pinion swap in 8 3/4

[frederick_76]

Ok, I hav a 489 carrier for my 8 3/4 and iam wanting to change the ratio in it. My cuz. has the ratio I want but the rin and pinion is in a 742 carrier....So......#1, Can the ring and pinion be taken from the 742 and be put into the 489?? If not....#2 Is the 742 strong like the 489 (so I was told is the strongest one)?? If the 742 is strong I will just use the carrier with the gears in it. Thanks..

[dwc43]

The gears want swap between those two carriers, but both cases are equal in strength so just swap them that way.

[frederick_76]

Cooll, thanks for the info dwc43.

[dwc43]

Welcome, anytime.

[dave571]

Either of you guys got a spare 489 or 742 case(case only, no gears)

I'm having a hell of a time finding one.

[gsmopar]

Originally posted by dave571
Either of you guys got a spare 489 or 742 case(case only, no gears)

I'm having a hell of a time finding one.

I have a 742 with 4.86:1 and clutch style posi. PM me if interested.

[Mister Fiberglass]

Originally posted by dwc43
The gears want swap between those two carriers, but both cases are equal in strength so just swap them that way.

What ??..........the ring and pinions will NOT swap between the two cases and the 742 is a stronger and better case.

[dwc43]

Read both his post and mine again. It say you cant swap the gears and if you had read both post you would see that I said to go ahead and swap his case and gear for the other case and gear he has available to him. I was leaving the post to him not you. So if you cant read between the dam lines then but the hell out. You been on my case all night long and I aint said or done a dam thing to ya and I'm pretty tired of your petty ass bullshit. Get a life and leave me and every the hell else alone.

[dwc43]

And furthermore I hate the fact that I let the likes of you drag me down to your sorry ass level.

[Mister Fiberglass]

I have been on your case because of the very misleading and sometimes downright FALSE info that you post.

And about the 8 3/4 case?..........why then did Mopar, Mark Williams and OTHERS choose the 742 to do any major aftermarket work with ??

BECAUSE it is a better design.

Then WHY did Ma Mopar go to the 489 case from the 742 case to begin with................. ???

SHOW us all how much you know..........WHY did they ??

[dave571]

Originally posted by gsmopar
I have a 742 with 4.86:1 and clutch style posi. PM me if interested.

Shipping something that heavy to Canada is simply a dream. Otherwise I'd be interested. Thanks for the offer.

An empty case should be light enough to mail, and after market gears and such a reasonable price.

[ehostler]

Mister Fiberglass - please stop trying to start wars. I'm tired of cleaning up the threads, behind you.

You started this little war becasue clearly dw had a typo ('want' instead of 'won't'). Everyone could tell that it was a typo, but you chdecided to fight him on it.

Please STOP this.

MOD

[Mister Fiberglass]

ehostler.............

Do you condone him posting WRONG info ?

THAT is the main problem I have with him. Because he has such a high post-count - some people TAKE this info that he posts as FACT.......

When it clearly is not.............just an example above...

Him stating that the 42 and 89 cases are the same strength....they are NOT.

And there are a BUNCH more examples.

And we are NOT talking about PREFERENCES.......like if he prefers a 89 over a 42 case. OR if he prefers a RED car over a blue one.

OR is this a site that is based on Mopar fantasy and not FACT.

[Slant Cecil]

It's not so much of case strength that makes the 742 more desireable over the 489, it's the crush sleeve that the 489 uses that makes the 742 better for HP use. There is a spacer for the 489 that will eliminate the crush sleeve, making both rears about equal.
I have to agree with Mr Fiberglass, everyone has a post with misinformation from time to time, but dwc43, even though he makes a good point from time to time, seems to be the KING.

Cecil

[John Kunkel]

The superior strength of the 742 has nothing to do with the case itself but concerns the rear pinion bearing size.
The rear pinion bearing in the 489 has 15% less thrust and radial load carrying capacity than the 742 (straight from the Timken catalog). While much is made of the crush sleeve in the 489, it is really a non-issue with the addition of a solid spacer sleeve but the 489 simply can't be brought up to the overall strength of the 742.

Out-of-date beliefs, personal preferences and brand loyalty are the source of much misinformation in tech boards and serve no one.

[FearThe4Doors]

ive always heard the 489 was the best to have. guess not

[Mister Fiberglass]

Originally posted by FearThe4Doors
ive always heard the 489 was the best to have. guess not

The whole OVERALL package of the 42 is better than the 89...in alot of people's opinions.....the people who invest $$$$ in still marketing the product.

AGAIN....why would Ma Mopar make the new alum case from the 742 format instead of the 489 ?

And SC........ I have errored in the past and admitted same......the most recent one that comes to mind is me saying that there was not a large production of /6 727 transmissions. I was wrong. And I admitted my error.

dwc ?? ......... he hides behind his keyboard and just uses foul language. And says things that are NOT based in fact.

It has NOTHING to do with starting a "war" or whatever.