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11-17-2016, 04:18 AM
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Moderator
 
Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,977
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Re: Ttransmission Lubricant
Which 4 speed?
The SM465 any 80W-90 API GL-5 or MT-1 gear oil. DO NOT use Hypoid gear oil. The additional Sulfur in the Hypoid add pack will eat bronze bushings and synchros. The cautions about not using GL-5 are old and outdated. GL-5 has been reformulated to allow compatibility with bronze synchros. The MY6 & MM7 NP440/A833 originally used Dexron III ATF. GM 88861800 is the equivalent for manual transmissions and transfer cases that originally called for Dexron III ATF. It's not GM Synchromesh fluid and it's not Dexron II or Dexron III either.
__________________
1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. Last edited by hatzie; 11-17-2016 at 04:23 AM. |
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