Automatic Transmission

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border-top:1px solid #393939; clear:both; display:none; width:100%!important; position:relative; z-index:999999!important; height:90px!important"> <div class="adCenterClass" style="display:block!important; overflow:hidden; width:916px;"> <div id="footerAd_container" style="display:block!important; float:left; width:728px"> <iframe id="lycosFooterAdiFrame" style="border:0; display:block; float:left; height:96px; overflow:hidden; padding:0; width:750px"></iframe> </div> </div> </div> <table cellpadding=0 cellspacing=0 border=0 height="100%"><tr> <td valign="top" width=168 BGCOLOR="#000000" TEXT="#F7F7FF" background="046a11c3.gif"> <div> <A HREF="index.htm" TARGET="_top" TITLE="Chevettes and Their Drivers"><U>Home Page</U></A></div> <bR> <div> <A HREF="id30.htm" TARGET="_top" TITLE="Transmissions"><U>Transmissions</U></A></div> <bR> <div> THM - 200 Gear Ratios</div> <div> <TABLE BORDER="2" CELLPADDING="2" CELLSPACING="1" WIDTH="139" BORDERCOLORLIGHT="#C0C0C0" BORDERCOLORDARK="#808080" FRAME="BOX" RULES="ALL" ALIGN="BOTTOM" HSPACE="0" VSPACE="0" > <tR> <tD VALIGN=TOP HEIGHT= 16 WIDTH="49"><div> Gear</div> </tD> <tD VALIGN=TOP WIDTH="71"><div> Ratio</div> </tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 16 WIDTH="49"><div> 1st</div> </tD> <tD VALIGN=TOP WIDTH="71"><div> 2.74 : 1</div> </tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 16 WIDTH="49"><div> 2nd</div> </tD> <tD VALIGN=TOP WIDTH="71"><div> 1.57 : 1</div> </tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 16 WIDTH="49"><div> 3rd</div> </tD> <tD VALIGN=TOP WIDTH="71"><div> 1 : 1</div> </tD> </tR> </TABLE></div> <bR> <div> THM - 180C Gear Ratios</div> <div> <TABLE BORDER="2" CELLPADDING="2" CELLSPACING="1" WIDTH="140" BORDERCOLORLIGHT="#C0C0C0" BORDERCOLORDARK="#808080" FRAME="BOX" RULES="ALL" ALIGN="BOTTOM" HSPACE="0" VSPACE="0" > <tR> <tD VALIGN=TOP HEIGHT= 16 WIDTH="50"><div> Gear</div> </tD> <tD VALIGN=TOP WIDTH="71"><div> Ratio</div> </tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 16 WIDTH="50"><div> 1st</div> </tD> <tD VALIGN=TOP WIDTH="71"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="16" ALIGN="bottom" WIDTH="71" HSPACE="0" VSPACE="0"></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 16 WIDTH="50"><div> 2nd</div> </tD> <tD VALIGN=TOP WIDTH="71"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="16" ALIGN="bottom" WIDTH="71" HSPACE="0" VSPACE="0"></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 16 WIDTH="50"><div> 3rd</div> </tD> <tD VALIGN=TOP WIDTH="71"><div> 1 : 1</div> </tD> </tR> </TABLE></div> <bR> </td> <td valign="top" BGCOLOR="#000000" TEXT="#F7F7FF"> <div> <FONT SIZE="5" COLOR="#99CC00" FACE="Arial" ><B>Chevettes and Their Drivers</b></FONT>     <FONT SIZE="1" COLOR="#CCCC66" FACE="Arial" >|   <A HREF="index.htm" TARGET="_top" TITLE="Chevettes and Their Drivers"><U><B>home</b></U></A></FONT></div> <div>                                                   </div> <div> <IMG SRC="045f4010.gif" border=0 width="500" height="1" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <div> Automatic Transmission</div> <div>   The chevette was equipped with one of  two different types of three speed automatic transmissions over the years. Early chevettes (1976-1978) with automatics were factory equipped with the Turbo Hydramatic 200 transmission. The THM - 200 transmission was not as well suited to the chevette platform as the Turbo Hydramatic 180-C transmission found in later chevettes. </div> <div>   </div> <div>   The THM - 200 was conceived as a way to cut some of the cost of manufacturing and was designed to absorb less horsepower so that more would be available to the rear wheels. That, of course, improved gas mileage which became a major importance in the 1970s. The 200-4R is a 200 with an overdrive section added to the front section of the trans, behind the front pump.  </div> <bR> <div>   The THM - 200 had gained a reputation as an undependable transmission early on in its life, which was mostly attributable to the early lock-up torque converter designs. The THM - 200 Transmission was no longer used in the chevette as of 1979, when it was replaced in the chevette with the THM - 180-C. </div> <bR> <div>   It is interesting to note that the THM 200 was redesigned in 1980, after the chevette had already switched over to the THM - 180-C. The original THM-200 was modified, most notably with the addition of an overdrive gearset to produce the THM 200-4R. The THM-200-4R was used in many much higher performance cars of the 1980's, notably the Buick Grand National and Turbo Regal.</div> <bR> <div>    The THM - 200 was also used in Late 1970's Cadillac Fleetwoods, Caprices, Novas, Monzas, as well as several mid to full sized GM cars. Quite a difference in size compared to the chevette!</div> <bR> <div>   All in all, the original THM - 200 was a generally weak transmission with a reputation for failure. However, in the chevette it was somewhat reliable compared to the much larger cars that the transmission was installed in. This is mostly due to the chevette's low power output which did not place a whole lot of a load on the transmission. </div> <bR> <div> <B>Gear ratios</b> of the THM 200 are: <B>2.74</b> first, <B>1.57</b> second, <B>1.00</b> third.</div> <bR> <bR> <div>   After having mixed success with the THM-200 transmission in the chevette, GM took a look at the old THM-180 transmission design and worked on making it work in the chevette. </div> <bR> <div>   The THM-180, designed in 1969, was originally called the Tri-Matic and was used in such vehicles as the GMC Caballero, and even in some early 1981-1982 Deloreans. </div> <bR> <div>   The original THM - 180 design was modified with the use of lighter internal components and a differend planetary gearset to make it more suitable for chevette use. This new, chevette - specific design was called the THM - 180-C, the "C" standing for Chevette.</div> <bR> <div>   The THM - 180-C was used in chevettes from 1978 until the final year of chevette production in 1987. After 1987, the THM - 180 was again resurrected for use in the GM S-10 based postal delivery trucks, which were produced until 1995.</div> <bR> <bR> <div>   A quick check for determining which automatic transmission is installed in a chevette (particularly 1978 chevettes which could have either the THM - 200 or the THM - 180-C is to look at the shifter console. This trick is fairly reliable, but if you need to know exactly for sure what transmission you have, check the pan. The shifter console of THM-200 equipped chevettes is large and squarish. Kind of ugly looking in a way. The shifter console of THM-180-C equipped chevettes is fairly small, and the PRND21 indicator is rounded front to back. There is a small change tray to the rear of the shifter. </div> <bR> </td> </tr></table></body>