Jump to content
  • When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.

ATF fluid in 4 speed ???


Guest Anonymous

Recommended Posts

Guest Anonymous

My '84 Volvo box calls for Dexron II, and it's pretty similar overall to the BMW box. I don't know why, but since the early '80s many gearboxes stopped calling for old-fashioned heavy gear oil, and switched to auto trans fluid.

It probably works better at low temperatures than 80w gear oil, which might help your synchros when the car is cold.

Mike

Link to comment
Share on other sites

Guest Anonymous

I am sure about one thing: if the inards of the trany uses clutches lining as syncho stopers, like my borg warner t-5, it will defenitively needs atf, and it will not work at all without it, or very badly, The heavy 80w oil will destroy the linings, i did experience it in my t-5. That is the sole purpose of using this oil then, same material as the automatic trany clutches. As our syncrho are made of brass or so, i dont know what it will do to them with atf, maybe premature wear??

Pat

Link to comment
Share on other sites

Guest Anonymous

I own a Ford Aerostar Cargo van I use for my work. It has a 2.3 SVO style injected/header exhaust motor with Mazda 5 spd., which is why I like it. It's my second 5 spd. Aerostar, and both of them have specified ATF for the trans. However, when I bought this current '87, it had already been changed to 80-90 weight lube, and seems to be fine at 250,000 miles. May disprove the wisdom of sticking with ATF.

Link to comment
Share on other sites

Guest Anonymous

When I rebuilt my 4-speed, I bought new synchros. There are two basic types of synchros on the 4-speed: the old 'Porsche style', and the newer 'Borg-Warner style'. The change occurred around '71, I think. Both types of synchros were made of brass.

So I ordered a set of the Borg-Warner style synchros, and I was told that the 'original' BW-style parts were no longer available, and had been replaced by a slightly different design. The original ones had grooves on the friction cone surfaces, the new ones have a frictional material---very possibly made of the same stuff as a clutch lining--embedded in the friction cones. I was not told by the supplier to run ATF, but it's possible that it should be done. I ran Redline MTL in it for about 2 years/ 25k miles with no problem, but it's rather similar to ATF in consistency, and might be formulated for newer model gearboxes that run lined friction cones.

Mike

Link to comment
Share on other sites

Guest Anonymous

90 weight gear oil is not as heavy an oil as you'd expect. The API weights for gear oil do not use the same scale as SAE motor oil viscosities. ATF and API 90 weight gear oil are about the same viscosity as SAE 30 motor oil. So it's no surprise that they can interchange with no immediate - or even longterm - ill effects. For that matter, ATF and power steering fluid are reputed to be the same thing in some circles. My M5 calls for ATF in the power steering circuit, so they have to be very similar.

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • BMW Neue Klasse - a birth of a Sports Sedan

    BMW Neue Klasse - a birth of a Sports Sedan

    Unveiling of the Neue Klasse Unveiled in 1961, BMW 1500 sedan was a revolutionary concept at the outset of the '60s. No tail fins or chrome fountains. Instead, what you got was understated and elegant, in a modern sense, exciting to drive as nearly any sports car, and yet still comfortable for four.   The elegant little sedan was an instant sensation. In the 1500, BMW not only found the long-term solution to its dire business straits but, more importantly, created an entirely new
    History of the BMW 2002 and the 02 Series

    History of the BMW 2002 and the 02 Series

    In 1966, BMW was practically unknown in the US unless you were a touring motorcycle enthusiast or had seen an Isetta given away on a quiz show.  BMW’s sales in the US that year were just 1253 cars.  Then BMW 1600-2 came to America’s shores, tripling US sales to 4564 the following year, boosted by favorable articles in the Buff Books. Car and Driver called it “the best $2500 sedan anywhere.”  Road & Track’s road test was equally enthusiastic.  Then, BMW took a cue from American manufacturers,
    The BMW 2002 Production Run

    The BMW 2002 Production Run

    BMW 02 series are like the original Volkswagen Beetles in one way (besides both being German classic cars)—throughout their long production, they all essentially look alike—at least to the uninitiated:  small, boxy, rear-wheel drive, two-door sedan.  Aficionados know better.   Not only were there three other body styles—none, unfortunately, exported to the US—but there were some significant visual and mechanical changes over their eleven-year production run.   I’ve extracted t
  • Upcoming Events

  • Supporting Vendors

×
×
  • Create New...