Different Types of Synchromesh Fluid?

[nastynas]

I decided it was time for a tranny fluid change, and I saw that almost everyone on DSM Tuners reccommended Pennzoil Synchromesh. I drove all aroudn town trying to find it, but I ended up buying AC Delco Synchromesh from the GM dealer here. Is this the same stuff, or is it compeletely different than the Pennzoil??

 

[FASTSPOOLINGST]

Get the GM Synchromesh, it's very good. It's recommended on supra, nsx, and a lot of other forums including this one.

 

[aleccolin]

Okay, the Pennzoil/AC Delco/GM Synchromesh is good stuff for the FWD and AWD transaxle, but should I use the same stuff in the transfer case and rear end too, or would it be better to use a synthetic or something else for the t-case and rear end??

Additionally, do I need any sort of additive for the lsd rear end (I'm thinking no since it's a viscous, but thought I'd ask anyway).

The plan right now is Pennzoil Synchromesh for the Transaxle and Mobil 1 gear lube for the t-case and rear end, unless someone convinces me otherwise.

 

[nastynas]

On the bottle of AC Delco synchromesh, it says something like "specifically designed for GM vehicles". I got it from the GM dealership, and they said they don't carry any other kind. Is this what you're talking about by GM synchromesh??

 

[aleccolin]

Yeah, that's the stuff. It should say on the bottle that it meets GM specification 9985648, but either way you're good to go.

http://www.stealth316.com/misc/synchromeshfluid.pdf

Pennzoil Synchromesh Fluid can be purchased as that brand or as the equivalent products: Quaker State Synchromesh (Quaker State is part of Pennzoil), Texaco Synchromesh, GM Synchromesh, or AC Delco Synchromesh (part number 89021808). GM Synchromesh retails for about $10 per quart bottle at GM dealerships. Pennzoil Synchromesh is sold at many Auto Zone auto parts stores for about $5 per quart and should be available from Pennzoil distributors. Texaco Express Lube stores use Synchromesh but the stores I contacted would not sell the product by itself to customers. Pennzoil Synchromesh can be purchased in 5-gallon containers from oil-store.com.

 

[nastynas]

Thanks for clearing that up for me Aleccolin!

 

[tigerstalon]

The plan right now is Pennzoil Synchromesh for the Transaxle and Mobil 1 gear lube for the t-case and rear end, unless someone convinces me otherwise.

Sounds like a good plan to me. The Synchromesh helps shifting in manual transmissions with brass synchros. However, it seems thinner than the standard 75W-90 oil that is recommended for the DSM tranny/differentials. Since there is no need to worry about brass synchros/shifting in the center/rear differentials, I would say go with a decent 75W-90 gear oil.