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Discussion Starter · #1 ·
Hi. I have had my 2010 LTZ 5 speed auto for 18 months now, and have never been happy with the gearbox. In short, it never really locks into a gear in the way I would expect an automatic to, meaning that when you accelerate, the revs rise a lot before the car starts to respond without the gearbox changing down, like a CVT type transmission. The spacing between the 3rd, 4th and 5th gears is frankly tiny, unless you accelerate really hard, when you get a solid gear change with a noticeable drop on rpm each change. The only exception is at 75mph, when it changes gear again into a 6th gear (or maybe an overdrive!). This gear is a proper locked gear, ie if you put your foot down,the car accelerates with no "slip", however I can find no mention in any service or operating manuals of either 6th gear or overdrive. It has been back to Chevrolet 3 times, and they assure me the box is changing at the right speeds, but they can't test the 6th gear because it only operates above the national speed limit!!Can anyone confirm this is normal, and possibly shed any light on this mysterious 6th gear.
Thanks
 

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Simon, Best info I can find in Chevy Autocats database for your model (2008-2010) would seem to imply 5 gears ... but on data sheets it also mentions 'final ratio' (which looks wrong to me). Have a look at following data on shift speeds up and down tablesetc. Your model I think is the right hand column or bottom row depending on the table being viewed(2.0litre).

<DIV align=center metrikaId_0.9483464825621573="228">

<DIV align=center metrikaId_0.9483464825621573="228">

<DIV align=center metrikaId_0.9483464825621573="228">SECTION 5A


<DIV id=C5A0AT align=center metrikaId_0.9483464825621573="227">AISIN 55-51LE AUTOMATIC TRANSAXLE



<DIV metrikaId_0.9483464825621573="14">Caution : Disconnect the negative battery cable before removing or installing any electrical unit or when a tool or equipment could easily come in contact with exposed electrical erminals. Disconnecting this cable will help prevent personal injury and damage to the vehicle. The ignition must also be in LOCK unless otherwise noted.





<DIV id=C5A0SPECI align=center metrikaId_0.9483464825621573="15">SPECIFICATIONS





<DIV id=C5A0GS align=center metrikaId_0.9483464825621573="219">General Specifications



<TABLE border=1 cellSpacing=0 width="100%" metrikaId_0.9483464825621573="16">
<T =#eeeeee metrikaId_0.9483464825621573="17">
<TR metrikaId_0.9483464825621573="18">
<TD vAlign=center rowSpan=2 colSpan=2 align=middle metrikaId_0.9483464825621573="229">
<DIV metrikaId_0.9483464825621573="231">.
</TD>
<TD vAlign=center colSpan=3 align=middle metrikaId_0.9483464825621573="19">
<DIV metrikaId_0.9483464825621573="21">Definition
</TD></TR>
<TR metrikaId_0.9483464825621573="215">
<TD vAlign=center align=middle metrikaId_0.9483464825621573="216">
<DIV metrikaId_0.9483464825621573="218">FAM II 2.4D
</TD>
<TD vAlign=center align=middle>
HFV6 3.2L
</TD>
<TD vAlign=center align=middle>
2.0S DIESEL
</TD></TR></T>
<T vAlign=center align=middle metrikaId_0.9483464825621573="22">
<TR metrikaId_0.9483464825621573="152" colspan="">
<TD vAlign=center colSpan=2 align=left metrikaId_0.9483464825621573="192">
<DIV metrikaId_0.9483464825621573="193">Transaxle Fluid Type
</TD>
<TD vAlign=center metrikaId_0.9483464825621573="163">
<DIV metrikaId_0.9483464825621573="164">ESSO JWS 3309 US ATF/JWS 3317
</TD>
<TD vAlign=center metrikaId_0.9483464825621573="213">
<DIV metrikaId_0.9483464825621573="214">†�
</TD>
<TD vAlign=center metrikaId_0.9483464825621573="153">
<DIV metrikaId_0.9483464825621573="154">†�
</TD></TR>
<TR metrikaId_0.9483464825621573="23" colspan="">
<TD vAlign=center colSpan=2 align=left metrikaId_0.9483464825621573="190">
<DIV metrikaId_0.9483464825621573="191">Transaxle Fluid Capacity
</TD>
<TD vAlign=center metrikaId_0.9483464825621573="24">
<DIV metrikaId_0.9483464825621573="25">6.85 ± 0.15 L (7.24 ± 0.15 qts)
</TD>
<TD vAlign=center metrikaId_0.9483464825621573="211">
<DIV metrikaId_0.9483464825621573="212">†�
</TD>
<TD vAlign=center metrikaId_0.9483464825621573="26">
<DIV metrikaId_0.9483464825621573="27">7.11 ± 0.15 L (7.51 ± 0.15 qts)
</TD></TR></T></TABLE>


