

Detent spring & ball Mumbly Peg

Detent Ball sloppy in the pocket? Order P/N TF-Detent
New “drop-in” design keeps manual valve indexed correctly!
Six Check-balls 2. Install CHERRYBOMB here.
One Cherrybomb Careful to align stem UP through hole
in plate when putting VB together.
3. Grind one notch on slight angle to about the
middle of this land. Reuse original spring.
Five 1/4” (.250)
One 11/32” (.343) CHERRYBOMB Switch Valve

4. Manual Valve position.

With valve all the way inboard (Park position) the right edge
of the Tapered land must be flush with right edge of parti-
tion “A”. (.030” from flush either way is ok.)
To Adjust: Bend Arm tip with pliers.

Cutaway View
Partition “A”

Tapered Land flush with right edge of Partition “A”

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 1. Place .156 drill into hole shown and drill all 2. With small punch drive tapered PLUG just
the way through the accumulator housing. With below flush into the hole.
small punch drive Plug into hole just below flush.

Plug 3. Install New Limit Bushing, 3/16 Ball and

White spring as shown.
Drill thru

Tapered
Plug

Bushing
White
4. Install the new
3/16
TRANSFER PLATE Ball

5. Discard No Need To remove.

original spring
Install three new
Red Springs.

rf\N\MftM}JJJ

cmmmJJ.Jill . . . . . . . .

2/17/2024 Page 5 ©TransGo 2024

 Lower Body Heads Up! Lower Plate (Small Plate)
Make sure these small holes are clean or NO
4th and/or NO TCC will be the result.
DO NOT enlarge these holes! Line-up bolt
A .020” paper staple fits even in the smaller Lower VB
of the 3 holes & will clean any debris out. Plate on
Channel
Casting
Bottom
1. Install new ORANGE Small
spring here. Lower VB
Plate
J
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fVWW\MMJJJl
No need to Remove
Line-up bolt

2. We need to add a hole to the small

Lower VB Plate. Use channel casting
as drill guide. Place plate on bottom of
channel using two VB bolts to line it up
as shown, then flip it over.
Use this rectangle passage as guide to
drill a 0.106” hole through lower plate
as shown with the drill bit furnished.

Have a great day!

2/17/2024 Page 6 ©TransGo 2024

 Valve Body
Identification 1/4” Ball
48RE VB’s have hole here.
Only
If the original plate does NOT 48RE’s
have this hole: have this
Use SK TFOD-DIESEL® kit. cavity.

R
TransGo 48-RE

For Snow Plow ONLY: 1/4” ball

B Make R hole .093 and install ball.

A
1. Enlarge holes A & B
with .106 drill. ReInstall Governor Sensor
original check balls. (Transducer)
Blow Air
into this Channel Casting Bottom
end. 2. Install new plate against
channel casting then gasket
and solenoid body.
Pretesting Governor Sensor
There have been numerous reports of transducers failing
shortly after overhaul. Do this simple test to weed out
any weak ones. If it passes this test, use it.
Using shop air (120-130 psi max.) blow air into the end of
the transducer. Use a rubber tip blow gun, make a good Solenoid Body Gasket New Plate
seal and listen. IT MUST NOT LEAK. Reuse
.187 Ball

2/17/2024 Page 7 ©TransGo 2024

 Reuse
1. Install New SHIM and SPRING
SEAT on PR valve before installing
new inner and outer PR springs.
PR Valve SHIM Inner PLAIN Outer ORANGE
0 0 llfW\M}JJJJ WNWffl
SPRING SEAT
Spring Adjuster
Spring
Install Spring Seat as shown. Make sure flat on spring
seat has some clearance from casting. File casting if
necessary to give it a little room to rotate slightly. Do
not allow it to bind between PR valve and casting!
Recheck this just before installing VB into case.
Fluid level checking: While
the new manual valve provides
oil to the converter in park, DO 2. PR Spring Adjustment
check fluid level in Neutral for With 3/16” allen wrench, turn adjusting screw clockwise until spring
accuracy as the converter is adjuster is just flush against the inside edge of spring retainer.
charged MORE in neutral.
Flush Here
Optional: New Boost Tuning Plate
Factory 48RE Boost hole size in the original
3. Install the new plate ranged from .052 to .073 and is plenty.
Lockup Bracket Bigger hole = More Pressure
Plug Boost ~ Is the hole already drilled too BIG?
(Leads to rough 3-4 or TCC Apply)
. . . . _ IIJJIIIIM ~
New tuning plate lets you start over. Drill to
desired size from the range above and install
UNDER the original plate, being sure to line
Stock plate hole up the hole in both plates as you tighten the
sizes vary. retaining screws.
New Boost Reuse
Original
Tuning Plate Plate.
Tech Tip: Using a triple disc converter in a
(Optional) stock daily driver can lead to rough 3-4 and/or
rough TCC complaints from your customers.

2/ 17/ 2024 Page 8 ©TransGo 2024