Transmission Fluid Poll

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What kind of transmission fluid do you suggest?

Poll ended at Mon Jan 12, 2009 3:05 pm

Royal Purple 75w90
5
26%
Redline 75w90NS
4
21%
Straight Synchromesh
3
16%
Other
7
37%
 
Total votes : 19

Transmission Fluid Poll

Postby kulangflow » Mon Jan 05, 2009 3:05 pm

I recently purchased my first AllTrac, and I am currently in the process of redoing all the fluids. I have done a great deal of research on manual transmission fluids for this car, as there is a great deal of information on it here, and I have boiled it down to a few options.

It should be known that my car has really bad synchros, so I will be replacing the transmission in the next year or two.

So, what do guys suggest?

-Royal Purple MaxGear 75w90. (In stock at Autozone for $17/qt)
-Redline 75w90NS. (Can only find online for $10/qt + shipping)
-Straight Synchromesh (In stock at Autozone for $7/qt)
-Other

BTW, it's a 1988 IMSA GTO edition with 142,000 miles. Also, I live in Utah so it can get down to below freezing temperatures.

Thank you!

-Brian
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Postby Dracov » Mon Jan 05, 2009 11:19 pm

Switching to Redline made my synchro issues a little bit worse than with whatever the old fluid was. Still on the 165's original gearbox
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Postby kulangflow » Mon Jan 05, 2009 11:23 pm

Dracov wrote:Switching to Redline made my synchro issues a little bit worse than with whatever the old fluid was. Still on the 165's original gearbox


Were you using 75w90NS or just 75w90? What I gather is that the NS version is needed for the synchros in our trannies.
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Postby grip addict » Mon Jan 05, 2009 11:39 pm

used valvoline durablend 75-90 for a while, and the car shifted really well. i know a couple of other people on board are using it too.

mmm... the smell of gear oil.
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Postby toayoztan » Tue Jan 06, 2009 12:07 am

grip addict wrote:used valvoline durablend 75-90 for a while, and the car shifted really well. i know a couple of other people on board are using it too.

mmm... the smell of gear oil.


That's what I use to, no issues at all.

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Postby kulangflow » Tue Jan 06, 2009 12:38 am

grip addict wrote:used valvoline durablend 75-90 for a while, and the car shifted really well. i know a couple of other people on board are using it too.

mmm... the smell of gear oil.


How would Valvoline Durablend compare to the Valvoline SynPower? My local Checkers has the SynPower in stock for $10/qt, but no Durablend to speak of.

Thanks again for the assistance!

There is a ton of info on MTF fluid, but most of it is from 2-3 years ago. It makes me wonder what people are using now, if changed at all.
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Postby Corey » Tue Jan 06, 2009 12:50 am

I've tried both Redline and Royal purple.

redline went into the old E150F tranny - I don't think i really noticed any difference in shifting when compared to the fluid originally in there. Still had the usual 2nd gear hi-rpm grind.


Royal purple went into my newer E154F tranny with the better syncros - so i can't really compare the two.

I'm happy with either one, they are both good oils.
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Postby RafaCalde » Tue Jan 06, 2009 1:47 am

i was thinking of using royal purple, 2 qts of maxgear and 3 qts of synchromax. anyone think this would be bad? should i just use 5 of synchromax or 5 of maxgear?
Rafa

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Postby Dracov » Tue Jan 06, 2009 2:12 am

kulangflow wrote:Were you using 75w90NS or just 75w90? What I gather is that the NS version is needed for the synchros in our trannies.


Yeah, it's 75w90NS
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Postby tissimo » Tue Jan 06, 2009 3:02 am

I put in 75w90ns and didn't notice any real difference.
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Postby Simba » Tue Jan 06, 2009 3:41 am

I've used virtually everything. Mine likes Redline MTL the best. Slightly thinner than the usual 75/90's.

I've also found that Redline Heavy Shockproof is simply awesome in the diff.

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Postby tissimo » Tue Jan 06, 2009 4:34 am

Simba wrote:I've used virtually everything. Mine likes Redline MTL the best. Slightly thinner than the usual 75/90's.

I've also found that Redline Heavy Shockproof is simply awesome in the diff.


I ran shockproof in my old mkiii supra trans and loved it. They have a first gear thrust washer issue when you're making big power/torque and wanted to be safe, but it shifted smooth and didn't have any issues.

I'll probably run MTL in my 90 after I do the clutch. It ran good in my supra before.
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Postby RedCelicaTRD » Tue Jan 06, 2009 7:24 am

My st185 has Mopar 80w90 in trans and rear diff. Mt st165 has Valvoline full synthetic in the trans and Mopar 80w90 in the rear diff. St165 grinds because the clutch is not adjusted properly. St185 is hard to shift due to short shifter. Other then that I'm happy.
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Postby wizzards581 » Wed Jan 07, 2009 4:28 am

i used pennzoil GM synchromesh for 3yrs ~15k miles... nothing wrong... i might change it in summer... :smokes:

i notice nowdays Honda owners are starting to use these stuff because it hides the grinds... :wink: at least for me...
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Postby Rick89GTS » Wed Jan 07, 2009 5:07 am

I went with Castrol Hypoy C 80w90 in the tranny and rear diff.
Last edited by Rick89GTS on Sat Oct 31, 2009 6:43 am, edited 2 times in total.
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