<DIV id=C5A0TGR align=center metrikaId_0.9483464825621573="4">Transaxle Gear Ratio



<TABLE border=1 cellSpacing=0 width="100%" metrikaId_0.9483464825621573="7">
<T =#eeeeee metrikaId_0.9483464825621573="8">
<TR metrikaId_0.9483464825621573="9">
<TD vAlign=center rowSpan=2 colSpan=2 align=middle metrikaId_0.9483464825621573="28">
<DIV metrikaId_0.9483464825621573="67">Gear
</TD>
<TD vAlign=center colSpan=3 align=middle metrikaId_0.9483464825621573="10">
<DIV metrikaId_0.9483464825621573="12">Ratio
</TD></TR>
<TR metrikaId_0.9483464825621573="70">
<TD vAlign=center align=middle metrikaId_0.9483464825621573="71">
<DIV metrikaId_0.9483464825621573="73">FAM II 2.4D
</TD>
<TD vAlign=center align=middle metrikaId_0.9483464825621573="165">
<DIV metrikaId_0.9483464825621573="167">HFV6 3.2L
</TD>
<TD vAlign=center align=middle>
2.0S DIESEL
</TD></TR></T>
<T vAlign=center align=middle metrikaId_0.9483464825621573="49">
<TR metrikaId_0.9483464825621573="64" colspan="">
<TD vAlign=center colSpan=2 align=left metrikaId_0.9483464825621573="65">
<DIV metrikaId_0.9483464825621573="82">First
</TD>
<TD vAlign=center align=middle metrikaId_0.9483464825621573="155">
<DIV metrikaId_0.9483464825621573="156">4.575
</TD>
<TD vAlign=center metrikaId_0.9483464825621573="188">
<DIV metrikaId_0.9483464825621573="189">†�
</TD>
<TD vAlign=center metrikaId_0.9483464825621573="194">
<DIV metrikaId_0.9483464825621573="195">†�
</TD></TR>
<TR metrikaId_0.9483464825621573="62" colspan="">
<TD vAlign=center colSpan=2 align=left metrikaId_0.9483464825621573="63">
<DIV metrikaId_0.9483464825621573="81">Second
</TD>
<TD vAlign=center align=middle metrikaId_0.9483464825621573="68">
<DIV metrikaId_0.9483464825621573="69">2.979
</TD>
<TD vAlign=center metrikaId_0.9483464825621573="168">
<DIV metrikaId_0.9483464825621573="169">†�
</TD>
<TD vAlign=center metrikaId_0.9483464825621573="196">
<DIV metrikaId_0.9483464825621573="197">†�
</TD></TR>
<TR metrikaId_0.9483464825621573="59" colspan="">
<TD vAlign=center colSpan=2 align=left metrikaId_0.9483464825621573="60">
<DIV metrikaId_0.9483464825621573="61">Third
</TD>
<TD vAlign=center align=middle metrikaId_0.9483464825621573="157">
<DIV metrikaId_0.9483464825621573="158">1.947
</TD>
<TD vAlign=center metrikaId_0.9483464825621573="170">
<DIV metrikaId_0.9483464825621573="171">†�
</TD>
<TD vAlign=center metrikaId_0.9483464825621573="198">
<DIV metrikaId_0.9483464825621573="199">†�
</TD></TR>
<TR metrikaId_0.9483464825621573="56" colspan="">
<TD vAlign=center colSpan=2 align=left metrikaId_0.9483464825621573="57">
<DIV metrikaId_0.9483464825621573="58">Fourth
</TD>
<TD vAlign=center align=middle metrikaId_0.9483464825621573="161">
<DIV metrikaId_0.9483464825621573="162">1.318
</TD>
<TD vAlign=center metrikaId_0.9483464825621573="186">
<DIV metrikaId_0.9483464825621573="187">†�
</TD>
<TD vAlign=center metrikaId_0.9483464825621573="200">
<DIV metrikaId_0.9483464825621573="201">†�
</TD></TR>
<TR metrikaId_0.9483464825621573="78" colspan="">
<TD vAlign=center colSpan=2 align=left metrikaId_0.9483464825621573="79">
<DIV metrikaId_0.9483464825621573="80">Fifth
</TD>
<TD vAlign=center align=middle metrikaId_0.9483464825621573="159">
<DIV metrikaId_0.9483464825621573="160">1.000
</TD>
<TD vAlign=center metrikaId_0.9483464825621573="172">
<DIV metrikaId_0.9483464825621573="173">†�
</TD>
<TD vAlign=center metrikaId_0.9483464825621573="202">
<DIV metrikaId_0.9483464825621573="203">†�
</TD></TR>
<TR metrikaId_0.9483464825621573="53" colspan="">
<TD vAlign=center colSpan=2 align=left metrikaId_0.9483464825621573="76">
<DIV metrikaId_0.9483464825621573="77">Reverse
</TD>
<TD vAlign=center align=middle metrikaId_0.9483464825621573="54">
<DIV metrikaId_0.9483464825621573="55">5.024
</TD>
<TD vAlign=center metrikaId_0.9483464825621573="174">
<DIV metrikaId_0.9483464825621573="175">†�
</TD>
<TD vAlign=center metrikaId_0.9483464825621573="204">
<DIV metrikaId_0.9483464825621573="205">†�
</TD></TR>
<TR metrikaId_0.9483464825621573="50" colspan="">
<TD vAlign=center colSpan=2 align=left metrikaId_0.9483464825621573="74">
<DIV metrikaId_0.9483464825621573="75">Final Drive
</TD>
<TD vAlign=center align=middle metrikaId_0.9483464825621573="51">
<DIV metrikaId_0.9483464825621573="52">2.606
</TD>
<TD vAlign=center metrikaId_0.9483464825621573="176">
<DIV metrikaId_0.9483464825621573="177">2.700
</TD>
<TD vAlign=center metrikaId_0.9483464825621573="184">
<DIV metrikaId_0.9483464825621573="185">2.397
</TD></TR></T></TABLE>


