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Transmission, Rear End... Talk & Q&A! Tranny, rear end, drivetrain related stuff... shift it... grind it... pop da clutch!

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  #1  
Old 01-13-2018, 11:01 PM
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Default LA 318 & 904 trans

HI ...

any thoughts on a more economic option ?

was chatting to a buddy of mine last nite was claiming around $37.75 of gas to do 344 miles ~ ive worked this out to US dollars ~

hes running a 327 / 700r4 in a twin spinner so theres a little weight

we pay $8.01 for a gallon ( yes I know raped then robbed for gas !!)

SO then after all that .. what if any is a good gas mileage trans for a LA series 318 ?

thanks
Crate
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Old 01-14-2018, 12:11 AM
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Maybe add a Gear vendors OD behind the 904?
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Old 01-14-2018, 06:58 AM
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A A518 overdrive from an 89-92 Dodge 2wd dakota, durango or full size van, the later ones are electronic and need a computer to run them.
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Old 01-14-2018, 02:12 PM
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Every engine has its "sweet spot", where a few hundred RPM can be the difference between poor mileage and good.

At cruising speed, you want your motor to be its powerband, unless it's a very light car. For example: If the 318 doesn't make torque until 2200 RPM, don't ask it to spin 1800 and deliver mileage.

Obviously, an automatic OD has its advantages. Most have a lower 1st gear and naturally, an overdriven 4th. You need a properly matched diff ratio and tire size to benefit from any transmission's ratios.

I would find the 318's specs and the ratios for your transmission candidates... plug all your numbers into a calculator.

https://www.ringpinion.com/calculators/Calc_RPM.aspx

.
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Old 01-15-2018, 03:48 AM
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https://www.ringpinion.com/calculators/Calc_RPM.aspx

Thanks Dr C theres abit to think about there.. I guess there any cam work, head flow work , can alter torque to factored into that

for some reason I was working on some generic application, but is not quite as easy ..

dam good start that link !!
Bama had a look at the Gear vendors site .. poss a bit pricey at this stage ~ but its early days in my build. so come to that ..

or even look at the A518 ..

before all that I get my sh#t sorted..

Thanks All
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Old 01-15-2018, 09:59 AM
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I'm all for the A518
I'm gonna put one of these behind the 392 Hemi I'm putting in the 37 GMC
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Old 01-15-2018, 11:19 AM
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Quote:
Originally Posted by Old Iron View Post
I'm all for the A518
I'm gonna put one of these behind the 392 Hemi I'm putting in the 37 GMC
And I'm putting one behind the 440 in my 28 FastFour
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