1991 olds 88 4L60 shudder?? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 09-10-2006, 11:50 AM
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1991 olds 88 4L60 shudder??

Hello people...........I am still wondering where to go with this, I have read that engine misses at low rpms can cause shudders, and I have also read that torque converters can give a shudder under lockup.........vibrations occur at 35 to 42 and at 55 to 65..........each time the rpm is under 2 grand.......I did the unplug the converter thing and vibs went away.........but if I have an engine miss, then I am masking the problems as noted by a post on here directing people to a transmission site that says if you have an engine missfire....it is very possabe to swear that you have torque shudder......fix the misfire and shudder goes away.........was noted that coil packs degrade causing 2 cylinders to missfire......well.....since I havnt found somone that will help me locally yet, I am still in the dark as to what to pinpoint........sometimes I think converter and then I read the missfire statement and still have no clue........I cannot duplicate the problem in the driveway.......I did take it to a shop but he didnt do anything like put it on a scope, just revved the motor in drive and park, then said nothings wrong

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Old 09-10-2006, 09:48 PM
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A 1991 Olds will not have a 4L60 tranny.

I do believe it is a front wheel drive car.

your description indicates a converter clutch slip / shutter.

No trouble codes? No SEL in the dash?

A service and fresh filter may help. A product called Lube Gard in red bottle will help if the damage is not major to the converter clutch lining.

Could even be a leaking TCC solenoid not allowing full pressure for lockup application.

how many miles on tranny?

Original tranny to the car??
Dont worry how old you are... it is the mileage on your body that adds up.
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Old 09-11-2006, 10:47 AM
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117,000 on it, changed filter once, not much crap in pan, oil was not red, but not burnt in smell...........changed oil by sucking it out of dipstick tube in pan 4 times,,,,not sure about original tranny since it has a sticker on it that says service replacement transmission assembly, with the general motors symbol.........and yes its fwd..........and i called a tranny shop and they said it is a 440 tranny..........it has overdrive and of course lockup

Last edited by fumplet; 09-11-2006 at 10:52 AM.
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Old 09-11-2006, 11:34 AM
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How many different threads do you have going on for this problem?

In the other thread I thought we had it narrowed down to the torque converter or trans.

If it is the torque converter or trans that's why you cannot duplicate the problem in the driveway. Torque converter shudder can sometimes be cured with a trans flush, and then using an additive to the fluid.

Is this a nice enough car to warrant a trans and or torque converter replacement? If not drive it till it dies .

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Old 09-11-2006, 01:03 PM
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Yes I do have several threads.......true.and I thought we did too have it n arrowed down........well I took it to several more people and the trans people said....nope, not a torque converter/lockup issue,.........and the mechanics said nope, not a miss............last mechanic said possable worn struts, tires out of balance............I know the rear drums are suspect to balance issues as well as I think they might be out of round(brakes applied).......rear struts are almost gone(bounce on car, dribble it like a basket ball)...........now I have a lot of people pointing me in the right direction............on this site has helped emmensly........2 trans guys said trans is good.......so since I know I will be replacing the struts, and rebalance tires.....I will wait for that..............the last trans guy suggested that lockup problems are.........going in and out of lockup repeatedly and it feels like going over rumble strips.............my issues dont feel like that..I have also learned that 4L60 is rear wheel drive.......440T4 or 4T60 is frontj..........the last mechanic shut off the engine while driving.....vibration still there, he said engine continues to pull..........so if after I get the struts installed(done myself).....it will at least have a better ride, and might solve the prob.....if not.....then back to finding more people to test drive it....will let ya know when struts replaced.........that will cost over 200 bucks......or over 500 bucks done by someone else......your extensive help is so greatly appreciated
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