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GM 2.8/3.4 V6 TH350/2004R/700R4/4L60 Transmission Adapter Plate
GM 2.8/3.4 V6 TH350/2004R/700R4/4L60 Transmission Adapter Plate
Speedway Motors

|

#91628907

GM 2.8/3.4 V6 TH350/2004R/700R4/4L60 Transmission Adapter Plate

  • Mates 60° Chevy V6 to Chevy Turbo 350 transmission
  • Approximately 1/8” thick
  • For TH350 transmission application
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$73.99

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Product Summary

2004R, 700R4, TH350

  • Mates 60° Chevy V6 to Chevy Turbo 350 transmission
  • Approximately 1/8” thick
  • For TH350 transmission application
  • Constructed of the finest steel material and will seal where most gaskets fail
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Key Specs

MFG. Part #91628907
BrandSpeedway Motors
See more specs

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Speedway Motors 91628907 Details

Mates 60° Chevy V6 to Chevy Turbo 350 transmission. Approximately 1/8” thick. For TH350 transmission application.

Application

The "T" or mushroom shaped adapter is the converter adapter. The small end presses into the rear of the V6 crank and the larger I.D. then serves as the pilot for the center hub of the 350 torque converter.

GM used 2 bolt circles for their torque converters (10.75" and 11.5") and most V8 flywheels are double drilled to accept either bolt pattern. Some heavy duty applications, like TH400 big block trucks, used the larger bolt pattern. The V6 flywheel should share the standard small bolt circle of the TH350 converter.

On some applications it may be necessary to drill new (or slot the existing) holes in the V6 flywheel to match the torque converter used. The pilot adapter keeps the converter centered in the rear of the crankshaft, the bolts do not perform that function. It is not a difficult operation, and can be accomplished at home with a drill press, or by any competent machinist. Instructions are included.

The small round machined piece is the center adapter for the torque converter pilot hub. The fastener pictured is a special flush head bolt which must be used on the lower passenger side corner of the adapter for clearance in the dowel pin area.

Charts

Speedway Motors 91628907 Specifications

KEY SPECS
MFG. Part #91628907
BrandSpeedway Motors

Ratings & Reviews

4.9

10 Reviews

Overall Assessment

Customers consistently highlighted the product's perfect fit, robust functionality, and versatility as standout attributes. Many users noted it solved their transmission compatibility issues, allowing various engine and transmission combinations to bolt together seamlessly. Its practicality was lauded, with the product being deemed a time and frustration saver due to flawless adapter bolt fittings, aiding in different car modifications. Its quality was verified by the perfect fit and finish. The product, characterized as great and reasonable priced, was frequently recommended over competitor options. Please note one caution: while the adapter bolted up, there were noted challenges regarding limited room for a flexplate and torque converter in small bellhousing setups.

Write A Review

4.9

10 reviews

5

9

4

1

3

0

2

0

1

0

Filter by Ratings

Holden v6 to th400

5.0

10 months ago

Mr king

Australia

Verified

Hello mates from Australia this works for mating a th400/350 or glide to our l67 or v6 Ecotec very cheap great product

Would Recommend

Customer review image

Looks good worked perfect

5.0

5 years ago

Badbowtie riley

Norfolk ne

Verified

Used it to put th350 behind a 2.8 v6

Would Recommend

Yes

5.0

6 years ago

Debbie

Indiana

Verified

They had the part that I needed. The customer service is great.

Would Recommend

This adapter solved my problem

5.0

7 years ago

Sparky

ON

Verified

Fit and finish is perfect.allowed the use of a 90° sbc bolt pattern th700r4 transmission to bolt to a 60° cadillac 4.9 engine.works perfectly.

Would Recommend

Adapter Plate Fit Was Perfect

5.0

7 years ago

RogueDave

Waterloo IA

Verified

Would recommend to anyone..

Speedway treats you right.

4.0

7 years ago

Mike

Valley City ND

Verified

Exactly what I ordered

Saved time and frustration

5.0

8 years ago

Thamesvan

Oklahoma

Verified

Adapter bolted up perfectly. I actually used it to bolt a Chevy metric trans to a Pontiac block

Would Recommend

v6 th350 adaptor

5.0

10 years ago

joeo3800turbo

quakertown pa

Great product. Working awesome mounting my th350 to a v6 with the 60 degree housing...so worth it

Would Recommend

Great product

5.0

10 years ago

Robthezukman

Williams az

Verified

Great product and reasonable priced

Would Recommend

great to deal with

5.0

14 years ago

david

roanoke, va

Verified

this was a trial too see if the adapter would mount a 60 degree 700r to 305 it will bolt up but no rom for flexplate and torque converter in small bellhousing [...] very pleased with Speedwaythanksdavid

Would Recommend

Showing 10 of 10 reviews

Fitment

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Customer Impersonation Script