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Chevy-to-BOP Transmission Adapter Plate

SAME DAY SHIPPING! Most orders ship within 24 hours.

Specs
Material Type:
Steel
Sold in Quantity:
Each
Finish:
Zinc
Hardware Included:
Yes
Overall Width:
15.750
Overall Thickness:
.125
Notes
Adapts '66 and newer Buick, Olds, Pontiac, and Cadillac TH350 or TH400 to '62 and newer Chevy engines (and vice versa). Will also adapt a 700R4 to a '70-'77 Pontiac 455.
Chevy-to-BOP Transmission Adapter Plate

Click image to enlarge

Details

Reviews (11)

Q & A (40)

What's in the Box

Info

Turbo-Hydramatic GM Transmission Adapter Plate

Adapts 1966-up Olds, Buick, Pontiac, & Cadillac Turbo 350 and Turbo 400 (TH350 or TH400) automatic transmissions to 1962-up Chevy engines (or vice versa). Will also adapt a 700R4 to a '70-'77 Pontiac 455 (however will not work on the smaller belhousings supplied on the 2.5, 2.8, and 3.1 liter engines).

Includes adapter plate and bolts. Approximately 1/8” thick.

Customer Reviews

Rated 5 out of 5 by 11 reviewers.
RATING BREAKDOWN
11 reviews
5 Stars
11
4 Stars
0
3 Stars
0
2 Stars
0
1 Star
0
RECOMMEND THIS PRODUCT:

rick
Verified Purchaser
henderson ky

easy install

June 13, 2016
Went on with no problems
Yes, I recommend this product.
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mike
Verified Purchaser
superior ne

Chevy-to-BOP Transmission Adapter Plate fit perfecly

March 22, 2016
if you knew that it was going from chevy engine to olds ,pont , ect it could use a threaded hole or a stud in the second hole down for the olds trans.
Yes, I recommend this product.
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Jim
Verified Reviewer
Phoenix, AZ

Perfect fit

March 20, 2016
I used this adapter to run a Chevy 350 with the BOP transmission in a Cutlass. It comes with the necessary hardware and was extremely easy to install. by purchasing this adapter it saved me several hundred dollars by using the BOO transmission I already had.
Pros:
  • Perfect Fit
  • Easy To Install
Yes, I recommend this product.
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Bundy
Verified Purchaser
Belleville mi.

Great quality piece ! Highly recommended !

March 15, 2016
I used this adapter as a spacer. My stall convertor needed a 1/8 th inch spacer between trans and engine to fit properly. I would recommend this product to friends for street cruisers and race cars !
Yes, I recommend this product.
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Shane
Verified Purchaser
Verified Reviewer
Osceola, PA

Excellent product and excellent service

March 14, 2016
I'm using this to connect my Olds 350 to a powerglide. Made putting this combo together easy.
Pros:
  • Finish
  • Fit
  • Quality
Yes, I recommend this product.
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homey
Verified Purchaser
Verified Reviewer
Williamstown

bop adapter

March 02, 2016
Fit great had to trim only beacause I didn't take off faceplate other than that it fit Awesome
Cons:
  • You Might Have To Trim Al
Yes, I recommend this product.
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Chuck
Verified Purchaser
Verified Reviewer
Jacksboro TN

Lid buy again

January 21, 2016
Looks beefy. I have not instead it yet waiting on warmer weather
Yes, I recommend this product.
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Bernie
Verified Purchaser
Grand Juntion, CO.

I liked the way it fit and made mounting my trans to my Buic

December 20, 2015
I am using your product to mount a 7004R trans to my 86 Buick V6 Turbo engine and put them in my 40 Chevy Pick up
Yes, I recommend this product.
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Caddy Ace
Atlanta

Looks pretty good

July 24, 2015
I haven't installed it yet but it looks awesome and sturdy. The shipping was super quick. I wasn't even expecting it for days and The next thing I know, it's at my doorstep.
Pros:
  • Shipping Was Super Quick
Yes, I recommend this product.
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alfamale
Verified Purchaser
NE

trany plate

June 08, 2015
it works
Pros:
  • It Fits Just Like It Said
Cons:
  • It Took A Moment
Yes, I recommend this product.
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Page 1 of 2

Product Q&A

40 questions : 41 answers

2 answers

I'm putting an LS 2 in my vista cruiser. With the spacer required to run a Th400 can i use this adapter plate to use my olds TH400 and not require a thicker spacer LS2 requires a spacer to run a Chevy TH400 LS2 to adapter plate to olds TH400 will it require a thicker spacer

Behnke
Sheboygan, WI, USA
March 16, 2015

I'm putting an LS 2 in my vista cruiser. With the spacer required to run a Th400 can i use this adapter plate to use my olds TH400 and not require a thicker spacer LS2 requires a spacer to run a Chevy TH400 LS2 to adapter plate to olds TH400 will it require a thicker spacer

Answers

March 20, 2015
Behnke
I emailed and got a respose back. They said using a adapter will cause no problems. All i will need to converting the old school trans to the LS is flex plate kit #399754 which makes up for the different depth crank shaft. The rest will just bolt up.
March 17, 2015
EricM
The crank converter sleeve positions the flexplate and supports the converter hub. Without mock up when using the Olds adapter plate which is 1/8” thick you may need a longer spacer sleeve. You may want to contact TCI for a correct length of spacer sleeve.
1 answers

73 Chevy Suburban 350 V8 to 70 Pontiac Catalina Transmission Believe this plate will work. What other things need to be changed to make this conversion succeed?

