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#1
04-29-2022, 07:39 AM
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Best Gear Lube for 1970 Formula 400 Firebird 4 speed and 12 bolt differential
Hey...I recently purchased a 1970 Formula 400 Firebird (numbers matching) and am new to PY Online. I'm planning to change the gear lube in the 4 speed trans and rear end and wanted to see if there's a recommended fluid to use? Thanks for any assistance.
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#2
04-29-2022, 08:25 AM
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https://forums.maxperformanceinc.com...89#post6154289
Murf ETA, NAPA carriers Sta Lube products around hear. Amazon also. Last edited by Murf; 04-29-2022 at 08:53 AM. |
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#3
04-29-2022, 10:27 AM
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Whatever gear oil you use, don't forget the GM brand posi additive or you'll get binding.
Also, pictures and details of your car are mandatory. 
__________________
70 TA, 467 cid IAII, Edelbrock D-port heads, 9.94:1, Butler HR 236/242 @ .050, 520/540 lift, 112 LSA, Ray Klemm calibrated Q-jet, TKX (2.87 1st/.81 OD), 3.31 rear https://youtube.com/shorts/gG15nb4FWeo?feature=share |
| The Following User Says Thank You to jhein For This Useful Post: | ||
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#4
04-29-2022, 11:17 AM
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I contacted Valvoline a couple of years ago specifically asking what to use in Muncie transmissions from the 1960's, Here is what they recommend: https://www.valvoline.com/en/synchromesh-mtf/
And for the rear end, any quality GL-5 and I completely agree with the genuine GM limited slip additive if you have a Safe-T-Track differential. Notice I did not say Posi, it is a Pontiac after all, not a Chevy. |
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#5
04-29-2022, 11:26 AM
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No synthetic for Posi's, Safe T Track or any other clutch type diffs.
__________________
1978 Black & Gold T/A [complete 70 Ram Air III (carb to pan) PQ and 12 bolt], fully loaded, deluxe, WS6, T-Top car - 1972 Formula 455HO Ram Air numbers matching Julep Green - 1971 T/A 455, 320 CFM Eheads, RP cam, Doug's headers, Fuel injection, TKX 5 Spd. 12 Bolt 3.73, 4 wheel disc. All A/C cars |
| The Following User Says Thank You to FrankieT/A For This Useful Post: | ||
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#6
04-29-2022, 01:02 PM
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On the transmission, synthetic is fine, but I like to add " MOTOR KOTE" This additive is amazing, and quiets many gearboxes.
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"The Future Belongs to those who are STILL Willing to get their Hands Dirty" .. my Grandfather |
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#7
04-29-2022, 06:50 PM
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After blowing up many a 12 bolt I finally switched to moroso climbing gear lube never broke one again. And I drag raced on these rears for years .
Back when I switched all the stock eliminator guys ran that lube.
__________________
Happiness is just a turbocharger away! 960 HP @ 11 psi, 9.70 at 146. Iron heads, iron stock 2 bolt block , stock crank, 9 years haven't even changed a spark plug! selling turbos and turbo related parts since 2005! |
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