<DIV id=C5A0FC align=center metrikaId_0.9483464825621573="48">Fluid Capacity



<TABLE border=1 cellSpacing=0 width="100%" metrikaId_0.9483464825621573="32">
<T =#eeeeee metrikaId_0.9483464825621573="36">
<TR metrikaId_0.9483464825621573="44">
<TD vAlign=center rowSpan=2 colSpan=2 align=middle>
.
</TD>
<TD vAlign=center colSpan=3 align=middle metrikaId_0.9483464825621573="45">
<DIV metrikaId_0.9483464825621573="47">Capacity
</TD></TR>
<TR metrikaId_0.9483464825621573="37">
<TD vAlign=center align=middle metrikaId_0.9483464825621573="41">
<DIV metrikaId_0.9483464825621573="43">FAM II 2.4D
</TD>
<TD vAlign=center align=middle metrikaId_0.9483464825621573="38">
<DIV metrikaId_0.9483464825621573="40">HFV6 3.2L
</TD>
<TD vAlign=center align=middle metrikaId_0.9483464825621573="178">
<DIV metrikaId_0.9483464825621573="180">2.0S DIESEL
</TD></TR></T>
<T vAlign=center align=middle metrikaId_0.9483464825621573="33">
<TR metrikaId_0.9483464825621573="34" colspan="">
<TD vAlign=center colSpan=2 align=left>
Transaxle Fluid
</TD>
<TD vAlign=center metrikaId_0.9483464825621573="207">
<DIV metrikaId_0.9483464825621573="208">6.85 ± 0.15 L (7.24 ± 0.15 qts)
</TD>
<TD vAlign=center metrikaId_0.9483464825621573="35">
†�
</TD>
<TD vAlign=center metrikaId_0.9483464825621573="181">
<DIV metrikaId_0.9483464825621573="182">7.11 ± 0.15 L (7.51 ± 0.15 qts)
</TD></TR></T></TABLE>


