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Post by jeremy on Jul 1, 2022 14:29:39 GMT -5
Does anyone make axles for the pre-95 8 1/4 axle? I can't find them anywhere.
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wp29p4a
Forum Regular
MY 1974 se
Posts: 376 
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Post by wp29p4a on Jul 3, 2022 12:14:14 GMT -5
Looks like Summit Racing has them.
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Post by jeremy on Jul 4, 2022 6:10:20 GMT -5
Where? I found a bunch of post 95 axles, which will have 29 splines instead of 27. Everything appears to be for Jeep, which may or may not make a difference. I don't think aftermarket Jeep axles will be weaker than my 100,000+ mile, 50 year old stock axles, but the metallurgy may have been engineered for different loads. I'm just taking a wild guess, but it seems like the axle would see different forces from a muscle car doing burnouts than a Jeep crawling rocks.
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Post by Nacho-RT74 on Jul 5, 2022 7:00:58 GMT -5
Doctor diff?
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Post by jeremy on Jul 5, 2022 19:13:02 GMT -5
I've looked a few times and can find everything but 8 1/4.
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Post by Nacho-RT74 on Jul 6, 2022 1:08:21 GMT -5
Yeap, just checked... same deal with Randys pinions
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DynoDave
CO-ADMINISTRATOR
Motown Mopar-Wizard
Posts: 11,160
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Post by DynoDave on Jul 8, 2022 6:41:53 GMT -5
Very interesting. I would never have guessed this would be a hard part to find. I wonder what years interchange?
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Post by jeremy on Jul 8, 2022 12:29:04 GMT -5
AFAIK every year up to 95, when the spline count changed to 29, should interchange. If 8 1/4 owners have to shop used though, how many junkyard axles are still out there, and how long will it last?
A forum member on For B Bodies Only suggested I have 8 3/4 axles custom cut for 29 splines, and use a 29 spline differential, which is why I was trying to find out if there were any other changes made in 95 that would prevent the 29 spline diff from working in the pre-95 axle.
I spent a few hundred buying upgrade parts for the 8 1/4, only to get hung up on this question. I've been thinking about putting a 27 spline diff in and using the weaker axles as a temporary solution, but it doesn't look like that's going to work either. I was hoping to keep the car light and efficient (for what it is), but I may end up doing the typical thing and swapping in the 8 3/4 or Ford Explorer axle.
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Post by Nacho-RT74 on Jul 9, 2022 4:42:48 GMT -5
Well, the 8.25" is as far I know the most used all around axle, specially since 72/73 when engines where detuned. So there should be lots around yet
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DynoDave
CO-ADMINISTRATOR
Motown Mopar-Wizard
Posts: 11,160
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Post by DynoDave on Jul 12, 2022 19:17:07 GMT -5
Lot's of 8.25" axles in '75-'79 Cordobas (in all late b-bodies, actually).
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