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I recently took some advice and put Red Line MT90 gear oil in my transmission, big mistake. Now it no longer shifts smooth and down shifting from 3rd to 2nd unless I do it gently it will grind a little and power shifting 1st to 2nd also will grind. Prior to changing the oil the transmission...

Hi all, I know there are allot of smart guys on here and hope someone can give me some info. I believe there are 2 different 8 3/4 differentials, large and small stem pinion. I would like to know how to tell the difference. I have 72 Duster with #'s matching 340 & 4 sp. gear ratio is 3:23. Not...

Some of you might remember I asked about a problem I am having with a noise coming from my 8 3/4 diff. I had to put a new yoke on as the old one had some wear and I was told it was unsafe. Since that was done it developed a noise because the yoke nut was disturbed and may not have been put back...

I recently had my 340 Duster 4 sp tuned. The guy needed to put it on a dyno but said the rear yoke on an 8 3/4 diff needed to be changed because it was showing some some wear and it was unsafe to dyno it. I had it changed but now I have a vibration at about 60 mph. I checked the universal joints...