What do you use for oil / fluid?
I know the book says to use synchromesh... but that stuffs like water.... and I've never had problems using 80w90 GL-5 and have been running it forever.
I'm going to be replacing my trans soon and was just wondering what most of you run in yours and what luck you've had.
GM Sychomesh or Pennzoil Synchromesh...
I tried 80w90, and it wouldn't shift for anything
5W30 motor oil. (not even sure, but I don't even think I have synthetic) That's what specified on a 2nd Gen 2.2 5spd (also uses Isuzu MK7).
Also put over 200 ft/lbs into it.
www.gmscf.com
I am using Royal Purple Syncromax
Jason
99 Z24 Supercharged
157hp/171tq - NA
190hp/170tq @ 6psi
LG0/LD9 for Life
Penzoil Synchromesh. Have to use it in my NVG3500 for my truck as well.
i used royal purple scyncro max and it was cheaper than the gm stuff
my kill list:a geo metro and a mac semi wow did i kill that thing
pennzoil synchromesh. since pennzoil is who makes the product you'd buy at the dealership, and you can get the pennzoil flavor at any parts store, for 1/2 the price, cant go wrong. i'd like to know, however, how the OP can say that synchromesh is "like water" but he obviously knows better than the engineers whom designed the trans what fluid works best in it?
JBO Stickers! Get yours today!
^Lets not pretend like the engineers who designed the isuzu trans were any good at what they do. They had to have rode the short bus if ya know what I mean, so....question everything IMO.
"Never argue with an idiot. They'll drag you down to their level, then beat you with experience!" -Anonymous
Joshua Dearman wrote:^Lets not pretend like the engineers who designed the isuzu trans were any good at what they do. They had to have rode the short bus if ya know what I mean, so....question everything IMO.
The problem is not the people that designed the bulletproof transmission. The problem is the people at GM that made the thing cheaper.
www.gmscf.com
^LOL......
"Never argue with an idiot. They'll drag you down to their level, then beat you with experience!" -Anonymous
When you shake a bottle of Synchromesh it sounds just like there is water in there.
And generally.... the thinner the oil.... the less protection it provides...
Thats what I meant.
I do think it's funny that I never heard of syncromesh until 2005 and my car is a 97 but it's still supposed to use it..... Although I cant seem to find when it came out.
Every car I've seen or owned (until this Sunfire) ran 80w90 or just straight 80 or 90 weight in manual transmissions... It was a general rule..... just like putting it in the differential case... And the Sunfire works fine with it as well
Im just afraid to run "Whats suppose to be in there" because I'm worried about increased wear... so I though I'de ask everyone that does... and see if they've had any problems... wich it seems you all dont.
Sometimes I wonder whats going on though.... There are manual transmissions that call for automatic tranny fluid.
in my experience... i used royal purple sythetic and didnt like it. tranny whined really loudly and didnt shift the best. swapped to
gm syncromesh and it shifted/sounded beautifully.
I'm tired of wasting my time... now I'm breakin' free.
I have been considering switching from syncromesh to an 80-90w. When I start my car up in the morning (especially a cold morning) it shifts quite smoothly. After about ten minutes or so, it starts to crunch into second and third gear. It has been doing this for a long time, and I really need to throw a new trans in there some day. But until then, I would like to try a thicker oil. Obviously oil is thicker when it is cold, so I figure why not put some thick stuff in there...
Weeble, does your trans shift ok with the gear oil in there?
Go Go OG Traction!!
Quote:
There are manual transmissions that call for automatic tranny fluid.
Like the NV2500 that GM says use synchromesh with. Dodge uses ATF. It's the same tranny with a different bellhousing. Many local shops will run those two fluids interchangeably. I have found my Isuzu trans shifts best with 5w30. Gear lube offers more protection, but you are losing power and efficiency to that sludge.
we run 5w30 petroleum motor oil in the race cars
Eric Anderson wrote:Quote:
There are manual transmissions that call for automatic tranny fluid.
