Talk:General Motors transmissions
(→TH200, TH2004R transmissions) |
(→TH200, TH2004R transmissions) |
||
| Line 379: | Line 379: | ||
1973-'85 Chevy and GMC 2WD and 4WD pickup, Blazer, G-10, G-20 van and Suburban | 1973-'85 Chevy and GMC 2WD and 4WD pickup, Blazer, G-10, G-20 van and Suburban | ||
| − | ===TH200 | + | ===TH200 transmissions=== |
| − | The TH200 was introduced during the 1976 model year | + | The TH200 was introduced during the 1976 model year. It was the first GM transmission with metric fasteners. As with the TH350/400, its a 3-speed transmission, with 1979-'87 production models using a lockup torque converter. |
| − | + | The TH200 has a one-piece case which resembles a Powerglide without a bolt-on tailhousing. The passenger side has an intermediate servo cover which resembles the 2-4 servo used with the THM700R4 / 4L60E. The TH200 also lacks a vacuum modulator, instead a cable actuated throttle valve is used to control shift points (similar to the Chrysler Torqueflite, TH2004R, and THM700R4 / 4L60). Unlike later GM automatic overdrive transmissions, the TH200 has a cast iron pump. | |
| − | TH200 | + | The TH200 (including the TH200C) have used the following bellhousing patterns: |
| + | *Chevrolet V8/inline six/90 degree V6 | ||
| + | *BOP V8 and V6 | ||
| + | *Vega/Monza Durabuilt 140 | ||
| + | *Isuzu 4 cylinder used with the GM T platform (Chevette, including the Buick/Opel by Isuzu (rebadged Isuzu Gemini) and Chevrolet LUV), | ||
| + | *2.8L V6 bolt pattern (used with the early production Chevrolet S10/GMC S-15s with a 4 cylinder (incl Tech IV) or 2.8L V6). | ||
| + | |||
| + | It is considered a light duty transmission. When used with heavier vehicles e.g. GM B or G-bodies, this has resulted in a high failure rate, and its common for the TH200 to be swapped out for a TH350. Scott McClay Engineering has improved the weak points of the TH200 by using some TH2004R internals. | ||
| + | |||
| + | *[http://scottmcclayengineering.com/ Scott McClay Engineering] | ||
====Identifying transmissions in the TH200 family==== | ====Identifying transmissions in the TH200 family==== | ||
| + | |||
| + | [[File:TH2004RBell.jpg]] | ||
Photo of a multi-pattern bell housing of a TH2004R | Photo of a multi-pattern bell housing of a TH2004R | ||
| − | |||
| − | + | [[file:Buick-2004r.jpg|300px]] | |
| − | + | Rear view of a TH2004R transmission with BOP design bellhousing bolt pattern. Notice the valley between the top two bolt holes. <br style="clear:both"/> | |
====TH2004R info==== | ====TH2004R info==== | ||
| Line 403: | Line 413: | ||
*[http://www.ckperformance.com/resources/GM2004RTRANSMISSIONS.html GM2004R TRANSMISSIONS] from ckperformance.com | *[http://www.ckperformance.com/resources/GM2004RTRANSMISSIONS.html GM2004R TRANSMISSIONS] from ckperformance.com | ||
*[http://www.t6p.com/forums/showthread.php?t=13542 Strengthening a 2004R ] from Turbo Buick Performance (t6p.com) | *[http://www.t6p.com/forums/showthread.php?t=13542 Strengthening a 2004R ] from Turbo Buick Performance (t6p.com) | ||
| + | |||
| + | ==TH2004R transmission== | ||
| + | TH2004R was introduced in 1981. It uses some internals from the TH200/200C, such as low/reverse planetaries, reaction carrier, low/reverse sprag along with improved hard parts, the durability of which had plagued the original TH200 design. The oil pump design uses pump vanes in lieu of pump gears (this design is shared with the 700R4/4L60E). As a result of the redesigned one-piece case (resembling a scaled down TH400 to accommodate the overdrive assembly) the transmission mount is located in the same location as a short tailhousing TH400. | ||
===TH400 model ID codes=== | ===TH400 model ID codes=== | ||
Your Privacy Choices