asand1

iTrader: (1)

Pretty crappy explanation, but he is correct. Manuals get better overall mileage, mostly due to the torque converter. Torque converters slip, giving up rpm for torque. A lot of energy is lost in the translation, mostly in the form of heat hence tranny coolers. The reason newer ATs are more fuel efficient at highway speed is because torque converters have hydraulically activated lock up mechanisms in them for better fuel economy.
When my dad switched his Nova from AT to 4MT,. he picked up 15 MPH and about 3 10ths in the 1/4. This is due to a more solid link between motor and Tires. Imagine driving/racing with a slipping clutch, your gonna get worse mileage.

Veeone

Ok thanks for the link will read thru that as well.
Another thing if you do change the final drive gear to you have to change the gear that it meshed with on the other shaft??
Seeing as i would be going form 4.13 to 3.65 thats a bigger difference than 3.8 to 3.65 so the size may be too much to fit in would it??
As i yet to look inside the tranny i'm not sure which it meshes with by looking at the gears in the diagrams. Cheers Vee

Veeone

So would there be anyone that has a 3.823 standard final drive laying around that could give me some measurements off it like overall outside diameter and also the inside diameter and width of the gear across the teeth so i can compare to an auto 3.65 final gear to see if it would bolt onto the manual final drive itself. I do know there is 65 teeth on the standard one and 17 on the pinion but thats about it.
The imported VQ20DE manual has 76 teeth final gear and 17 on the pinion so they are interchangeable.
I may just buy the 3.823 and not bother investigating the 3.65 if i cannot get any info on it.
Any help would be appreciated. cheers Vee

justin8888

I was reading and thought I would just say something if you want good gas milage get a little tiny 4 cyl car and love it with all your heart lol instead hammer down and love it

Nealoc187

iTrader: (23)

I can get you that info but it might not be until the end of next week or the beginning of the following week at the latest.

Veeone

Ok thanks.
The Final drive for the auto 3.65 is not an option as the teeth are 74.
The 20 teeth pinnion that drives it is what gives you lower drive Vee

Nealoc187

iTrader: (23)

Veeone -

3.82 5spd open diff final drive gear dimensions are:

Outside Dia - 203.5mm
Inside Dia - 123mm
Gear Width - 27.25mm

All measurements are to within about 0.25mm.