Dale Z

Does someone know how by looks or a number know how to identify a 4 series carrier, one that is used for 4:11, 4:56 as opposed tp the 3 series? Thanks Dale e-mail VAL56@AOL.com

mapman

Dale Z,

I believe all 1963-79 used the same carrier p/n 3917861, irrespective of gear ratios.

redvetracr

There is DEFINITELY a difference, to use a 4 series gear (3.9-4.56) on a 3 series case you need a ring gear spacer so does that mean the 4 series carrier has a thicker ring gear mounting flange?? I think so. ..redvetracr


[Modified by redvetracr, 10:22 PM 2/2/2003]

mapman

My information source is the Corvette parts fiche. The carrier is in group 5.505, the ring gear and pinion combinations are in group 5.529. The fiche shows only differential carrier p/n 3917861 for 1963-79. Is there a better data source for these carriers? Thanks

mapman

The differential case (not carrier) does have different part numbers. In group 5.510.

These are differential case part numbers with positive traction. (There are different differential case numbers listed for cars w/o p/trac.)

P/N 3997926 for 1963-80: 2.73, 3.08, 3.35, 3.55, 3.70

P/N 3997927 for 1963-77: 4.11, 4.56


[Modified by mapman, 12:41 AM 2/3/2003]


[Modified by mapman, 1:38 AM 2/3/2003]

jimtreber

Has anyone ever seen the 4.88 ring and pinion? It had a chev part number available only over the counter ready to bolt in a 4 series. I actually bought a set many years ago for my C2 fuelie. And they were quiet.

1976 406, 12 to 1, TH400 3000stall switchpitch, 4.11, nitrous, 12.14 on radials

redvetracr

mapman,
My book shows the 4-series case as 3997928
...redvetracr

Gordonm

I wish I could post a picture. I have 2 pictures of a 3 series and 4 series carriers right next to each other. There is definitly a difference.
Lets try this.left is 4 series right is 3 series



[Modified by Gordonm, 7:51 PM 2/5/2003]


[Modified by Gordonm, 7:52 PM 2/5/2003]

JoeC427

:cool:

mapman

redvetracr,

Thanks, you are correct - the ...927 case is w/o positive traction.

vettedreams

Sure wish I had that 4 series!

ram82fire

They are available @ toms diffs .

geo

Gordonm

Mine is for sale if you are interseted.

'79ProwlerOrange

Cool. this is one of those very informative threads... :cool: Im even happier i have a 4-series now :D (4.11s) i think 4.88s would be a little nuts!

vettedreams

I have a 4.11 gear ratio, can I still have this in a 3 series carrier? or is this why I have to use the ring gear spacer? And what do you want for your 4 series?

Gordonm

Yes you need a 4 series carrier. I had a 4.11 on a 3 series. That is why I got the 4 series carrier. I was going to swap it out but I blew the ring gear right off the 3 series carrier. Never got to install the 4 series carrier. I had a 3.70 ready to go so I just put that in. I would not recomend the spacer. I paid 200 for the carrier, I'll take 175 shipped to you

vettedreams

I too have broke all 10 bolts for the ring gear. The ring & pinion are still in excellent condition, can I just bolt these to the 4 series carrier? do I need a shim kit, thanks for the info, if I don"t have to fork out to much $ I think I"d rather have the 4 series, also will it fit in my case?

Gordonm

You should be able to bolt the ring gear right up. I would check the pattern and back lash any time I have changed anything in the diff. It is just cheap insurance. You might get lucky and not have to do anything. Then again you might have to shim it one way or the other. You can't tell until it is mocked up and checked. This case will fit from 65-79 Vettes

vettedreams

Gordonm, how about giving me your address and I"ll send you a money orderfor the 4 series, thanks.

Gordonm

OK sent you an IM but will also send an email