m46 or 3.54 rearaxis

  • Thread starter Thread starter kwijlebabulus
  • Start date Start date
K

kwijlebabulus

Hello

'Cause I'm driving a lot of highway, I would like to decrease my rounds
par minutes.

I'm driving a B230 engine with a m47 (5speed) and a 3.73 rear axis.

Now I was wondering what I should change to decrease my RPM.

Take an m46 with OD and my old 3.73 rear axis
or
keep my m47 and take the 3.54 rear axis.

(or take the m46 and the 3.54)

Do you folks have an idea or opinion about this?

All advices and stories are welkom

greets kwijlebabulus
 
kwijlebabulus said:
Hello

'Cause I'm driving a lot of highway, I would like to decrease my rounds
par minutes.

I'm driving a B230 engine with a m47 (5speed) and a 3.73 rear axis.

Now I was wondering what I should change to decrease my RPM.

Take an m46 with OD and my old 3.73 rear axis
or
keep my m47 and take the 3.54 rear axis.

(or take the m46 and the 3.54)

Do you folks have an idea or opinion about this?

All advices and stories are welkom

greets kwijlebabulus
Click to expand...

The difference between M47 5th gear and M46 overdrive is so small as to
be not worth thinking about. The 3.54 ratio would make a noticeable
difference. (The last manual transmission 240s over here had 3.31
axles.)

--
Mike F.
Thornhill (near Toronto), Ont.

NOTE: new address!!
Replace tt with t (twice!) and remove parentheses to email me directly.
(But I check the newsgroup more often than this email address.)
 
hello mike


Thanks for the advice. I will probably take the 3.54.

Has it any influence on the acceleration in the lower gears?

greets kwijlebabulus
 
kwijlebabulus said:
hello mike

Thanks for the advice. I will probably take the 3.54.

Has it any influence on the acceleration in the lower gears?

greets kwijlebabulus
Click to expand...

I've never changed a rear axle, but a 5% higher ratio (lower number) has
to reduce torque available to the wheels by 5% at a given road speed.
That said, you gain something back because you hold each lower gear 5%
longer.

--
Mike F.
Thornhill (near Toronto), Ont.

NOTE: new address!!
Replace tt with t (twice!) and remove parentheses to email me directly.
(But I check the newsgroup more often than this email address.)
 
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