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Strange rumbling noise from drivetrain

Its me again, with my 1985 Corolla AE86, RWD.

Had it in the shop for about 8 months while the driveshaft was repaired. I got it back and now there is a loud rumbling sound that is only noticable from 45-65 mph. Above and below that, its fine. It doesn't feel like its coming from the rear end of the car, but more like the front or near the tranny.

My mechanic said that there was some rear end noise that the car would inherently have for the rest of its life, because the new motor and transmission mounts and driveshaft support bearing are stiffer than the original and transmit more vibration. I don't buy that explanation, not considering the car's current state.

I know its an old piece of machinery that is going to have problems. However, it didn't have this problem before the driveshaft was replaced. and YES, this car has PLENTY of life left in it!

Thanx for responses, and thanks all for previous suggestions.

Reply to
Masospaghetti
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On 2005-07-11 snipped-for-privacy@mail.gatech.edu said: >Newsgroups: rec.autos.tech >Its me again, with my 1985 Corolla AE86, RWD. >Had it in the shop for about 8 months while the driveshaft was >repaired. I got it back and now there is a loud rumbling sound that >is only noticable from 45-65 mph. Above and below that, its fine. >It doesn't feel like its coming from the rear end of the car, but >more like the front or near the tranny. An out-of-balance driveshaft will behave that way.

Tom Willmon near Mountainair, (mid) New Mexico, USA

Net-Tamer V 1.12.0 - Registered

Reply to
twillmon

I had the driveshaft balanced multiple times from multiple shops - it never helped.

Reply to
Masospaghetti
8 months in the shop for a driveshaft repair seems like a very long time. Did they slap a boneyard shaft on your car? Have someone other than the shop that did the work check it out.

In addition to balance, look for a bad universal joint. Also, if the driveshaft is split check the support and its bearing.

Reply to
John S.

Is the rear end sagging and/or is the car lowered? You may have to check your pinion angle. Had the same issue in my old Studebaker except the speed at which it occurred was about 35 MPH (but differences in tire size or gear ratio may account for this) and some 4 degree axle shims cleared it right up.

Another thing to check would be your engine and transmission mounts, if they are worn the tailshaft of the tranny may be pointing at some cockeyed angle.

nate

Reply to
N8N

Masos, I have a 81' Corolla 3TC W/Toyoglide 3spd. I had to have the driveshaft replaced at 78,000mi because you could not replace the Ujoints.....use once and throw away driveshaft, anyway I had a industrial driveshaft shop make one for $400 and did a great job using Spicer yokes and joints plus carrier bearing(Toyota Specs.) Anyway everything seemed fine till about 48MPH to 50MPH then I heard a Rumbling sound as you described. I also had this rumbling at 65MPH too. I took the shaft back and had them recheck the balance and they said it was fine. Well I finally took the shaft to a Four wheel drive specialist and the thing that I notice right off was they mounted the WHOLE shaft on their machine with the carrier bearing clamped down. The other shop took each half and put them on the machine one at a time, but the two halfs were out phase with each other, The machanic rotated one shaft 90 degs. and Bingo!!!!! No rumbling, end of story!

Rick

Reply to
rickbenites

I will second that. It happens lots with 4x4's and backyard mechanics mixing and matching parts.

Mike

86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's

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Reply to
Mike Romain

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