Rear-end/Tranny Oil
#21
(08-02-2015, 06:21 AM)1969_Mach1 Wrote:
(08-01-2015, 08:09 PM)Mustangmike Wrote:
(08-01-2015, 10:39 AM)1969_Mach1 Wrote: During manufacturing GM did not add an additive and after a few thousand miles the clutches would chatter. Changing gear oil and adding the friction modifier was the fix. I knew the service manager at the local Ford dealer during that time and I guess Ford had the same issues.

Regards,
Mike

It is interesting to know that the manufacturer did not add the additive. Did they forget or was it not known yet that the limited slips rear ends would require the friction modifier?

Mike

I understood they did not know there would be an issue. There was a TSB, technical service bulletin, for the issue. Like I mentioned, it took a few thousand miles before it would start. For a while it seemed there were two or three cars or trucks in the shop each day because of clutch chatter. I don't know if clutch chatter was an issue on late 60's early 70's cars and trucks. I'm not quite old enough to have been working on them back then.

Believe me, there were a lot of issues that popped up after the cars were on the road for a while. There were many binders filled with TSB's. The general public only gets notified of safety related issues.

Regards,
Mike

Thanks for answer...good to know. Then it may be possible I may need to add something down the road...I will keep this thread in mind.
Reply
#22
(08-01-2015, 07:53 AM)Mach1FatherFigure Wrote: No rear axle or transmission manufacturer recommend anything other than a good quality oil of the grade in the handbook.

Actually, Ford, GM and Chrysler have been requiring the use of 4oz of "LS" additive in thier limited-slip differentials when performing a fluid replacement from at least as far back as the 70's.
It is necessary...not just an ambiguous "snake oil" product.
Reply


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