Diff

[ROOK1]

I have a '71 with what I beliebve to be the stock rear end. It has recently started to make some noise and appears that the pinion bearing has gone bad. Is it possible to replace this bearing and seal without tearing down the whole rear end? If a tear down is necessary, I think I would rather replace the whole rear end with a used one. Is there a difference between rear ends in pre '74 vs '75 or later? Mounting points for springs and control arms…….

[Exit98]

Rook,

We just had this discussion, look here:

http://www.fiatspider.com/f08/viewtopic.php?f=3&t=15

and there are others too. Try searching on rear end and differential.

I made the switch to a later rear with the 3.90 gear set and couldn't be happier. I'm actually glad now my original diff failed.

PM me if you want details on the switch.

Good luck.

[Exit98]

Rook,

Just about every subject imaginable has been explored on this great site. The search feature works real good. You could be reading for hours.

[ROOK1]

Thanks Exit98 but your link didnt work. Ill do some searching.

[Exit98]

Sorry Rook,

Try this one:

http://www.fiatspider.com/f08/viewtopic.php?f=3&t=15453

[124JOE]

the first link was right, but page 2 has alot of info on this.joe

[fiat218]

why is the 3.90 so good

[124JOE]

the 4.10 is for scooting around town and pulling 5 grand on the tac at 65 mph
the 3.90 is better for travling less rpm at highway speed =better gas milage.joe

[fiat218]

hmm i wonder what in mine

[124JOE]

if you can drive around in 5th under 35 without it getting jumpy then you have the 4.10
i can almost startoff in 2nd

[fiat218]

i start off in second all the time, 1st seem so low

[124JOE]

then you have the 4.10

[fiat218]

well damn it then lol

i wonder what the other 69 has in it hmm

[WYSpider]

4.10 is great for the mountains.

[124ADDHE]

3.90 is fine if you have the torque