JEGS com TH250 Shift Improver Kit Instructions

JEGS com TH250 Shift Improver Kit

Introduction

PLEASE READ FIRST

PLATE SUPPLIED FITS:
TH350 NON-LOCKUP ONLY

GASKETS SUPPLIED FIT:
TH350 & TH250 NON-LOCKUP ONLY

Identify Transmission BEFORE starting installation.

A lockup transmission has an auxiliary valve body, with a solenoid, in front of main valve body.
Note: Lockup gaskets are not provided in this kit.

A TH250 transmission has a band adjustment on the passenger side of the case toward the front and can be a lockup or a non-lockup version.

All TH250C or TH350C lockup transmissions and TH250 non-lockup units will re- use the original plate.

Note: Lockup gaskets are not provided in this kit.

A TH250 transmission has a band adjustment on the passenger side of the case toward the front and can be a lockup or a non-lockup version.

All TH250C or TH350C lockup transmissions and TH250 non-lockup units will re- use the original plate.

This is not a high performance product. It has been designed to improve the shift quality and durability of the TH350 and TH250 transmissions. It furnishes additional oil flow to areas known to warp and wear, and exhausts the cross leaks that often cause friction failure. Installing this kit on a transmission that is in good condition, or during repair, is excellent preventative maintenance.

Lockup transmissions may have a governor pressure switch here. Switches range from 38-54psi. Higher the PSI = Higher lockup speed.

Plates

• Use petroleum jelly or approved assembly gel to “stick” the gaskets & check balls to the plate for “in-car” assembly.
• [4] extra 0.250” check balls are provide

DO NOT   DRILL the new shift kit plate. For 350 Non-Lockups Only

Check ball locations with transmission installed

Shift Improver Kit Non-Lockup Plate

Hole drilling: All TH250s– Lockup or Non-Lockup & all TH350C Lockup transmissions

TH350C:
Hole 1: V6: 0.073” – 0.076”
V8: 0.076” – 0.086”
Hole 2: 0.120” – 0.147”
Hole 3: 0.110” – 0.147”

TH250 & TH250C:
Hole 1: 0.156 – 0.187”
Hole 2: 0.156” – 0.187”
Hole 3: 0.076” – 0.086”

Lockup Type Plate (Re-Use)

Lockup: Uses (5) 0.250” check balls

Assembly (TH350 Non-Lockup)

(& TH250 Non-Lockup)

1. Check balls (4) Re-use originals

2. Servo Assembly

3. Governor Filter (If equipped)

4. Pump Screen (If equipped)

5. Case Gasket (Provided)

6. New Shift Improver Kit Plate

7. New Shift Improver Kit Gasket

8. Reinforcing Plate & Bolts
   • Leave bolts loose

9. Valve body Gasket (Provided)

10. Use (2) Valve Body Bolts (“Z” Alignment”)

11. Tighten (7) Reinforcement Plate Bolts and remove “Z” bolts

12. Install Valve Body and Bolt

Check ball locations with transmission on bench
“Alignment bolt locations for plate and gaskets

Assembly (TH350 Lockup)

(& TH250C Lockup)

Order of Assembly

1. Check balls (5) Re-use originals

2. Servo Assembly

3. Governor Filter (If equipped)

4. Pump Screen (If equipped)

5. Case Gasket (Provided)

6. Modified ORIGINAL Plate

7. Reinforcing Plate, Lockup Body, Solenoid & Bolts
   • Leave bolts loose

8. Valve body Gasket (Not Provided)

9. Use (2) Valve Body Bolts (“Z” Alignment”)

10. Tighten Reinforcement Plate, Lockup Body, and Solenoid Bolts

11. Remove “Z” bolts Install Valve Body and Bolts

Check ball locations with transmission on bench
Alignment bolt locations for plate and gaskets

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