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diff ratio, BJ42

Tech Talk for Cruiser owners.

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Posts: 26
Joined: Tue Nov 29, 2005 2:08 pm
Location: bathurst, NSW

diff ratio, BJ42

Post by red rattler »

hi all, i am looking at putting new crown wheel an pinion in my bj42, 1982 and was just wondering what the factory diff ratio is? Someone told me 3.7, is that correct? I am currently running 33's and was also wanting to know if i should get a lower ratio , the car is mainly used for 4 wheel driving, and if so what new ratio should i get. Any info on what you have done would be great. thanks.
bj42 - built to last , not go fast
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Post by bad_religion_au »

it'll be 4.11:1 and i wouldn't bother changing ratio's for 33;s
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Post by bj42turbo »

I agree with Bad relig, I run standard 4.11:1 with 34' tyres with no problems, although turbo does help


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Post by bad_religion_au »

i'm goin to attempt q78's (35.5's) on 4.11's :D
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Post by red rattler »

thanks for that BJ and bad_relig, much appreciated. the reason i asked was because my rear diff appears to be making a bad "wine" noise whan driving and i was thinking of replacing the crown wheel and pinion, but i think i will first try some thicker oil and see if that fixes it. hopefully!!
Cheers , Chris
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Post by Reddo »

check that the pinion is not loose - just grab it an give it a shake. If it is, you may be able to cure the whine by tightening the pinion nut (in middle of the drive flange), they often work loose. And if there's a crush tube in there, tighten the nut a bit more using a long wrench or rattle gun (CAREFULLY) and u can improve the backlash. Worth trying before u pull it apart. It worked for me!
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Post by bad_religion_au »

hmm i had similar symptoms and it turned out to be my T case idler bearings... but your probably in luck, you've got a split case so they're stronger.
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