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After only 3000 miles the coolant and transmission fluid is OK to leave there for 50.000 more miles. But if you remove it...it is unsafe to put back in?

I will be draining to install new engine and new transmission. now i'm going to play the devils' advocate here.Changing these fluids after only 3000 miles is accepted as cheap insurance...so do you guys change your coolant and auto transmission fluid every 3000 miles?

yah..i hear you but just wonder?

OK your answer is no..tx.

Not saying i would or wouldn't but nobody changes their transmission fluid and anti freeze for 50,000 - 100,000 miles?

New engine and transmission... Does it make sense to replace clean fluids?

not what do you use...would you re-use the old fluids?

Would you re use your auto transmission fluid if it was only in the car for 3 years, is clean and only has about 2 or 3 thousand miles on it? ...and how about the anti freeze also?

You would have to look at the whole build but everything mechanical has a sweet spot where you get the most for the least.Like Rumble explained your camshafts' operating range plays a big part.If it operates from 2500 - 6000 rpm it would struggle cruising at 2200 rpm.

this is not as simple as it seems. A friend with a 408 and 3.91 gears installed a Mopar auto overdrive in his pick up and his mileage went down.Your most efficient low speed torque must be your cruise rpm and that is determined largely by your cam.If you just want to lower the rpm on the...

just making a point that if it's an "either or" proposition,an oe tapered roller bearing is superior and will never fail if maintained.

oh boy...i have changed 3 on my own newer vehicles. Go to any dealer and check his scrap bin and you will find many replaced weekly.

if they are already installed i might use them but really they are throw away money makers for the auto companies and do fail. Check any dealer scrap bin and you will find a quite a few sometimes.If i needed them i would install o.e. tapered rollers though.

i would stick with original tapered roller bearings or install them if you have the green ball bearings. I don't know why anybody would install green bearings?

rather than cast color paint you might try RPM.I have used it and it does a nice job.

..how do the early '65 4 speed transmissions and components differ from 68 and later units? ..Can a 65 trans be used in a '68 dart conversion?

904 is about 35lbs. lighter too!

tx 340doc

...is changing from 3 speed floor shift manual to 4 speed as easy as changing transmission,shifter and linkage?

How strong are these trans? Stock 340 ...275 h.p. 340 ft. lbs?

my 1969 shop manual recommends dextron ATF for both 3 and 4 speed manual transmissions

Brewers?

Would anybody have a picture of how this shifter installs in the trans tunnel? maybe a pic without the consol just showing shifter and tunnel.

Brewers' list specific pedals for early A,...'68,"69,..."70-72,...'73 and later? How do they differ and what is interchangeable? Is there a preferred year to use in a conversion? tx guys

asking about the 4 speed od, not the 5 speed........ anybody?

Anybody using Passons' 4 spd o/d ratio 2.66:1 1.59:1 1.10:1 .80:1 .......are the new ratios a good fit?

Tx Zak...so just the bell housing? Shifter and rods?

How do a standard 4 speed and OD 4 speed differ?(sm blk) Can you just replace a 4 speed OD with a standard 4 speed or are there differences? .. i.e. bell housing,clutch,shifter etc?