<DIV metrikaId_0.9483464825621573="29">Notice : Fluid capacity could be changed according to the some condition, therefore be sure to check the fluid using the oil stick guage.





<DIV id=C5A0LPS align=center metrikaId_0.9483464825621573="183">Line Pressure Specification



<TABLE border=1 cellSpacing=0 width="100%" metrikaId_0.9483464825621573="133">
<T =#eeeeee>
<TR>
<TD vAlign=center width="34%" align=middle>
Application
</TD>
<TD vAlign=center width="33%" align=middle>
Idling
</TD>
<TD vAlign=center width="33%" align=middle>
Stall
</TD></TR></T>
<T vAlign=center align=middle metrikaId_0.9483464825621573="134">
<TR colspan="">
<TD vAlign=center width="34%">
At "D" range
</TD>
<TD vAlign=center width="33%">
0.33-0.39 Mpa (47.86-56.56 psi)
</TD>
<TD vAlign=center width="33%">
1.28-1.40 Mpa (185.65-203.05 psi)
</TD></TR>
<TR metrikaId_0.9483464825621573="135" colspan="">
<TD vAlign=center width="34%" metrikaId_0.9483464825621573="136">
<DIV metrikaId_0.9483464825621573="137">At "R" range
</TD>
<TD vAlign=center width="33%">
0.50-0.62 Mpa (72.52-89.92 psi)
</TD>
<TD vAlign=center width="33%">
1.71-1.99 Mpa (248.01-288.63 psi)
</TD></TR></T></TABLE>


