TH350 / TH250
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Part #
Reference #
Repair kits
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OH TH350 69-86 Transtec
- Part #
- DP2403
- Reference #
- 44002D
- Extra information
MO TH250C
- Part #
- K3500Z-MD
- Reference #
- 44006A
- Extra information
- Master Overhaul Kit = OH-kit + Frictionkit + Steelkit
Frictionpack HP TH350 Raybestos Red Stag
- Part #
- RCPS-02
- Reference #
- 44119HP
- Extra information
Frictionpack TH350 HP Blue Raybestos
- Part #
- RCPBP-02
- Reference #
- 44119S1
- Extra information
- The Gen2 Blue Plate Special, the ultimate racing clutch for automatic transmissions, is the perfect clutch for ALL TYPES of racing. It features an improved Raybestos-developed material that offers optimum shifting at a level above standard racing clutches. It provides a positive engagement under high power conditions where all of the energy absorption is condensed into a very short length of time. Gen2 is a state-of-the-art, power absorbing clutch that performs with very low wear, excellent fatigue strength, high durability and quick shifts with little shock for even faster times.
Shift Correction pack TH350
- Part #
- K350-WP
- Reference #
- 44165
- Extra information
- 350 Kit with separator plate (Superior K350-WP ) Shift Correction Package This valve body kit deals with these problems: * Erratic passing gear * Premature clutch failure * Premature band failure * Erratic shift points * Weak shifts * Includes new separator plate to replace worn out O.E. plate 1. This Shift Correction Package offers regular, heavy duty and towing applications all in one package. 2. This valve body kit services 350 and 250 lock-up and non lock-up units. It contains parts to convert a 350 lock-up back to a 350 non lock-up. 3. Lube modification for heavy duty units is shown in the kit to prevent loss of converter lube under heavy throttle.
Shift Kit Transgo TH350
- Part #
- K35908
- Reference #
- 44165
- Extra information
- TRANSGO PART: SK 350 CLASSIFICATION: SHIFT KIT FITS: THM 350,250 Lock Up and Non lock Up 69-86 FEATURES: Corrects/Prevents/Reduces: Falls out of high when hot. 3rd clutch failure; soft, late shifts; cross leaks.
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Filters
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Valvebody Components / Transmission Specialties
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Line Press. Booster TH350
- Part #
- 350-LB1
- Reference #
- Extra information
Line Press. Booster TH350
- Large Ratio Boost Assembly
- Pressure Regulator Spring
Sonnax hydraulic line pressure booster kits contain stronger pressure regulator springs and large ratio boost valves designed to work together to provide progressive pressure increases as driving conditions become more demanding.
Our pressure regulator springs are approximately 10% stronger than OE and more conservative in impact than other aftermarket kit springs. Large ratio boost valves provide higher pressure incrementally and when it is needed the most. The combination of these springs and valves in a Sonnax kit gives you the best of both worlds: a modest pressure increase at the low end, with a high-end pressure that is equal to or greater than that of other aftermarket kit springs.
- Achieve shorter shifts and increased torque capacity without creating low-speed harshness
- Improved band and clutch holding capacity for increased durability
- Progressive pressure increase as driving conditions become more demanding
- All the benefits of increased line pressure without overloading the pump at idle
- Simple and affordable drop-in solution with no special tools or reaming required
Case rep.sleeve TH350
- Part #
- 35709-01K
- Reference #
- Extra information
Case rep.sleeve TH350
- Servo Piston
- Sleeve
- PTFE Seal
The intermediate servo bore becomes scored from repeated cycling. The spring side of the piston has line pressure present in R, N, D. Excess leakage at the servo piston results in low line pressure and delayed engagements. During forward speeds, oil loss affects shift quality and reduces clutch life. To salvage cases install Sonnax intermediate servo sleeve kit 35709-01K.
- Kit contains an aluminum sleeve and a replacement piston with a PTFE seal.
- This kit is a simple drop-in solution and requires no machining of the transmission case.
Symptoms: - Delayed engagement
- Low line pressure in Drive
- Low line pressure in Neutral
- Low line pressure in Reverse
- No engine braking in manual 2nd
Cause:
Case bore wear and oil loss at the intermediate servo.
