mk3 transmission question/ tire question..

cre · 04-03-2010, 07:49 PM

Wider tires = more rolling resistance. Don't go wider than you actually need and absolutely do not go wider than your rims will support without distorting the sidewalls! I don't recommend any wider than 235 on a 7" rim.

As for the transmission fluid Dexron VI (that's Dex 6 NOT 4) is supposedly cross compatible and has better hydostatic properties and generally runs cooler. I would verify this first though and flush thoroughly before converting. You'll need to further research this though, I haven't dealt with this myself.

A REAL synthetic of either type of fluid will provide more consistent viscosities at various temperatures, definitely a good thing if the car is driven hard.

With a transmission fluid change on a high mileage car I recommend installing an inline filter at the return from the cooler. The fresh detergents are going to free up a lot of crap that's accumulated over the years. Change the filter after a couple months and then once every 10Kmi to 20Kmi thereafter.

04-03-2010, 07:49 PM	#3
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Wider tires = more rolling resistance. Don't go wider than you actually need and absolutely do not go wider than your rims will support without distorting the sidewalls! I don't recommend any wider than 235 on a 7" rim. As for the transmission fluid Dexron VI (that's Dex 6 NOT 4) is supposedly cross compatible and has better hydostatic properties and generally runs cooler. I would verify this first though and flush thoroughly before converting. You'll need to further research this though, I haven't dealt with this myself. A REAL synthetic of either type of fluid will provide more consistent viscosities at various temperatures, definitely a good thing if the car is driven hard. With a transmission fluid change on a high mileage car I recommend installing an inline filter at the return from the cooler. The fresh detergents are going to free up a lot of crap that's accumulated over the years. Change the filter after a couple months and then once every 10Kmi to 20Kmi thereafter. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

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