moparjohnny
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Was it the 741,742,489 as far as standard cases? Thanks
What rear case number came on 69 roadrunner 383 eng
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489
Propwash
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Depends on how early or late in that year your car was built. Mine was built in January and came with a 742 case. '69 was a transition year.
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yeah I'm sure a few were built with the left over 742 cases from the run thru 1968, probably 90% will/should be 489 cases thou in 1969, you can see right on the side of the carrier, it will have the casting #'s on the front side, the last 3 #'s will be your carrier case type #... check to make sure, what you have before ordering any parts.... someone could have swap out rear ends, with an earlier unit, it's not all that uncommon, even @ the dealership, under warranty replacement, back in them days.... Model years came out in Sept. of the previous year to the model year & they used what they had sometimes, allot of documentation wasn't completely accurate either, early production models have crossover/leftover parts, from the previous model years sometimes....
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Propwash
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Figures.....I get the flippin left overs. LOL Actually I don't mind. Didn't have to deal with a crush seal with the 489 case
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Yeah I like the 742 carrier too... some will say it's weaker than the 489 tapered larger pinion, but I doubt it really is... never broke one yet, had nearly 950hp going thru my last 68 RR with N20 & a 3.73:1 742 case... The Aluminum Race Case from Mopar Performance is a 742 Case too, there must be a good reason for using the 742 instead of the 489 case design....
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bigmanjbmopar
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mine has the original 489. PS mine was built in January as well maybe i's the plant?
Propwash
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I'm telling you man, I got the scraps...lol
950HP Bud? Geesh...think I should be ok then...lol
red 69 runner
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My car was built Oct 68,its got a 489 and also a black 68 beep beep horn?
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It was with hardened 35 spline Axles, Spool {I hated}, with a truss support welded on the rear, CalTracs... with the stock 31 spline axles, std. street gears & axle housing, I would never have even tried it, but I never broke the 742 Carrier either, sheared a few teeth on Pro Gear rings before thou, with 5000rpm Trans-brake & N20 launches....
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on motor only or street tires, I never had an issue with the original 742 carrier, housing, diff & street gears... Once you put N20, or especially slicks or drag radials & trans-brakes, things should/need to be beefed up some, to be safe....
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