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Discussion Starter #1
I have a fresh 0 mile rebuilt tranny and was curious if I it was worth the money to put synthetic gear oil in it.

What would be some of the benefits? Aside from cost, any downsides?
 

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I have used Mobile 1 synthetic is a few different trannys, I feel it is a great improvement in cold weather. Couldnt really tell if it made a difference in the summer. It sure seemed to shift smoothly cold or hot. I dont know of any reasons not to use synthetic, except the cost, or if you plan on changing the fluid frequently.
just my .02.
-Jeremy
 

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Originally posted by Rat Patrol:
<STRONG>I have used Mobile 1 synthetic is a few different trannys, I feel it is a great improvement in cold weather. Couldnt really tell if it made a difference in the summer. It sure seemed to shift smoothly cold or hot. I dont know of any reasons not to use synthetic, except the cost, or if you plan on changing the fluid frequently.
just my .02.
-Jeremy</STRONG>
He hit the nail on the head. If it's for a daily driver - I say go synthetic. But if it's for a trail only beast I would stay with regular fluid. I say that because it's not seeing a lot of milage and if you need some fluid on the trail - chances are a bud will have some that will work. Plus it's not worth the extra $$$ for something that sees 10 miles a week <IMG SRC="smilies/biggrin.gif" border="0"> <IMG SRC="smilies/biggrin.gif" border="0">
 

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I would use it but minesmanages to fill itself it water too often <IMG SRC="smilies/rolleyes.gif" border="0"> It would get pretty damn expensive to change it very often
 

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Discussion Starter #5
Good input. Mostly what I expected(little better shifting, expensive)

For now, the rig is "trail" only while I get all the bugs and such worked out. But I do plan to use it extensively as a daily driver(at least during the summer) once I have everything worked out.

I'm not too worried about water accumulation as I think I have it completely sealed except for the shifter lever which I will be sealing up also once everything is done <IMG SRC="smilies/smile.gif" border="0"> The breather is going to be routed somewhere in the engine bay.
 

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What kind of trans? Some require synthetic, such as the NV 4500.

Pete
 

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Discussion Starter #7
Originally posted by pcorssmit:
<STRONG>What kind of trans? Some require synthetic, such as the NV 4500.

Pete</STRONG>
Its a "special" SM465 <IMG SRC="smilies/biggrin.gif" border="0"> Actually it is a run of the mill SM465 with a custom input shaft.

I've currently got regular gear oil of unknown weight in it(ie, I didn't pay attention to what I grabbed out of my stash) But, I think it was a heavier weight. I am not overly happy with the shifting of it I've had for the couple of test drives I've had with it(maybe 1 mile total)

Granted it is a funky project(custom gear reduction box in front of SM465) but I think with a lighter(maybe even synthetic) gear oil, it should shift a bit better. I think spending $50 at this point to test out synthetic might be a wise move
<IMG SRC="smilies/eyemouth.gif" border="0">

[ 10-29-2001: Message edited by: Lil'John ]
 

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I put reguler gear oil in my NP435, it was really hard to shift, i changed it Redline oil and it shifts a lot better, (i did not rebuild it, i just pulled it out of a pick and pull and ran it)
 

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Originally posted by Lil'John:
<STRONG>Granted it is a funky project(custom gear reduction box in front of SM465) </STRONG>
What did you do? What is the custom gear box? Sounds cool.
 

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Discussion Starter #10
Originally posted by Grandpa_Jeep:
<STRONG>What did you do? What is the custom gear box? Sounds cool.</STRONG>
Basically, I put a new input and output shaft on an NP203 gear reduction box and hooked that in front of the SM465.

In actuality, I used a Dodge NP203 input gear and put a spud shaft on it to work with the clutch. I then took the NP203 intermediate shaft and had it splined to take a slightly modified SM465 input shaft.

Overall length of it is 9 inches. 3 inches of that is adapter.

I don't currently have any pictures handy(but I do have a TON of them on my laptop which is packed away)

Project started after my frustration on not being able to find a SM465 version of the NP203. After getting the gears made, I found one(the NP203 with adapter cost me $250... no comment on the price of the gears <IMG SRC="smilies/eyemouth.gif" border="0"> ).... but continued the project ANYWAY since the gears were the most expensive part. I traded the NP203 I found and actually tracked down another one that I am holding onto for now.

This has been a 2 year project that I am finally wrapping up. With it, I net a double low of approximately 120 to 1 in my Land Cruiser.

Unfortunately, as they say, hindsight is 20/20 <IMG SRC="smilies/frown.gif" border="0"> Since starting this project, I've seen/dreamed of MANY other approaches that would have worked and SEVERAL that would have been cheaper. I still MAY use one of the other ideas floating in my mind but I still like this project <IMG SRC="smilies/smile.gif" border="0">
 

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<FONT COLOR="Red"> I run Redline MT-90 in my Toyota trannys and it's worth every penny. The stuff is manufactured specifically for manual trannys and has friction modifiers to make the synchros work better than anything else I have ever tried. </FONT c>
 

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Discussion Starter #12
Originally posted by Slick:
<STRONG><FONT COLOR="Red"> I run Redline MT-90 in my Toyota trannys and it's worth every penny. The stuff is manufactured specifically for manual trannys and has friction modifiers to make the synchros work better than anything else I have ever tried. </FONT c></STRONG>
Sounds like what I'm looking for <IMG SRC="smilies/smile.gif" border="0">

Do you have a web site address or such for buying it? I'm in a "little" town that probably wouldn't know what it is <IMG SRC="smilies/smile.gif" border="0">
 
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