1976 Transmission
Thread Starter
Burning Brakes
Joined: Jan 2006
Posts: 1,223
Likes: 174
From: Fort Wayne IN
1976 Transmission
I'm having trouble finding out who made the wide ratio 4 speed for the 76.
From what I can find, the automatic was made by Saginaw, the close ratio was a Muncie CH465, and the wide ratio was either made by Saginaw or Borg Warner.
I also found that the close ratio was only offered with the L-82 engine. Mine came as an L-48, so it has to be the wide ratio.
Anyone know? Is it part of the VIN or other code? Am I going to have to break out the engine brite and look at the stamp?
From what I can find, the automatic was made by Saginaw, the close ratio was a Muncie CH465, and the wide ratio was either made by Saginaw or Borg Warner.
I also found that the close ratio was only offered with the L-82 engine. Mine came as an L-48, so it has to be the wide ratio.
Anyone know? Is it part of the VIN or other code? Am I going to have to break out the engine brite and look at the stamp?
Le Mans Master
Joined: Mar 2004
Posts: 7,470
Likes: 1,491
From: Little Rock AR
The Muncie trannys were not supplied after mid '74. You may already know this other stuff but some folks might not.
Borg Warner Super T-10's were used in '76. You can tell by the stamping what you have in there. The prefix will be "W" for Warner. Warner wide ratio was standard. The "M-21" close ratio option (for L-82 only) was also a Borg Warner in '76.
Part of the confusion comes fom Chevrolet using the "M-20, M-21" type option codes as a "Generic" description. It can mean a totaly different manufacturer depending on the year model and the engine in front of it. "M-20" is generic for wide ratio 4-speed and "M-21" is generic for close ratio 4-speed.
For example: The "M-20" in a 74 Vette could have been sourced from Borg Warner or Muncie depending on the production date. Early cars got Muncie, later production got Borg Warner.
This generic description applies to other models and other years. in some years it depended on the engine option. You would get a Saginaw "M-20" tranny with a base engine (or 6 cylinder) while they supplied a Muncie "M-20" with a SS 396.
I hope that was the question.
-Mark.
Borg Warner Super T-10's were used in '76. You can tell by the stamping what you have in there. The prefix will be "W" for Warner. Warner wide ratio was standard. The "M-21" close ratio option (for L-82 only) was also a Borg Warner in '76.
Part of the confusion comes fom Chevrolet using the "M-20, M-21" type option codes as a "Generic" description. It can mean a totaly different manufacturer depending on the year model and the engine in front of it. "M-20" is generic for wide ratio 4-speed and "M-21" is generic for close ratio 4-speed.
For example: The "M-20" in a 74 Vette could have been sourced from Borg Warner or Muncie depending on the production date. Early cars got Muncie, later production got Borg Warner.
This generic description applies to other models and other years. in some years it depended on the engine option. You would get a Saginaw "M-20" tranny with a base engine (or 6 cylinder) while they supplied a Muncie "M-20" with a SS 396.
I hope that was the question.
-Mark.
Le Mans Master
Joined: Mar 2001
Posts: 6,640
Likes: 287
From: Ann Arbor Michigan
Should be a Borg Warner (9 bolt side plate) Stamped on the case should be a 6 character code (like WK0361) W=Warner, K=month built (oct) 03=Day built (3rd) 6=year built (1976) 1=1st shift. The Automatic was a Turbo Hydra-Matic 350. Probably more info than you wanted.
Muncie has 7 bolt side plate.
Muncie has 7 bolt side plate.
Last edited by Duke94; Aug 5, 2006 at 12:44 PM.
