Manual Transmission and Rear Differential fluid changing

From the tranny down to wheel bearings.
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Manual Transmission and Rear Differential fluid changing

Postby M20_fever » Thu Mar 19, 2009 4:58 am

So as some of you may know I was afraid that I needed a new G260 because under hard acceleration I could not engage 2nd gear. While I was searching for a new trans. someone mentioned that they had a similar problem, and switching to Redline MTL solved the problem. It was hard to believe that something so simple could solve what seemed to be a major malfunction, but it was worth the $25 to give it a shot. Since I was doing the transmission, it seemed logical to do the diff as well.

I was very lucky to have access to a full shop to do this work, but with the right equipment it can easily be done on jackstands in your garage or driveway.

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We tackled the differential before the transmission. First remove the upper plug on the back of the differential, then remove the bottom plug. Be sure you have a drain pan under the differential before you remove the bottom plug.

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once the differential is done draining replace the bottom plug. To refill the diff you will need either a long tube to attach to a funnel, or a fluid pump of some sort. We used an older hand held fluid pump.

The differential takes ~2 bottles of the Redline gear oil, be sure to use the right type as there are different kinds for open and limited slip differentials. We used the Redline LSD oil.

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To check the fluid level stick your finger in the top plug hole, the fluid should be just below it.

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Replace the top plug and your done, wipe the case off so you can see any leaks if there are any.

Next was the transmission, which is done in the same fashion as the diferential; remove the top fill plug, then remove bottom drain plug (with drain pan in place). The trans. took 2 full bottles of the Redline MTL, so don't spill any or you'll need a third bottle.

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as before check the level with your finger, if it's just below the top plug your good.

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good to go. Hard to believe, but this compleatly fixed my problem, that Redline MTL is some kind of magic oil I swear. This is a very simple form of regular maintenance and a great place to cut your teeth on working on your e30.
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Re: Manual Transmission and Rear Differential fluid changing

Postby BMWIS » Thu Mar 19, 2009 5:40 am

I've seen dyno sheets showing HP gains with a complete swap to Redline fluids.

Did you add any LSD additive? Can't remember if you need with with Redline or not....I'm so on the fence waiting on word about an interview I had last saturday.
If things go like I am praying I'll be putting an alumnium flywheel sachs clutch, and swapping to Redline fluids......Man I'm praying things go my way this time.
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Re: Manual Transmission and Rear Differential fluid changing

Postby M20_fever » Thu Mar 19, 2009 6:00 am

No I didn't use any LSD additive, it says it is usually not needed, but can be used if LSD chatter appears. I can say with certainty that no chatter happens, even when depositing copious amounts of rubber on the pavement. :)
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Re: Manual Transmission and Rear Differential fluid changing

Postby ten2doyle102 » Thu Mar 19, 2009 12:50 pm

I run that same oil in my car. Great stuff that is!! :)

Nice little write up too! Thanks!
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Re: Manual Transmission and Rear Differential fluid changing

Postby Yoshi » Thu Mar 19, 2009 1:50 pm

BMWIS wrote:I've seen dyno sheets showing HP gains with a complete swap to Redline fluids.


Really? I had no clue you could actually gain hp. I figured the ATF you were supposed to use stock was thin and the thinness is what gave you the gains. Redline MTL LOOKED thicker to me.

BMWIS wrote:Did you add any LSD additive? Can't remember if you need with with Redline or not....I'm so on the fence waiting on word about an interview I had last saturday.
If things go like I am praying I'll be putting an alumnium flywheel sachs clutch, and swapping to Redline fluids......Man I'm praying things go my way this time.


They say redline 75w90ns helps lockup. I use regular redline 75w90 tho.

Tony! I love this! Sticky it!

Altho, the diff takes 1.6 liters of 75w90(ns) and the tranny takes 1.4 IIRC. If you didn't have to use more than 1 bottle, you didn't drain it all the way. I generally do mine out of the car and I def use almost 2 bottles on the diff alone.

I LOOOOVE redline fluids.
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Re: Manual Transmission and Rear Differential fluid changing

Postby M20_fever » Thu Mar 19, 2009 4:41 pm

Stickied.

Your right Yoshi, I used almost 2 bottles on the diff. and 2 full bottles on the trans, I'll update the first post.

Oh, and I have no problem with LSD lockup. :twisted:
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Re: Manual Transmission and Rear Differential fluid changing

Postby BMWIS » Thu Mar 19, 2009 4:50 pm

Yep.....Recently I've been into outboard boats....I'd like to hotrod my boat's engine. Same story here. Consistenly gained MPH with a gear case synthetic swap.
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Re: Manual Transmission and Rear Differential fluid changing

Postby M20_fever » Thu Mar 19, 2009 5:00 pm

you run Redline in your outboard? Hmm, my Johnson 150 may like this idea.
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Re: Manual Transmission and Rear Differential fluid changing

Postby BMWIS » Thu Mar 19, 2009 5:59 pm

No it wasn't redline. I'll look it up and post back later.
I've got an Evinrude XP 150. I want to tweek the lower unit/gearcase on, add a few bolt on's then slap a ported 235 power head on later using the bolt on's, and case w/mods.

And I can't stop thinking about how someone in the E30 group might be able to setup a megasquirt to run a custom built FI setup.
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Re: Manual Transmission and Rear Differential fluid changing

Postby M20_fever » Thu Mar 19, 2009 6:17 pm

meh, mine runs 50mph now, thats plenty. I want it to last.
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Re: Manual Transmission and Rear Differential fluid changing

Postby Court M3 » Fri Mar 20, 2009 1:10 pm

no additives needed with Redline fluids. Run it in all of my vehicles so I never have to run into the problem of slipping trans or shifting problems.
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Re: Manual Transmission and Rear Differential fluid changing

Postby M20_fever » Fri Mar 20, 2009 3:36 pm

^^^Court is the one who told me to try this stuff instead of swapping in a new transmission, I owe you one (several actually) buddy! :wink:
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Re: Manual Transmission and Rear Differential fluid changing

Postby 3LOW M3 » Sat Mar 28, 2009 7:49 pm

nice "how to"

looks like a pretty spaced out shop too. how many lifts?
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Re: Manual Transmission and Rear Differential fluid changing

Postby M20_fever » Sun Mar 29, 2009 4:58 pm

4 or 5 lifts, oul chaning stations, washing stations, full tire mounting and balancing services all for $3 per hour, can't beat it.
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Re: Manual Transmission and Rear Differential fluid changing

Postby ten2doyle102 » Sun Mar 29, 2009 5:23 pm

So you just bring you car down there are you can do it yourself??? that's pretty cool!
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