Correction:
This drop-in sleeve and piston salvages the case, and eliminates the complaints caused by oil loss.
Acc.pin+ruimer TH350 [10]
- Part #
- 35718-02K
- Reference #
- Extra information
Oversize accumulator pin and Reamer kit
- Pins (10)
- Small Retaining Rings (10)
- Medium Retaining Rings (10)
- Reamer
A burned or complete failure of the direct clutch on the THM 350 transmission can be created by accumulator cross leaks. A drivability complaint of a long slide on the 2-3 shift can result from excessive piston wear. These complaints can be caused by oil cross leakage between the piston and pin in the front accumulator assembly located in the valve body. Excess wear is due to the constant oscillating motion of the the aluminum accumulator piston on the steel pin. The problem occurs when direct clutch oil and intermediate circuits cross leak. In second gear a cross leak may drag the direct clutch and create premature failure. Starter kit 34105-02K contains 10 pins, 10 retaining rings, and 1 reamer.
- The working diameter of the pin is slightly oversized, allowing the bore of the accumulator piston to be modified to restore the hydraulic integrity of the assembly.
- Kit contains an extra retaining clip to assist in holding the accumulator pin in the valve body, which is much less expensive than replacing the accumulator piston and more durable than a bushing.
Symptoms: - 2-3 Slide
- Direct clutch burned
- Failed direct clutch
Cause:
Oil cross leakage at a worn accumulator piston bore pin.
Correction:
The oversized accumulator pin allows the piston pin bore to be reamed to restore hydraulic integrity.
Acc.sleevkit TH350 1-2accum
- Part #
- 35719-01K
- Reference #
- Extra information
Acc.sleevkit TH350 1-2accum
- Aluminum Sleeve
- Piston
- PTFE Seals (2)
The 1-2 accumulator bore in the 350 cases can become worn or scored from repeated oscillation during normal operation. This can result in delayed engagements and 1-2 slip from low line pressure, which could cause intermediate clutch failure. Once the bore is damaged the case must be thrown away. Sonnax has designed a 350 1-2 accumulator sleeve rebuild kit 35719-01K, which contains everything necessary to rebuild your 1-2 accumulator, except for the OE spring, snap ring and cap.
- This kit is a simple drop-in solution and requires no machining to the transmission case
- Salvages cases
Symptoms: - 1-2 Slip
- Delayed Forward
- Delayed Reverse
- Destroyed case
- Intermediate clutch failure
- Low line pressure
- Worn accumulator bores
Cause:
The 1-2 accumulator bore becomes worn or scored from repeated oscillation during normal operation.
Correction:
This drop-in sleeve and sealed piston kit restores hydraulic integrity and saves worn cases.
Boostvalve HP TH350
- Part #
- 35754-01K
- Reference #
- Extra information
Boostvalve HP TH350
- Sleeve
- Reverse & Modulator Boost Valve
- Intermediate Boost Valve
The OE boost valve sleeve wears out from the reciprocation of the steel valve within the aluminum sleeve. Wear in the reverse boost sleeve results in low line pressure, soft 1-2 and 2-3 shifts and/or reverse engagement or shudder. Sonnax offers 35754-01K, a high performance boost valve and sleeve replacement. This high performance boost valve and sleeve incorporates a larger boost ratio, which increases line pressure and provides firmer shifts. It is also recommended for street/strip performance vehicles.
- Redesigned sleeve prevents sticking
- Larger boost ratio
- No machining required
Acc.cover TH350 No-leak
- Part #
- 35988-01K
- Reference #
- Extra information
Acc.cover TH350 No-leak
- Cover
- O-Rings (2)
Sonnax now offers 35988-01K, a machined aluminum accumulator cover for use in any GM 350 application. Machined from billet aluminum, this part provides a strong yet lightweight alternative to OE accumulator covers. The dual O-ring design eliminates leaks and ensures the cover stays in position when used without an accumulator spring.
- Machined from billet aluminum
- Cover will not fall outof position like OE covers
- Dual O-ring design prevents leaks
- Can be used with or without accumulator spring
Manual shaft TH350
- Part #
- 35801-02K
- Reference #
- 44991-4
- Extra information
- Symptoms: Leaking manual shaft case seal Repeat leakage Scored shaft Cause: Recurring shift shaft seal leakage due to shaft scoring and wear. Correction: Stop chronic leaking by installing Sonnax shift shaft and seal kit.
