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so i spent the afternoon reading posts about the interchangeblity(is this even a word?) of chunks through out the yrs.
and just to clarify, a 75 3rd will bolt in a 77 axle using the 77 axles, correct? the pinion flange should also be the same as well?
 
you are correct . Pinion flange changed in early 70's I think maybe in 75 so it may be a production date question. I also thought that cruisers went non c-clip at some point hopefully after 77 for what you are asking .
 
peesalot said:
you are correct . Pinion flange changed in early 70's I think maybe in 75 so it may be a production date question. I also thought that cruisers went non c-clip at some point hopefully after 77 for what you are asking .

Mostly right, but pinion flanges were the same 75-84 (same bolt pattern anyway, the earlier flanges were cast, later ones machined), C-clips stayed until 1994 if your 80 series had drum brakes in the rear with the associated semifloat axle.
 
Cruiserdrew said:
Mostly right, but pinion flanges were the same 75-84 (same bolt pattern anyway, the earlier flanges were cast, later ones machined), C-clips stayed until 1994 if your 80 series had drum brakes in the rear with the associated semifloat axle.


Big red family fued X....


Fine spline pinion started in 1978...



;)
 
'75 chunk is the same as '77...

Pinion flange changed from small bolt pattern to large bolt pattern for '74. Same time as 4spd. IIRC

Not sure when in '78 fine spline started though. I've seen course splines in early '78.

FF axles don't use c-clip but that is another topic...
 
hammerhead said:
'75 chunk is the same as '77...

Pinion flange changed from small bolt pattern to large bolt pattern for '74. Same time as 4spd. IIRC...

A few months later. 4 speed came in 9/73, the larger U-Joint and flange in 1/74





hammerhead said:
Not sure when in '78 fine spline started though. I've seen course splines in early '78....


78 model year started in 9/77 [look to addition of side defrost option, overhead windshield squirter nozzle] fine spline pinion a few months later. You guessed it, 1/78
 
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