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Old 05-28-2015, 04:46 PM
67Chvl67 67Chvl67 is offline
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Default The 67 needs some differential work...

This car is new to me. I've been noticing noise and vibration lately, after getting the rear on jacks found my problem. The bearing at the yoke is toast, tons of play. Since I'll be spending money on the bearing repair figure its a good time to change gear in the rear end. I have 3.90 gearing currently. My main question is, if i want to switch to 3.42 (new crate 427 engine), am i replacing the pinion ring and, the differential? The diff i have should take anything between 3.08 and 4 at least right? So just swap out the gear right? Also, never had this rear end apart but its a 12 bolt. Should i assume 30 spline?

I'm diggin this site, thanks!!!

Last edited by 67Chvl67; 05-28-2015 at 05:24 PM.
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Old 05-28-2015, 07:30 PM
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chevymaher chevymaher is offline
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Ring and pinion and bearings and seals. The yellow pattern marker. Is what you need for this swap. A set of shims for it to. They come all in a install set.There are 2 sized carriers just make sure the gear your getting fits the bigger series.
The spline your talking about is the yoke right? There is a axle spline count also. It isn't important on this swap. Take the yoke off and count them to be sure. Make sure it wasn't changed somewhere along the line.
I did a few already. I got a thread on my van site from rebuilding the vans if you want to read it to see what your getting into. I never took many pictures doing the chev's I wasn't a member here yet and it didn't seem important at the time.
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Old 05-29-2015, 05:54 PM
67Chvl67 67Chvl67 is offline
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Ok cool. I'm replacing the bearing not tho yoke so splines are totally not an issue right? I just need to get the gear that'll fits on the diff I have. And the set of bearings etc... Ok I think I got it.
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Old 05-29-2015, 08:47 PM
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chevymaher chevymaher is offline
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And the correct spline on the pinion for the yoke you have.
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Old 05-30-2015, 08:08 AM
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Check the dimensions on the yoke where the universal bearing goes in, I did everything you are doing and still had a vibration and fiqured out that the yoke itself was worn where the bearing goes.
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Old 06-01-2015, 12:37 PM
67Chvl67 67Chvl67 is offline
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Thanks for the tip Ric.

Dropped the 67 off at the garage (in the rain) this morning. This guy does a ton of work so they must be doing something right. Spent the weekend watching countless video's on youtube about DIYing this issue. Decided to go with someone who has all the tools. I HATE leaving it to anyone else to do the work...
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Old 06-03-2015, 03:13 PM
67Chvl67 67Chvl67 is offline
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Got lucky. Just a bad pinion bearing and a possibly worn yoke. Back on the road in a few days! I'm gonna save the gear swap for the off-season.
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