<html><head></head><body><div style="color:#000; background-color:#fff; font-family:Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yui_3_16_0_ym19_1_1505148119459_20250">Tim,</div><div id="yui_3_16_0_ym19_1_1505148119459_20251" dir="ltr">Are you sure its the diff not the trans? One more thing to look at only if you have an overdrive - my overdrive caused exactly that symptom once when the actuator pressure didn't leak down properly due to swarf in the tiny bleed passage. It stuck in overdrive which caused the one-way-forward over-ride clutch to engage. The driveshaft then refused to rotate in reverse. It rotated forward freely but was capable of holding off considerable reverse torque as it drove the small rollers up their ramps tighter against the clutch. Problem would go away in a few minutes as the oil bled down.</div><div id="yui_3_16_0_ym19_1_1505148119459_20553"><br></div><div id="yui_3_16_0_ym19_1_1505148119459_20569">The same could also happen if the OD lever is a little off and the OD valve is constantly engaged with the solenoid off.</div><div id="yui_3_16_0_ym19_1_1505148119459_20601"><br></div><div id="yui_3_16_0_ym19_1_1505148119459_20813">If the car's in the air you can run the engine to build pressure and manually toggle the overdrive lever to assure it clunks in and clunks out.</div><div id="yui_3_16_0_ym19_1_1505148119459_20859"><br></div><div id="yui_3_16_0_ym19_1_1505148119459_20873">Hope that helps.<br></div><div id="yui_3_16_0_ym19_1_1505148119459_20605">Gary Schneider<br></div><div id="yui_3_16_0_ym19_1_1505148119459_20252"><span></span></div><div class="qtdSeparateBR" id="yui_3_16_0_ym19_1_1505148119459_20253"><br><br></div><div class="yahoo_quoted" id="yui_3_16_0_ym19_1_1505148119459_20338" style="display: block;"> <div style="font-family: Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_ym19_1_1505148119459_20337"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_ym19_1_1505148119459_20336"> <div dir="ltr" id="yui_3_16_0_ym19_1_1505148119459_20335"> <font id="yui_3_16_0_ym19_1_1505148119459_20339" face="Arial" size="2"> <hr id="yui_3_16_0_ym19_1_1505148119459_20462" size="1"> <b><span style="font-weight:bold;">From:</span></b> timmmurphh--- via Fot <fot@autox.team.net><br> <b><span style="font-weight: bold;">To:</span></b> fot@autox.team.net <br> <b><span style="font-weight: bold;">Sent:</span></b> Monday, September 11, 2017 10:11 AM<br> <b id="yui_3_16_0_ym19_1_1505148119459_20812"><span style="font-weight: bold;" id="yui_3_16_0_ym19_1_1505148119459_20811">Subject:</span></b> [Fot] Urgent! TR4 Detroit Locker problem, locks wheels going backwards<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_ym19_1_1505148119459_20340"><br><div id="yiv9794498143"><style><!--
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--></style><div id="yui_3_16_0_ym19_1_1505148119459_20343"><div class="yiv9794498143WordSection1" id="yui_3_16_0_ym19_1_1505148119459_20342"><div class="yiv9794498143MsoNormal" id="yui_3_16_0_ym19_1_1505148119459_20341">We have a race this weekend at Elkhart Lake. Just put engine/trans back in car. Test drove on road. In trying to backup, both rear wheels are locked solid. Trying to reverse just stalls engine.</div><div class="yiv9794498143MsoNormal" id="yui_3_16_0_ym19_1_1505148119459_20344"> </div><div class="yiv9794498143MsoNormal" id="yui_3_16_0_ym19_1_1505148119459_20345">Last time the car was on the road was in May at Gingerman. No problems. Since then been sitting up in the air on the lift getting “air time” while new block being machined.</div><div class="yiv9794498143MsoNormal" id="yui_3_16_0_ym19_1_1505148119459_20346"> </div><div class="yiv9794498143MsoNormal" id="yui_3_16_0_ym19_1_1505148119459_20347">Very puzzling how sitting up in the air would cause diff problem. Car now has more “air time” on the lift than track time!</div><div class="yiv9794498143MsoNormal" id="yui_3_16_0_ym19_1_1505148119459_20348"> </div><div class="yiv9794498143MsoNormal" id="yui_3_16_0_ym19_1_1505148119459_20509">Have taken cover off diff, everything looks okay. No pieces of metal. Gear oil pretty black, has been in there about 10 years.</div><div class="yiv9794498143MsoNormal" id="yui_3_16_0_ym19_1_1505148119459_20515"> </div><div class="yiv9794498143MsoNormal" id="yui_3_16_0_ym19_1_1505148119459_20516">Both ring and pinion look okay.</div><div class="yiv9794498143MsoNormal" id="yui_3_16_0_ym19_1_1505148119459_20517"> </div><div class="yiv9794498143MsoNormal" id="yui_3_16_0_ym19_1_1505148119459_20518">Put fresh Reline gear oil in and buttoned up.