they are all interchangable right? i have a 66 rear with the small bolt pattern and 3.23 gears and i just put a 75 rear with 2.73's and they just arent cutting it. if they are interchangeable i would like to put the 3.23's into the newer rear. any help on this would be great.

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1966 Plymouth Valiant, 225, 3 on the tree, 8 1/4 3.21 sure grip, hyperpac, holley 650dp, holset h1c

I'm about to do the same thing and just went through the same round of questions. Consensus seems to be that it should work just fine.

*edit*
I did notice that there is a difference between early and late in the size of the pinion nut but I don't know when the change was made. I have 3 rears with a small nut and 2 with a large one. The 2 of the 3 small ones came from '62 cars while the 3rd I believe came from a '64. One of the large ones is in a '62 but I don't believe it is original and the other came from a '74. I believe - but am not certain - that the seals, pinion bearings, side bearings, etc. are all interchangeable.

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David Kight
'62 Valiant Signet, White
'98 Dodge Dakota
'06 Jeep Liberty

Growing older is unavoidable but growing up is strictly optional.

Your 3.23 gears will direct interchange intop the later rear.......and like the ones I swapped 7 years ago will last as long as you keep your foot out of it.

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Yeah....Im the one who destroyed this rare, vintage automobile.....

thanks for the replys. as for keeping my foot out of it..... i dunno. i blow through these rears like nothing(spider gears) and im trying to save up for something better but thats just not gonna happen any time soon.

thanks, Junior.

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1966 Plymouth Valiant, 225, 3 on the tree, 8 1/4 3.21 sure grip, hyperpac, holley 650dp, holset h1c

You know, I have gone through (3) of these rears in 6 years. I drive 120 miles a day, not hard, but alot of miles on twisty two lane roads........I finally broke down and went with modifying a C-body 8 3/4 rear. Yes, it has to be shortened to fit, but what a welcome relief. I can stand on it anytime I want and bust the wheels loose and not have to worry about it. I had Randy's Ring & Pinion go through the rear end and they do a superb job setting it up. It is nice to have the 10" brakes too. They have saved me more times than I can count.

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Aggressive Ted

http://cid-32f1e50ddb40a03c.photos.live ... %20Swinger


74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG

i do plan on going with a bigger rear sometime in the near future but i just dont have the money to do that right now, but i have parts laying around for the piece i have now so...

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1966 Plymouth Valiant, 225, 3 on the tree, 8 1/4 3.21 sure grip, hyperpac, holley 650dp, holset h1c