Like the NV2500 that GM says use synchromesh with. Dodge uses ATF. It's the same tranny with a different bellhousing. Many local shops will run those two fluids interchangeably. I have found my Isuzu trans shifts best with 5w30. Gear lube offers more protection, but you are losing power and efficiency to that sludge.
Last time I saw anything from Chrysler on the NVG transmission they used it was to use the Chrysler version of synchromesh. I have never heard of a NVG 2500 though. Is it a newer trans or was it out the same time as the 1500/3500/4500? My NVG 3500 uses synchromesh just lime the one from my brother inlaws Dakota used. Even his service manuals call for synchromesh. I dont recall the exact name they used but the part number cross referenced over to GM synchromesh.
OG Nick wrote:I have been considering switching from syncromesh to an 80-90w. When I start my car up in the morning (especially a cold morning) it shifts quite smoothly. After about ten minutes or so, it starts to crunch into second and third gear. It has been doing this for a long time, and I really need to throw a new trans in there some day. But until then, I would like to try a thicker oil. Obviously oil is thicker when it is cold, so I figure why not put some thick stuff in there...
Weeble, does your trans shift ok with the gear oil in there?
It shifted fine until a shift cable went out and messed up my synchros.
Although I had the opposite problem that you do... In really cold weather (below freezing) the car would want to move forward a little when I let the clutch out in neutral and I had to be carefull shifting it... but after a few blocks it would shift fine..... in the summer I never had any problems at all.
IM just afraid of having shifting problems when the tranny get warm like you do... and am thinking of going somewhere inbetween.... I'l prob try the Pennzoil synchromax.... and if I have any probs... I'll setp up to something a little thicker....
But in warm weather.... I never had a problem at all with 80w90 GL5 in there.
This is my diff after using Mobil1 synthetic 80w90, 100,000 miles on it. My old tranny was using GM synchromesh and had 90,000 on it and the diff is prestine. I don't know if I can blame it on the oil, but its sure enough to make me switch back to GM Synchromesh and dish out the extra $20 or so. I've also heard that the heavier weight oil makes shifts harder. I was actually going to stop by the dealer and buy some synchromesh to change the oil in my tranny the day it failed.
Old diff is in the back ground, with no wear on the diff gears, just a messed up ring gear from a bearing exploding and a pin lodging in the teeth and locking my front wheels at about 10mph.
Paying someone to install parts and bragging about it being fast, is like watching someone bang your wife and being proud to raise their kids.
i tried a few different fluids in my 96 z24 tranny. I liked the GM stuff the best.
sold it with 155k miles on it and it was supercharged for 30k miles and raced hard from 80k miles on up. And people didnt like them trannys, haa. It is still going today after i sold it a few years back
just stick with the GM stuff, trust me.
( i have one quart of gm syncromesh(unopened) left that i will probably never use( dont think the getrag tranny uses it, as my 02 ls sport had the tranny fluid changed back in the day to some saturn stuff). Anyways, shoot me a PM if anyone wants it and we can work something out. )
^^^^ thats OK thanks..... I'm getting ready to head over to where I have the car sitting and start working on it.... so I'lll just pick up some stuff today...
thanks though.
i use gear oil in mine and haven't had any problems same stuff used in rear wheel drive differentials or as mechanics call it monkey piss because of the smell lol
^^^^^ ya gear oil can get pretty bad LOL
And the car should be back together next weekend (had to put it off because its not at my place)
I bought the last 2 quarts of Pennzoil Synchromesh they had at Auto Zone.... hopefully everything work out when its all done.
The Zone by me never has more than 2 quarts in stock at one time.
They likely use the lower viscosity oil to allow better cooling to the synchonizers and gears since it's purely splash lube - you need that for the small bearings too.
I would expect it has some synthetic EP (extreme pressure additives) too for the gears. Clearly the lower the viscosity the less HP loss throught the trans too.
I put 189K on my trans with 1 flush around the 100k mark and no problems.
