Slant Six Forum :: Ideal Rear End

I have a 76 LPB 7-1/4, with the larger bearings, in my 69 Barracuda.

I was working on the brakes last weekend and noticed the endplay in the axles. I haven't put a dial indicator on them yet, but it feels like endplay in the neighborhood of .010".

Unless I'm missing something, it seems that this end play is determined by the amount designed in, taking the production tolerances into account.

Is this correct, and the outer rings are supposed to slide in the housing, or am I missing something?

Bob

Author:	slanted87 [ Thu Dec 02, 2010 1:20 pm ]
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I'm going to put a Granada 9'' in my 65 Dart.

Author:	Joshie225 [ Thu Dec 02, 2010 1:52 pm ]
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Quote: I have a 76 LPB 7-1/4, with the larger bearings, in my 69 Barracuda. I was working on the brakes last weekend and noticed the endplay in the axles. I haven't put a dial indicator on them yet, but it feels like endplay in the neighborhood of .010". Unless I'm missing something, it seems that this end play is determined by the amount designed in, taking the production tolerances into account. Is this correct, and the outer rings are supposed to slide in the housing, or am I missing something? Bob The axle bearing should not be moving in the housing. With the bolt-in-axle 7 1/4 the axle bearing controls the axle location/retention. It sounds like you have a bearing on the way out. I would pull the axle and see if there is play in the bearing. Later model tapered tube 7 1/4 axles use C-clips and straight roller bearings like the 8 1/4. Those will have some axle end play normally.

Author:	slantvaliant [ Thu Dec 02, 2010 2:19 pm ]
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Quote: I'm going to put a Granada 9'' in my 65 Dart. Which ratio do you have or are you still looking? They came with 2.48:1, 2.58:1, and 2.75:1, IIRC, not exactly performance ratios. My son's Monarch (Granada in Mercury drag) had the 2.48, and you could tell. Even with a 302, it was slow. Are you looking at a disk brake unit? Granada/Versailles Info I have my feelers out for a 5-bolt Maverick/Mustang rear with a decent ratio - around 3 or a little higher would be good - or a decent 8 1/4" Mopar rear. I'd love the 8 3/4", but it'd cost a bit to change the bolt pattern, etc and I really don't need the extra strenght/weight.

Author:	slanted87 [ Sat Dec 04, 2010 11:42 am ]
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It was originally 2.75:1, but is now 3.25:1 trac-loc.

Author:	Tim Keith [ Tue Dec 07, 2010 10:26 pm ]
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Chevy used a 7.5 inch ten bolt axle behind the LS1 V8. The 7.5 is marginal with 400 HP for sure but many take lots of thrashing because of the posi. Something similar would be okay for a slant six. My brother's '99 Z28 still has the original 7.5 and his car runs 12s quarter mile. Clutches have failed but the little 7.5 keeps going.

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Author:	Joshie225 [ Tue Dec 07, 2010 11:15 pm ]
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I agree if the 7 1/4 had better parts available it could be a lot more robust. Fix the spider gears, carrier, pinion, axles and axle bearings and it could be a good little axle.

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