JimBob514
Reno, NV, USA
March 15, 2015

73 Chevy Suburban 350 V8 to 70 Pontiac Catalina Transmission Believe this plate will work. What other things need to be changed to make this conversion succeed?

Answers

March 16, 2015
EricM
Yes this adapter plate will allow you to use a Pontiac transmission on your 350 Chevy V8 engine. Be sure to check that the length of the transmission is the same, as well as the output shaft diameter spline to be sure it will be compatible with your drive shaft. If everything matches between the two then it will be a basic bolt in swap. If you are removing an TH350 transmission and installing a TH400 Pontiac transmission then you will need to alter the crossmember positioning as well as change drive shaft length and slip yoke size for the larger TH400 output shaft. Also the TH400 uses an electronic kickdown system that you would have to retrofit onto your Suburban.
1 answers

How much torque / HP can these plates handle I plan to use a built 700R4 behind a 1968 Pont 400 ci with 400 HP and 450+ lbs of torque. Will it hold up to that?

DrJones
Moyock, NC, USA
February 23, 2015

How much torque / HP can these plates handle I plan to use a built 700R4 behind a 1968 Pont 400 ci with 400 HP and 450+ lbs of torque. Will it hold up to that?

Answers

February 23, 2015
EricM
This plate does not have a power rating but it shouldn't have any issue with a 500 horsepower engine.
1 answers

flex plate problems I bolted my 72 Chevy to a Cadillac th400 but I keep breaking the flex plate I'm on my fifth one. I'm running a j.w. Performance 29.2 flex plate and only getting about 500 miles out of them. At 340 dollars a pop I can't afford to keep replacing them. Any thoughts?

ace1972
ravenna ohio 44266
November 20, 2014

flex plate problems I bolted my 72 Chevy to a Cadillac th400 but I keep breaking the flex plate I'm on my fifth one. I'm running a j.w. Performance 29.2 flex plate and only getting about 500 miles out of them. At 340 dollars a pop I can't afford to keep replacing them. Any thoughts?

Answers

November 20, 2014
EricM
If you have broken that many flex plates then you have a serious problem. You should check to make sure that the torque converter you are using will slide into the the back of the crankshaft. If not then you may be pulling the flex plate back toward the converter and putting it in a bind.
1 answers

i have a 403 olds i want to put a 700r4 on will this work for that?

buckhunter
September 16, 2014

i have a 403 olds i want to put a 700r4 on will this work for that?

Answers

September 16, 2014
EricM
Yes this will work to adapt a 700R4 to your 403 Oldsmobile engine.
1 answers

Will the adapter allow me to bolt a small block Chevy 305 to a Pontiac 350 trans

Getlo
Tampa, FL, USA
September 11, 2014

Will the adapter allow me to bolt a small block Chevy 305 to a Pontiac 350 trans

Answers

September 11, 2014
EricM
Yes this will work to bolt a Chevy 305 engine to a Pontiac transmission.
1 answers

Will I be able to mount a Chevy 700r4 to an Olds 307 In a Chevy Caprice Classic Wagon?

snowblaster
September 10, 2014

Will I be able to mount a Chevy 700r4 to an Olds 307 In a Chevy Caprice Classic Wagon?

Answers

September 10, 2014
EricM
Yes this adapter will allow you to bolt an Olds 307 engine to a 700R4.
1 answers

will this adapt a 400 pontiac to a 700r4?

augielogs
August 06, 2014

will this adapt a 400 pontiac to a 700r4?

Answers

August 06, 2014
EricM
Yes this will adapt a 700R4 transmission to your 400 Pontiac V8 engine.
1 answers

will this allow me to bolt a buick th400 to and lsx engine 5.3L engine needs to be bolted to a th400 out of a 1965 buick wildcat

kayhawk
louisiana
July 07, 2014

will this allow me to bolt a buick th400 to and lsx engine 5.3L engine needs to be bolted to a th400 out of a 1965 buick wildcat

Answers

July 07, 2014
EricM
You may be able to utilize this adapter plate to mate your Buick 400 to your LS but you will definitely need the flaexplate and adapter sleeve number 57534610 and 57518346 to mate the converter to the crankshaft. The flexplate bolts if needed are number 1012442901.
1 answers

Will this adapter allow a proper connection between a Buick 455 and a Saginaw/Muncie currently mounted to a small block Chevy? Planning on taking out my worn out Chevy 350 and putting in a Buick 455

ChrisH87
Cheyenne, WY, USA
January 17, 2014

Will this adapter allow a proper connection between a Buick 455 and a Saginaw/Muncie currently mounted to a small block Chevy? Planning on taking out my worn out Chevy 350 and putting in a Buick 455

Answers

January 20, 2014
EricM
Yes this adapter plate can work to adapt your Saginaw/Muncie manual transmission to a Buick 455. Typically people that do that sort of swap with a manual transmission would locate a Buick bell housing for a manual transmission so that no adapter is required.
Page 1 of 4

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