Author Topic: Trans Shifting Issue  (Read 1158 times)

z28z11

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Re: Trans Shifting Issue
« Reply #30 on: June 02, 2018, 04:44:49 PM »
While we are discussing trans and diff lubricants, anyone old enough to remember why you had to add a bottle of limited slip lubricant to the rear (after the late 60's ?). Hint - Something was taken out of the gear oils used with positractions.

Good Double Bonus question -

Regards,
Steve

1968 Z28 M21/U17 BRG/W
1969 Z28 X77/M20/VE3 LeMans/W
1969 L78 X66/N66 Cortez/BVT
1969 Z11 L48/M35/C60/C06

olddragracer

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Re: Trans Shifting Issue
« Reply #31 on: June 02, 2018, 05:38:11 PM »
The additive was used to modify the slip factor of GL4 lubricant, increase its slip factor, and stop the limited slip clutch plates from chattering going around corners. Whale oil was used in the additive. The use of whale oil stopped with the whaling ban.  The new stuff has never worked as good.   my opinion

olddragracer

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Re: Trans Shifting Issue
« Reply #32 on: June 02, 2018, 05:40:40 PM »
additive has been used since the 1950's

z28z11

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Re: Trans Shifting Issue
« Reply #33 on: June 02, 2018, 10:27:32 PM »
You are correct - my first posi (69 Z) was my intro to the additive. Amazing to believe whale oil was ever used at all -

Wikipedia states the ban went into effect in 1972, prior to that 30 million pounds a year were used for transmission fluids and gear oils.

Regards,
Steve
1968 Z28 M21/U17 BRG/W
1969 Z28 X77/M20/VE3 LeMans/W
1969 L78 X66/N66 Cortez/BVT
1969 Z11 L48/M35/C60/C06

69Z28-RS

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Re: Trans Shifting Issue
« Reply #34 on: June 03, 2018, 03:57:01 AM »
I bought a few bottles  (which I still have) from my local Chevy parts store before they all disappeared...  :)

Gary W / 09C 69Z28-RS, 72 B 720 cowl console rosewood tint
69 Corvette convertible, silver/black 350 hp,
60 Corvette white/red, 72 Corvette coupe, '70 Mach I 
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55-'56-'57 Nomads, '55-'57 B/A Sedan

ZLP955

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Re: Trans Shifting Issue
« Reply #35 on: June 03, 2018, 05:48:32 AM »
Whale oil..... might explain why used rear end oil used to stink so much.
Tim in Australia.
1969 04A Van Nuys Z/28. Cortez Silver, Dark Blue interior, VE3 bumper, Z21, Z23, D55/U17, D80, flat hood.
Sold at Clippinger Chevrolet in Covina, CA. Ex-E/MP at Lions Dragstrip in Long Beach.