Speaking of bell housings - Off-Road Forums & Discussion Groups
Jeep-Short Wheelbase All discussion of short wheelbase Jeeps: CJ, TJ, YJ and JK

 
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post #1 of (permalink) Old 01-15-2004, 08:02 AM Thread Starter
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Speaking of bell housings

[img]images/graemlins/tongue.gif[/img] There have been SEVERAL times when I've bought a truck or a pickup that the seller discounted because it had a terrible vibration in the drivetrain. The cause of the vibration usually turns out to be a loose yoke on the back of the main transmission, OR........the tranny is loose on the bell housing; sometimes both. Quite often I have found that on aluminum housings; and on cast iron occasionally; the tranny-to-bellhousing bolts will get loose, and then as the vehicle is driven, the tranny will rotate slightly back and forth on the bolt pattern as power is applied and then engine braking is used. That MY-NOOT amount of rotation over time can wear the register hole in the aluminum bellhousing OVAL......with the wear being on the bottom of course....and as a result of that, the clutch is run on a slight down angle. The pilot bearing gets loose enough to tolerate the misalignment, but it is real hard on the clutch driven disc and on the input bearing of the tranny. It very often breaks the center of the disc out, which is a dead giveaway that misalignment is present. I've had to add shimstock to the bottom of the register fit to get the tranny up and back into center, and of course big studs in the bellhousing holes to help hold the tranny up. This is one of those things where a vicious vibration can be corrected fairly easily if you just take a good look at how everything is fitted up, and get shims in the right places. [img]images/graemlins/wink.gif[/img] Never assume that the tranny is up and in center just because it: "Went in the hole." [img]images/graemlins/crazy.gif[/img]
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