</div><div class="yiv9794498143MsoNormal" id="yui_3_16_0_ym19_1_1505148119459_20519"> </div><div class="yiv9794498143MsoNormal" id="yui_3_16_0_ym19_1_1505148119459_20520">Tried again on lift.</div><div class="yiv9794498143MsoNormal" id="yui_3_16_0_ym19_1_1505148119459_20521"> </div><div class="yiv9794498143MsoNormal" id="yui_3_16_0_ym19_1_1505148119459_20522">Turning drive shaft (trans in neutral), can turn both forward and backward. Both wheels turn.</div><div class="yiv9794498143MsoNormal" id="yui_3_16_0_ym19_1_1505148119459_20523"> </div><div class="yiv9794498143MsoNormal" id="yui_3_16_0_ym19_1_1505148119459_20524">Try in driveway, same result, cannot backup, trying just stalls engine.</div><div class="yiv9794498143MsoNormal" id="yui_3_16_0_ym19_1_1505148119459_20525"> </div><div class="yiv9794498143MsoNormal" id="yui_3_16_0_ym19_1_1505148119459_20526">We could get the car back on the lift by driving forward and turning around in the cul-de-sac by the house. Did donuts in the cul-de-sac to see how diff reacted. Left two nice black marks in the donut. Accelerated forward and the diff was unlocked because there is just one long black streak. I’ll have to ask Ryan how it sounded and acted. He was driving to do that.</div><div class="yiv9794498143MsoNormal"> </div><div class="yiv9794498143MsoNormal">When car back on lift, same thing, both rear wheels locked up when trying to turn backwards last night.</div><div class="yiv9794498143MsoNormal"> </div><div class="yiv9794498143MsoNormal" id="yui_3_16_0_ym19_1_1505148119459_20534">We can make diff lock and unlock by holding one wheel and turning the other wheel forward. Not sure about specifics, wasn’t taking notes.</div><div class="yiv9794498143MsoNormal"> </div><div class="yiv9794498143MsoNormal">So far, we can make it work, sometimes on the lift, by turning the driveshaft. But once on the ground we cannot make if work under power. We could push the car backwards out of the shop but once we drove forward and tried to back up the wheels were again locked.</div><div class="yiv9794498143MsoNormal"> </div><div class="yiv9794498143MsoNormal">Any insight or suggestions will be much appreciated. Is this a typical failure mode for a Detroit Locker? Any suggestions for further examination and testing? The last time we drove the car back into the shop to put up on the lift we heard a pretty loud “clicking” noise from the diff. Never noticed this before but wasn’t necessarily listening for it before either.</div><div class="yiv9794498143MsoNormal"> </div><div class="yiv9794498143MsoNormal">Very interesting, I just tried turning the wheels with car on lift and can turn both wheels, individually, both forward and backward, no problem. It is <u>now not locked up in the backwards direction</u>. When turning one side the other side also turns <u>in the same direction</u>. It’s acting like the diff is locked up in both directions and the wheels turn in both directions. Last night, the last time we tried turning the wheels backwards it was locked up. Maybe it only works up in the air!!!!</div><div class="yiv9794498143MsoNormal"> </div><div class="yiv9794498143MsoNormal">Very puzzling!! I am not at all familiar with how the Detroit Locker works. It was the one thing on the car we never had to worry about. I guess I’ll learn something now<span style="font-family:"Segoe UI Emoji", sans-serif;">😊</span></div><div class="yiv9794498143MsoNormal"> </div><div class="yiv9794498143MsoNormal">Tim and Ryan Murphy</div><div class="yiv9794498143MsoNormal">Murphy’s Law Racing (very appropriate today!)</div><div class="yiv9794498143MsoNormal">1961 TR4 #317 BRG</div></div></div></div>_______________________________________________<br><a ymailto="mailto:fot@autox.team.net" href="mailto:fot@autox.team.net">fot@autox.team.net</a><br><br><a href="http://www.fot-racing.com/" target="_blank">http://www.fot-racing.com</a><br><br>Donate: <a href="http://www.team.net/donate.html" target="_blank">http://www.team.net/donate.html</a><br>Archive: <a href="http://www.team.net/archive" target="_blank">http://www.team.net/archive</a><br>Forums: <a href="http://www.team.net/forums" target="_blank">http://www.team.net/forums</a><br>Unsubscribe/Manage: <a href="http://autox.team.net/mailman/options/fot/garygret@sbcglobal.net" target="_blank">http://autox.team.net/mailman/options/fot/garygret@sbcglobal.net</a><br><br><br><br><br></div> </div> </div> </div></div></body></html>