Checkball repair kit
- Part #
- 96-350VB
- Reference #
- 74741
- Extra information
- Fitzall: VB-101
Reprog.kit TH350
- Part #
- 350-1-2
- Reference #
- T44171
- Extra information
- TRANSGO PART: 350-1&2 CLASSIFICATION: REPROGRAMMING KIT FITS: THM 350 69-up FEATURES: Automatic shift; Street or Full-race; Holds 1st, 2nd and 3rd to any rpm; Backshifts to 3rd, 2nd and 1st at any rpm. Tow & Go and Competition combination. Does not fit lockup transmissions. Special Instructions: Does not require transmission removal for proper installation.
Part #
Reference #
Frictions
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Friction TH350 Forward, Direct [5,5]
- Part #
- 512251
- Reference #
- 44106
- Extra information
- Thickness: 0.088''/2.24mm. 20 Teeth.. Outside diameter: 5.910"150.114mm.
Friction TH250C Forward/Direct [5]
- Part #
- 032722
- Reference #
- 44106B
- Extra information
Friction TH350 L&R / Powerglide Rev [5]
- Part #
- 019702
- Reference #
- 44414
- Extra information
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Reference #
Steels
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Reference #
Bands
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Reference #
Bushings
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Bushing Pump TH350/TH400/Powerglide Tefl
- Part #
- 34034T-01
- Reference #
- 44034
- Extra information
Bushing Pump TH350/400/Powerglide
OE Part No: 29511860
- Width: 0.615"
- Housing Bore: 2.001"
- Shaft Dia.: 1.873"
- Bushing Style: Precision
- Material: Steel-backed bimetal
Worn babbit pump bushings in GM Powerglide, 350, 400 and Allison® AT540 units allow the converter hub and inner pump gear to move off-center, causing damage to the pump gears and pump housing crescent. Sonnax pump bushing 34034T-01 is a direct replacement part that is better fitting than OE. Extremely wear-resistant, this PTFE-lined Kryptonite bushing helps maximize the life of these older and increasingly rare pumps.
- Highly wear-resistant PTFE lining for maximum durability
- Tight tolerance for improved fit
- Longer pump life
- Direct replacement part with no machining required (including Allison Part No. 29511860)
Bushing TH350, TH400 Gov.bore repair
- Part #
- 30104A
- Reference #
- 44064B
- Extra information
Part #
Reference #
Seals
Qty
Seals for 35719-01K TH350
- Part #
- 35719-SK
- Reference #
- Extra information
Replacement Seal Kit
For 35719-01K
The 1-2 accumulator bore in the TH350 cases can become worn or scored from repeated oscillation during normal operation. This can result in delayed engagements and 1-2 slip from low line pressure, which could cause intermediate clutch failure. Once the bore is damaged the case must be thrown away. Sonnax has designed a 350 1-2 accumulator sleeve rebuild kit 35719-01K, which contains everything necessary to rebuild your 1-2 accumulator, except for the OE spring, snap ring and cap.
