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BJ & FJ Ratio

Tech Talk for Cruiser owners.

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BJ & FJ Ratio

Post by SOFT 40 »

Hi all, I just wanted to know if the diff ratios are the same and what about the transfer case. I have only just picked up a BJ40 and my Speedo is out. It has 31/10.5/15 tyres on it + what type of speed should I get out of it. The old girl is flat out doing 100kmh on my GPS. Any info would be good.

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Post by DIRTY ROCK STAR »

what yr is it champ? and 4 speed?
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Post by SOFT 40 »

Don't know what year, might be a '79, full fiberglass body, 4 speed, i think that it is a bitsa.
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Post by shorty_f0rty »

pretty sure i've got 4.11's in my 1984 bj42..

doing a speedo test with my 33's on i register .9kms per 1km.. so i figure with 32's they should be about right.. and on 31's they'd be a bit more.. not 100% sure though..
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Post by SOFT 40 »

Is there any engraving or tags on the diff that tells you the ratio? Or do you have to pull out the center and look at the gearing? I am new to cars, I just ride bikes.
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mmm

Post by turbo42 »

No marks from factory that I have ever seen, usually just count teeth of spin the drive flange and measure the wheel turn.
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Post by bj on roids »

4.11 is bound to be your diff ratio, t-case is easy with a search,

the only other factory diff options are 3.7 and 4.10 neither of which you will have in that year model
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Post by SOFT 40 »

Thanks for the info guys. What speed is normal for a BJ40?, I was thinking around 120 to 130 kmh tops.

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Post by DIRTY ROCK STAR »

SOFT 40 wrote:Thanks for the info guys. What speed is normal for a BJ40?, I was thinking around 120 to 130 kmh tops.

Shorne
you are too used to bikes i think dude.
as a stocker i reckon 100-110 would be all.
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Post by WICKED »

DIRTY ROCK STAR wrote:
SOFT 40 wrote:Thanks for the info guys. What speed is normal for a BJ40?, I was thinking around 120 to 130 kmh tops.

Shorne
you are too used to bikes i think dude.
as a stocker i reckon 100-110 would be all.
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Post by DIRTY ROCK STAR »

get a 2F up ya then!
atleast you can drive at normal speeds.

what top speed do you get from a B motor then??
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Post by bad_religion_au »

i've seen a stock HJ45 wind off the speedo.

top speed i've seen in the fj40 was 140 on 33's.

wouldn't want to try it now...
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Post by davidwalton »

done 160kmph in my fj40 with 4.11 and 35" soa.
Only thing it has a 350 chev. shit my self dooing it.
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Post by Reddo »

brrrrrrrrrrmmmmmmmmmmm

thats with 35's, SOA, and a 2H....... and after backin off.

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top speed

Post by Gibonator »

AND NO TAIL SHAFT = goin no where
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Post by cloughy »

Old boys old shorty I used to use years ago would see $1.50 with 31's, farking hard to keep on the road but ;) must be somewhere around the governor, cause it wouldn't pull any more, 32's killed it and all it would see is 135 :cry:

Give my RR a squirt the other night, $1.70 for a quick one, but the poor centipedes get a little uncontrollable :?
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Post by fullmetaljacket »

flat road, no wind, 33's, my "B" can do 130k's by GPS reading (who want to go over 100-110 any ways), my mates 2f 45ser can do 170 easy.....
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