3.90 gears

[LETZRIDE]

Ok where can I buy a good set of 3.90 gears, and has anyone who has them had any issues etc with em?

[kristen]

Re: 3.90 gears

3.73 next is 4.10

[87SC/SS]

Re: 3.90 gears

How much do you like your gas mileage on the highway? The highest I'd run for the street is 3.73. I have an 87 Camaro with a 700R4 and 3.70 gears (9 bolt, not 10 bolt) and at highway speeds it runs at about 3000 rpm. Thats not high for a Honda or a Toyota, but it's up there for a cruise speed on a small block that drinks gas like a..... well no funny analogy comes to mind, but on the highway I get something to the tune of 14mpg hwy. I get better gas mileage in the city than on the highway. In retrospect I wish I'd gone with 3.45's. For a 10 bolt my 3.70 = 3.73, and 3.45 = 3.42.

[LETZRIDE]

Re: 3.90 gears

3.73 next is 4.10

I hear that they make a 3.90 for us now...I dont do too much highway driving, but looking at the calculator 4.10 looks like its going to be too steep

[SilverRS96]

Re: 3.90 gears

nonsence...i run 4.10s on the highway....i get around 260 to a tank with em when i do highway drivin...thats with a cam too...not bad

[LETZRIDE]

Re: 3.90 gears

nonsence...i run 4.10s on the highway....i get around 260 to a tank with em when i do highway drivin...thats with a cam too...not bad

A4? what are you reving at doin aroun 75?

[HossV6]

Re: 3.90 gears

i believe the 3.90s require a special carrier. just go with 4.10s they arnt that bad on the highway

[LETZRIDE]

Re: 3.90 gears

i believe the 3.90s require a special carrier. just go with 4.10s they arnt that bad on the highway

do you have 4.10's? what are you reving at on the highway in an A4?

[Smoke Panther]

Re: 3.90 gears

3.73 next is 4.10

Motive makes 3.90s for f-bodies, but for 3rd gens

http://thunderracing.com/catalog/?ac...&vid=6&pcid=67

[ssms5411]

Re: 3.90 gears

Ebay has 3.90 GM Motives for a good price also. That is where I picked up my 3.73's.

[SilverRS96]

Re: 3.90 gears

A4? what are you reving at doin aroun 75?

M6 im at 2,500

[LETZRIDE]

Re: 3.90 gears

ok, do you think I need the performance TA covers when going with either the 3.73, 3.90, or 4.10 gears? and what does the spline numbers mean...I see some lsd or gears are 27 and some are 28...does this make a difference?

[Smoke Panther]

Re: 3.90 gears

ok, do you think I need the performance TA covers when going with either the 3.73, 3.90, or 4.10 gears?

no

I see some lsd or gears are 27 and some are 28...does this make a difference?

yes it does. You need a 28 spline.

[LETZRIDE]

Re: 3.90 gears

when would you need that cover...or when should you get it?

[IDoVoodoo]

Re: 3.90 gears

Motive makes 3.90s for f-bodies, but for 3rd gens

http://thunderracing.com/catalog/?ac...&vid=6&pcid=67

And 4th gens too!