Ron's Automotive / Gregoire Racing Transmissions

Ron's Automotive / Gregoire Racing Transmissions

Ron Gregoire opened the company officially in 1983 for general automotive repair and transmissions, We carry only parts that we would run in our own cars.

After over 3 decades of operation, we have fun and take pride in building transmissions for anyone. from muscle cars, to the bracket basher that wants to run until the cows come home, to the bad ass Top Dragster, and Top Sportsman guys that enjoy pushing the limits or modern metallurgy, and hydraulic capabilities. and have aligned with some of the industries best. Such as Griner Valve Bodies, ATI, J.W., Coan, Sonnax, Precision Shifters just to name afew.


If you need help convincing you wife that your powerglide needs a freshen up after this season……
Tell her that we have pumpkin spice clutches this fall.. If that does work, let her know that we also have WhiteClaw 1st gear bands this year. 😂😂


Have you been considering a lithium battery upgrade? Send Steve a message if you are.

It's that time of the year again...Time to save some cash on GO Lithium batteries.

Wishing you and yours a great Holiday Season!!


Congrats to Dan Cassie. This weekend he won the Pro Elim. Race of Champions, AND Is the Nhra Div 1 Pro eliminator champion 2 years in a row!!!! That powergride has taken a beating this year !!


Happy 71st to my dad Ron today. He is not in the shop for once, so you guys can’t torcher him until tomorrow

Photos from Ron's Automotive / Gregoire Racing Transmissions's post 04/25/2021
Photos from Ron's Automotive / Gregoire Racing Transmissions's post 02/27/2021

Two freshen ups complete.
Shorty glide for Kristen Tavares dragster and standard glide for Dan Cassie’s Mustang are ready to turn on some win lights !


This is why you should always come see “Agent R”

We are already into January. Don’t wait until the last minutes for transmission freshen ups or trans case recerts


Ron is still out in the garage working. If you need to drop off your racing transmission or get your muscle car running right for spring please give him a call..

DISCLAIMER Ron is 70. I reserve the right to hose you down with a few cans of brake clean before coming into the shop. I don't want Dad getting sick !!


Coming soon Gang !! Ron has been working with Extreme for them to be able to produce these bad ass, fastest Transbrakes ever that we used to supply you all with until the loss of Steve Griner.

The Absolute BEST PowerGlide Valvebody ever made. We are in progress of remaking them in Exact Detail. Coming Soon.


Could go for your transmission guy too. Ron normally rocks the NBs..... like a bosss. When he does hang up the wrenches I will not be following his choose of footwear while at the transmission bench. 😆😆

It's an unspoken (possibly unintentional) uniform, but it's true.


Not to long ago I completed an odd but fun project. A 2001 Mustang, one owner car and the owner always wished he had purchased it as a stick shift. So I converted the car from an Automatic to a stock Tremec 3650. Lots of wiring to convert and replacement of the factory pedal assembly. The job came out great and looks factory!
If you are looking to do some mods this winter, give me a ring. I’m in the mood for a supercharger install, brake upgrade or some other cool project
Thanks Steve Gregoire


Ron has been working on and off on this car since 1979. He is finally done a 100 point rest-mod. His 427 GTA Mustang fastback. IS ON THE ROAD !!!


Recently we started working with Extreme Automatics to produce and repair “Griner” powerglide transbrake solenoids. We should be able to Offer them in 6 months or so. We will also be able to offer you all billet quality true PRO trans-brakes for TH-400 and powerglides. Parts will be interchangeable with old “Griner” brakes

Photos from Ron's Automotive / Gregoire Racing Transmissions's post 01/21/2019

Attention Division 1 NHRA Pro Eliminator racers. Trans-brakes are now legal for use. If you intend on putting in a trans-brake, we suggest not waiting until the last minute. It many cases it will require a modification to your torque converter as well. We ahve brakes from ATI, Griner, Coan, and many others available Plus you don't want to have to wait in line to get your stuff on the transmission bench. Just over 2 months until the race season starts !

GO Lithium the Ultimate Drag Race and Circle Track Lithium Battery ! 01/15/2019

We are looking to make a purchase with for 16v battery and charger combo packages. There would be a reasonably good discount to get in on this order. If you are interested please DM me. ( Steve Gregoire)

GO Lithium the Ultimate Drag Race and Circle Track Lithium Battery ! GO Lithium the Ultimate Drag Race and Circle Track Lithium Battery !


