changing ring and pinion and keeping Sure Grip

[Corey Dean]

Rear end is an 8 3/4. 742 case, with 4:89 gearing and Sure Grip. The 4:89 gearing is too much for normal street driving and the ring/pinion are worn. It whines like crazy once you get up around 25 MPH or more.

Can the ring and pinion be changed out to 3:55 gearing while at the same time keeping and using the sure grip that is in there currently?

I hope that isn't a dumb question with an obvious answer, although I feel it is lol. I'm learning and educating myself however sometimes you just need to ask when you can't find the answer on your own.

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[comet_666]

http://www.doctordiff.com/8-3-4-489-case-third-member.html

Dr Diff is a good place to start.   


Or you can buy the gears themselves and a rebuild kit and do it yourself.

[Kern Dog]

Y E S.

[Corey Dean]

Thanks guys.

I don't believe I need a whole new third member. I think changing out the worn ring and pinion for new will make a world of difference. Being able to change to 3:55 gearing will be a blessing too.

And not having to purchase a new sure grip unit helps too.

[John_Kunkel]

Unlike some other rear ends, the 8 3/4" doesn't use different main cases or different differentials for the same pinion size gear set....so any 1 3/4" pinion gear set will fit your existing 742 case.

http://www.doctordiff.com/8-3-4-ring-and-pinion.html

[Corey Dean]

Thanks again.

I will be ordering this: http://www.doctordiff.com/8-3-4-ring-and-pinion.html

And this: http://www.doctordiff.com/green-bearings-pair.html

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