<DIV id=C5A0SS align=center metrikaId_0.9483464825621573="13">Shift Speed



<TABLE border=1 cellSpacing=0 width="100%" metrikaId_0.9483464825621573="108">
<T =#eeeeee>
<TR>
<TD vAlign=center rowSpan=2 colSpan=3 align=middle>
Model
</TD>
<TD vAlign=center colSpan=3 align=middle>
1-2 Shift : mph (km/h)
</TD>
<TD vAlign=center colSpan=3 align=middle>
2-3 Shift : mph (km/h)
</TD>
<TD vAlign=center colSpan=3 align=middle>
3-4 Shift : mph (km/h)
</TD>
<TD vAlign=center colSpan=3 align=middle>
4-5 Shift : mph (km/h)
</TD></TR>
<TR>
<TD vAlign=center align=middle>
10% TP
</TD>
<TD vAlign=center align=middle>
25% TP
</TD>
<TD vAlign=center align=middle>
50% TP
</TD>
<TD vAlign=center align=middle>
10% TP
</TD>
<TD vAlign=center align=middle>
25% TP
</TD>
<TD vAlign=center align=middle>
50% TP
</TD>
<TD vAlign=center align=middle>
10% TP
</TD>
<TD vAlign=center align=middle>
25% TP
</TD>
<TD vAlign=center align=middle>
50% TP
</TD>
<TD vAlign=center align=middle>
10% TP
</TD>
<TD vAlign=center align=middle>
25% TP
</TD>
<TD vAlign=center align=middle>
50% TP
</TD></TR></T>
<T vAlign=center align=middle metrikaId_0.9483464825621573="109">
<TR metrikaId_0.9483464825621573="116" colspan="">
<TD vAlign=center colSpan=3 metrikaId_0.9483464825621573="117">
<DIV metrikaId_0.9483464825621573="118">55-51LE : FAM II 2.4
</TD>
<TD vAlign=center>
12 (19)
</TD>
<TD vAlign=center>
12 (20)
</TD>
<TD vAlign=center>
19 (31)
</TD>
<TD vAlign=center>
19 (31)
</TD>
<TD vAlign=center>
21 (33)
</TD>
<TD vAlign=center>
33 (53)
</TD>
<TD vAlign=center>
29 (46)
</TD>
<TD vAlign=center>
30 (48)
</TD>
<TD vAlign=center>
46 (74)
</TD>
<TD vAlign=center>
37 (60)
</TD>
<TD vAlign=center>
32 (52)
</TD>
<TD vAlign=center>
37 (60)
</TD></TR>
<TR metrikaId_0.9483464825621573="113" colspan="">
<TD vAlign=center colSpan=3>
55-51LE : HFV6 3.2
</TD>
<TD vAlign=center metrikaId_0.9483464825621573="114">
<DIV metrikaId_0.9483464825621573="115">9 (14)
</TD>
<TD vAlign=center>
10 (16)
</TD>
<TD vAlign=center>
19 (30)
</TD>
<TD vAlign=center>
17 (27)
</TD>
<TD vAlign=center>
18 (29)
</TD>
<TD vAlign=center>
28 (45)
</TD>
<TD vAlign=center>
26 (42)
</TD>
<TD vAlign=center>
27 (44)
</TD>
<TD vAlign=center>
39 (62)
</TD>
<TD vAlign=center>
35 (56)
</TD>
<TD vAlign=center>
37 (59)
</TD>
<TD vAlign=center>
53 (86)
</TD></TR>
<TR metrikaId_0.9483464825621573="110" colspan="">
<TD vAlign=center colSpan=3>
55-51LE : 2.0S Diesel
</TD>
<TD vAlign=center>
11 (18)
</TD>
<TD vAlign=center metrikaId_0.9483464825621573="111">
<DIV metrikaId_0.9483464825621573="112">11 (18)
</TD>
<TD vAlign=center>
14 (22)
</TD>
<TD vAlign=center>
19 (30)
</TD>
<TD vAlign=center>
19 (30)
</TD>
<TD vAlign=center>
25 (41)
</TD>
<TD vAlign=center>
37 (60)
</TD>
<TD vAlign=center>
37 (60)
</TD>
<TD vAlign=center>
41 (66)
</TD>
<TD vAlign=center>
52 (83)
</TD>
<TD vAlign=center>
52 (83)
</TD>
<TD vAlign=center>
55 (89)
</TD></TR></T></TABLE>
<TABLE border=1 cellSpacing=0 width="100%" metrikaId_0.9483464825621573="83">
<T =#eeeeee metrikaId_0.9483464825621573="92">
<TR metrikaId_0.9483464825621573="103">
<TD vAlign=center rowSpan=2 colSpan=2 align=middle>
Model
</TD>
<TD vAlign=center colSpan=3 align=middle>
5-4 : mph (km/h)
</TD>
<TD vAlign=center colSpan=3 align=middle metrikaId_0.9483464825621573="105">