We ran out of red bows for gifts so last night we soaked some white ones in synthetic racing transmission fluid. Merry Christmas!!


Christmas, then New years, then Race season. Oh my ! lets get um freshened up everyone !


We pulled down the “W” last weekend at NED ! 4 races left in the season for track points


It’s the weeks before NED and LVD open. Power Glides and Turbo 400’s are flying out the door like food at a Taco Bell next to a Pot Dispensary


Powder coated and re-certified shorty PG


Public Service Announcement. Please see the picture below.
Another new customer came in the shop with his transmission that previously had an Ultra-bell “installed”.
If your current transmission builder uses the “rabid beaver” or “hammer/chisel” method for removing your stock bell-housing please just come see us first next time. A Milling machine works wonders. Lol


The 2017 is nearing its end. Good luck to everyone that will be participating in either the bracket finals or any of the fall big $$$ races. Just a reminder to everybody to check your transmission case certification expiration dates.
I know mine is up this year and I'm going to be sandblasting and powder coating the case before it goes back for certification.

15 Tips to Improve Your 727 Torqueflite Trans! 10/18/2016

Ron flashing his roots. Some know that after serving as a wheeled vehicle mechanic during Vietnam, he worked as a line mechanic at Goodall's Dodge dealership in Union CT back in the muscle car days. Rumor has it, he quit being a Dodge mechanic when the K Car came out. Who could blame him? You can't just go from Hemi's and 440 6packs to a 2.2 L turd

15 Tips to Improve Your 727 Torqueflite Trans! The Chrysler Torqueflite automatic three-speed trans is a staple for Mopar muscle machinery. Here’s 15 tips that will keep it running strong forever.


Just a heads up to all of our racing customers. Many of you had the "hot line" phone number. We changed around the phone account, and we no longer have that number. Please call 508-764-3542 to get ahold of us. Thanks everyone!!!!


The season is underway now at our home track and may others. If you happen to have a problem at New England Dragway, feel free to come see us. If we can help, we will. If its not something that can be fixed on the spot, them pull your transmission out. We will be glad to take it home on Sunday. It will definitely speed up the process in getting you ready for the next weekend. See you up there Guys, and Girls !


The off season has just begun. Ross racing, Neal Brothers, andmany others have gotten their transmissions down to us already. Its never a bad idea to get your stuff in early. Especially if its time to send your case or bell housing out for re-certification. Check those SFI dates Boys and Girls.!!!!

Timeline photos 05/18/2015

New Products just release. We are really excited for the NEW Powerglide 10 clutch high gear drums. They have 35%% more holding force then all the other 10 clutch drums on the market, and it still takes the standard size PG input shaft. no need to update to the 1" shafts. We also have a new Low servo that looks like any other billet PG servo cover, BUT also has 30% more holding force.
Take your Powerglide to the next level.!!


If your thinking about that new transmission for this season, or need a freshen up NOW would be a great time.. Once tax check start coming in, things tend to get a very busy.


Just a reminder to everyone. March is the silly season in the shop. Don't be one of the ones that waits until the last minute to get a freshen up. I will say that quite a few of you have been in already !!! I love seeing all the new "go fast" stuff that people are updating too!!!

Timeline photos 08/11/2014

We took home the hardware this Sunday in the HG Construction Top Sportsman Series


Ok, we have stopped congratulating Don Caissie on here because (quite frankly) we cant keep track. But i now know that he is at 16 finals and counting. Awesome job my friend


Great weekend spent watching the New England Nationals. Perfect weather for watching racing. A big Thank you goes out to all our customers and friends that were sporting their " Gregoire Racing Transmissions " tee shirts. It was awesome to see so many of them floating around. It did not go unnoticed. thanks everyone !!!


congrats to Dan Caissie for bringing home the hardware last night at LVD


Another Powerglide leaving this weekend, and an ATI case build starting this coming week. The hot rodders are filtering into the shop now as well. Hope everyone gets out to enjoy the weather and beat on your cars !!!


Off the bench this week. The TD Champs Neal Brothers Racing. Thanks Guys !!


FYI for everyone The synthetic transmission fluids that some people are buying at Wally-world doesn't seem to use the same formula as the same brand from the parts stores. You get what you pay for :)

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638 Worcester Street
Southbridge, MA

Opening Hours

Monday 7am - 5pm
Tuesday 7am - 5pm
Wednesday 7am - 5pm
Thursday 7am - 5pm
Friday 7am - 5pm

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