I have a '74 Dart 318. It's got the 7 1/4" rear with 2.76 gears. I break the rear U-joint that bolts to the differential yoke every week. It's only the 2 bearing cups of the rear joint that bolt to the yoke that break. The 2 cups you hammer into the driveshaft don't break, even after the car is shaking etc. and the front U-joint that connects the driveshaft to the transmission yoke is still the original I believe. It's never broken. The car's got a hopped up 318 and i run it hard. I'm wondering if it's the yoke, or if the differential housing angles up when i hit the gas causing severe pinion angles. Help please!!
2006-07-22 23:30:09 · 5 answers · asked by Logan 1 in Cars & Transportation ➔ Maintenance & Repairs
It is odd that it is always the two on the diff. I am going to say that either the straps that hold the cups there are either too tight or too loose. If the pinion bearings are bad they can be replaced. Hope I have been helpful.
2006-07-23 00:21:59 · answer #1 · answered by king_davis13 7 · 0⤊ 0⤋
Sounds like your pinion bearing is bad. The pinion yoke is probably flopping around. Best bet is to swap rear ends. You can get the same rear end from a Diplomat or New Yorker from the early 80's when they were still RWD. Best of luck.
2006-07-23 06:41:28 · answer #2 · answered by jeff s 5 · 0⤊ 0⤋
who is installing these joints for you? is he qualified? are you using quality parts? you are putting these joints to "high performance" task, are you using "high performance" joints? is the car "jacked up" in the rear, causing severe pinion angles before you even get in the car, and are then making worse when you snap the throttle? do you have a good set of traction bars to keep "axle wrap" to a minimum? is the differential in good shape(no pinion slack)? there are a lot of variables that can play into the picture, and without seeing the car it is hard to say but here are some things to consider. also you should not be hammering these joints together, and in a round about way could be part of the problem, press them in. good luck!
2006-07-23 07:15:33 · answer #3 · answered by mark o 3 · 0⤊ 0⤋
Could be a bent driveshaft too
2006-07-23 07:10:41 · answer #4 · answered by bbbandit 2 · 0⤊ 0⤋
hi there, it is probably running out of alignment and putting strain on coupling, the harder you run it the more strain, there is a machine you usually find in good body shops which checks alignment of wheels etc. and for any twist in chassis . find one and ask if the macine could tell you what is out of alignment, jock
2006-07-23 06:49:02 · answer #5 · answered by Anonymous · 0⤊ 0⤋