<DIV metrikaId_0.9483464825621573="107">4-3 : mph (km/h)
</TD>
<TD vAlign=center colSpan=3 align=middle metrikaId_0.9483464825621573="104">
3-2 : mph (km/h)
</TD>
<TD vAlign=center colSpan=3 align=middle>
2-1 : mph (km/h)
</TD>
<TD vAlign=center colSpan=2 align=middle>
4th gear Min TCC Apply : mph (km/h)
</TD>
<TD vAlign=center colSpan=2 align=middle>
5th gear Min TCC Apply : mph (km/h)
</TD></TR>
<TR metrikaId_0.9483464825621573="93">
<TD vAlign=center align=middle>
10% TP
</TD>
<TD vAlign=center align=middle>
25% TP
</TD>
<TD vAlign=center align=middle>
50% TP
</TD>
<TD vAlign=center align=middle>
10% TP
</TD>
<TD vAlign=center align=middle>
25% TP
</TD>
<TD vAlign=center align=middle>
50% TP
</TD>
<TD vAlign=center align=middle>
10% TP
</TD>
<TD vAlign=center align=middle>
25% TP
</TD>
<TD vAlign=center align=middle metrikaId_0.9483464825621573="100">
<DIV metrikaId_0.9483464825621573="102">50% TP
</TD>
<TD vAlign=center align=middle metrikaId_0.9483464825621573="97">
<DIV metrikaId_0.9483464825621573="99">10% TP
</TD>
<TD vAlign=center align=middle metrikaId_0.9483464825621573="94">
<DIV metrikaId_0.9483464825621573="96">25% TP
</TD>
<TD vAlign=center align=middle>
50% TP
</TD>
<TD vAlign=center colSpan=2 align=middle>
.
</TD>
<TD vAlign=center colSpan=2 align=middle>
.
</TD></TR></T>
<T vAlign=center align=middle metrikaId_0.9483464825621573="84">
<TR metrikaId_0.9483464825621573="88" colspan="">
<TD vAlign=center colSpan=2>
55-51LE : FAM II 2.4
</TD>
<TD vAlign=center>
32 (52)
</TD>
<TD vAlign=center>
32 (52)
</TD>
<TD vAlign=center>
37 (60)
</TD>
<TD vAlign=center>
24 (38)
</TD>
<TD vAlign=center>
24 (38)
</TD>
<TD vAlign=center>
25 (40)
</TD>
<TD vAlign=center>
15 (24)
</TD>
<TD vAlign=center>
15 (24)
</TD>
<TD vAlign=center>
15 (24)
</TD>
<TD vAlign=center>
6 (9)
</TD>
<TD vAlign=center>
6 (9)
</TD>
<TD vAlign=center metrikaId_0.9483464825621573="91">
6 (9)
</TD>
<TD vAlign=center colSpan=2 metrikaId_0.9483464825621573="89">
<DIV metrikaId_0.9483464825621573="90">92 (148)
</TD>
<TD vAlign=center colSpan=2>
61 (98)
</TD></TR>
<TR metrikaId_0.9483464825621573="85" colspan="">
<TD vAlign=center colSpan=2>
55-51LE : HFV6 3.2
</TD>
<TD vAlign=center>
29 (46)
</TD>
<TD vAlign=center>
29 (46)
</TD>
<TD vAlign=center>
35 (57)
</TD>
<TD vAlign=center>
21 (34)
</TD>
<TD vAlign=center>
21 (34)
</TD>
<TD vAlign=center>
23 (37)
</TD>
<TD vAlign=center>
12 (20)
</TD>
<TD vAlign=center>
12 (20)
</TD>
<TD vAlign=center>
14 (22)
</TD>
<TD vAlign=center>
6 (9)
</TD>
<TD vAlign=center>
6 (9)
</TD>
<TD vAlign=center>
6 (9)
</TD>
<TD vAlign=center colSpan=2>
32 (52)
</TD>
<TD vAlign=center colSpan=2 metrikaId_0.9483464825621573="86">
<DIV metrikaId_0.9483464825621573="87">45 (72)
</TD></TR>
<TR metrikaId_0.9483464825621573="148" colspan="">
<TD vAlign=center colSpan=2>
55-51LE : 2.0S Diesel
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Final ratio is another way of saying diff ratio- final drive etc.
There is no 6th gear in the gearbox on this model. What you may be thinking of is torque converter lock up, which, as the name suggests, prevents the torque converter from slipping and provides direct drive, although that should happen at much less than 75mph!Edited by: bigiainw
 
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