- Seals, Large (10)
- Seals, Small (10)
Seal Pump TH180,TH350,TH400 PowerGlide
- Part #
- 38151L
- Reference #
- 44070
- Extra information
Seal EXT.TH700-R4, TH350, RWD
- Part #
- 8850A
- Reference #
- 74074
- Extra information
- 1243402, 1251450, 3871649, 3932255, 24204540
Fillertube seal 350/125/180/700/4L80
- Part #
- 51405
- Reference #
- 74379
- Extra information
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Reference #
Gaskets
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Reference #
Washers & Bearings
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Bearingkit TH350 65-85
- Part #
- K35907B
- Reference #
- 44201A
- Extra information
- Bearing Kit 1969-1985 Contents Internal Clutch/Oil Pump (2) Use as Sub. for FB-42313 (9428664) from 6983,Output Ring/Reaction Carrier 8485 Output Shaft/Case Buick Friction Ring/Output Carrier
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Reference #
Electrical Components
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Connector 700/TH350/4L30E square 4pts
- Part #
- 25A-104
- Reference #
- 74444
- Extra information
- 96015409
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Reference #
Sprags & One way clutches
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Race interm.Outer TH350 Heavy Duty
- Part #
- 35723HD-02
- Reference #
- 44663
- Extra information
- Heavy Duty Intermediate Overrun Clutch Outer Race Part No. 35723HD-02 OE Part No. 6261021
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Reference #
Hard Parts
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Accum.pin TH350 Oversized [4] NLA
- Part #
- 35718-01K
- Reference #
- Extra information
Accum.pin TH350 Oversized [4]
- Pins (4)
- Small Retaining Rings (4)
- Medium Retaining Rings (4)
A burned or complete failure of the direct clutch on the THM 350 transmission can be created by accumulator cross leaks. A drivability complaint of a long slide on the 2-3 shift can result from excessive piston wear. These complaints can be caused by oil cross leakage between the piston and pin in the front accumulator assembly located in the valve body. Excess wear is due to the constant oscillating motion of the the aluminum accumulator piston on the steel pin. The problem occurs when direct clutch oil and intermediate circuits cross leak. In second gear a cross leak may drag the direct clutch and create premature failure. Install the Sonnax oversized accumulator pin 34105-01K. Starter kit 34105-02K contains 10 pins, 10 retaining rings, and 1 reamer.
- The working diameter of the pin is slightly oversized, allowing the bore of the accumulator piston to be modified to restore the hydraulic integrity of the assembly.
- Kit contains an extra retaining clip to assist in holding the accumulator pin in the valve body, which is much less expensive than replacing the accumulator piston and more durable than a bushing.
- Starter kit 35718-02K, also available, includes 10 pins, 20 rings and one reamer.
Race TH350 INT HD
- Part #
- A44663HD
- Reference #
- 44663HD
- Extra information
- Intermediate Overrun Clutch Outer Race The outer race of the intermediate overrun clutch is prone to cracking in higher torque load applications. Aftermarket versions are typically less reliable than original OE version. This heavy-duty race begins as a salvaged OE part, then undergoes additional hardening processes and other treatments making it one of the most durable replacement races available. Case-hardened inner diameter Alloy steel
Part #
Reference #
Various
Qty
Fillertube TH200, H200-4R,TH350,TH400
- Part #
- K35999T
- Reference #
- 44494
- Extra information
- 200,200C,20-R4,350,350C AND 400
TV-cable TH350, TH200
- Part #
- 81-1000
- Reference #
- 44497
- Extra information
- Telescoping design fits 95% of all GM transmissions. Does not fit firewall mount. Fits 200 & 200C, 76 to 80, 250, 250C, 350, 350C 69 to 87. k35951
Case Fix TH350/TH700
- Part #
- 44631
- Reference #
- A74761DAC
- Extra information
- Intended for use as a case-saver, our A74761DAC is a new twist on a resurrected idea. TH350 cases are no longer plentiful nor as cheap as they once were. 4L60E cases have many variations throughout the years. Either application requires replacement when the case lugs are worn. You can now save your case and improve on the original design! A74761DAC fits like OE. After installing your 87-UP 4L60 roller clutch and inner race, align outer lugs and set into place. Install the case snap ring. Next, align outer lugs and set the retainer plate in. Install and tighten six allen-head screws to 100-110 inch-pounds. Our A74761DAC utilizes the wide 87-up roller clutch assembly providing more holding power than the early narrow TH350. Used as a case saver or an upgrade, you’ve been introduced to the strongest-known center support ever available for these applications!
Cabel rep.TH350, TH200
- Part #
- K35909
- Reference #
- T44451DC
- Extra information
- Small GM Detent Cable Repair End Lower 69-87 Fits 350 & some 200 Cables
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Reference #
Torque Converters
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Converter Rebuild TH350 12" 3 brackets
- Part #
- GRC-TH350-01
- Reference #
- Core charge
- €80.00
- Extra information
- Chevrolet 1969-79 8 cyl.
Converter Rebuild TH350C Lockup
- Part #
- TC-B16
- Reference #
- Core charge
- €80.00
- Extra information
- Corecharge 80,-
Converter Rebuild TH350 12" 3 brackets C
- Part #
- TC-B35
- Reference #
- Core charge
- €80.00
- Extra information
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Complete transmissions
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