2.76 or 2.94 Sure Grip

[65 Dartman]

If I was looking for one, what would be a fair price for a 2.76 or 2.194, not including shipping. Besides the sure grip, I’m guessing the case number have a bearing on price. I would think in order of value - #1 would be a 742, then 489 finally 741. Thanks for any input or opinionss

 

[George Jets]

I like the 2.94 gear ratio for basic all around driving. (and today's freeway speeds)

Needs the 741 carrier to go with those gears. Still reliable, still strong.


☆☆☆☆☆

 

[Dana67Dart]

489 is most desirable
742 next most
741 least.

489 has the most gear combinations available
742 next most
741 the least

 

[junkyardhero]

as a data point i just sold a really nice 742 3.91 SG for $550 and two springs ago i sold a Junkyard Fresh™ 741 2.91 SG for $450

i'll keep my comments to myself regarding cases

 

[QuickDart360]

3.91's are nice snappy gears!

 

[Syleng1]

There really is nothing wrong for a mild street car with a 741 case. I’d take it any day of the week over an 7-1/4”
2.76 over the other.

 

[65 Dartman]

489 is most desirable
742 next most
741 least.

489 has the most gear combinations available
742 next most
741 the least

I figured the 742 as #1 since the SG clutches can be rebuilt and beefed up whereas the 489 not easily refurbished

 

[j_anderson]

as a data point i just sold a really nice 742 3.91 SG for $550 and two springs ago i sold a Junkyard Fresh™ 741 2.91 SG for $450

i'll keep my comments to myself regarding cases

I’m looking for a SG 2.94. Any other junkyard fresh units in your area?

 

[Dave999]

I have not got any knowledge of 8 3/4 centres
but i do know that the long ratios in some axles have to be fitted to a different version of the center than the short

for example a centre for 2.77:1 ratio gears would have its ring gear flange offset by 1/4 of an inch towards drivers side from a centre that took 2.92:1 up to 4.11:1

ie if the pinion head Is huge, to get enough thickness into the ring gear they needed to offset its mounting flange on the centre section.

I have no idea if this is the case with any of the 8 3/4 centres but mention it just in case

 

[junkyardhero]

I’m looking for a SG 2.94. Any other junkyard fresh units in your area?

not at the moment. when i get them, they tend to sell rather quickly.

 

[Desoto291hemi]

I have not got any knowledge of 8 3/4 centres
but i do know that the long ratios in some axles have to be fitted to a different version of the center than the short

for example a centre for 2.77:1 ratio gears would have its ring gear flange offset by 1/4 of an inch towards drivers side from a centre that took 2.92:1 up to 4.11:1

ie if the pinion head Is huge, to get enough thickness into the ring gear they needed to offset its mounting flange on the centre section.

I have no idea if this is the case with any of the 8 3/4 centres but mention it just in case

Negative,,,it is not an issue with the Mopar 8 3/4 rears .

Tommy

 

[Dave999]

Negative,,,it is not an issue with the Mopar 8 3/4 rears .

Tommy

thought that might be the case but over the years have seen a number of guys fall into the trap.... nice new centre and a set of gears that just will not fit.... similar to getting caught out with pinion depth when fitting a tru track can't get it right cos the flat face of the head hits the main body of the centre. needa a few thou taking off..... but only with the gears up to 3.23:1 i.e big fat pinion head not a problem with 3.5 3.7 or 3.9.
Dave

 

[65 Dartman]

After posting a Want Ad here and on FBBO with a possible on FBBO for a 2.76 SG, I decided what the heck and contacted Dr Diff. He said he had a 2.94 with a brand new clutch SG he assembled in a 741 case. It’s now on the way with delivery due on the 12th

 

[MMissile]

After posting a Want Ad here and on FBBO with a possible on FBBO for a 2.76 SG, I decided what the heck and contacted Dr Diff. He said he had a 2.94 with a brand new SG he assembled in a 741 case. It’s now on the way with delivery due on the 12th

Exact combo I have in my Gen-III `cuda. With the modern transmissions [5-8 speed], it has plenty of low and top end. I could have rebuilt it with a 2.76, but it's already too fast for a ragtop.

Yup, that's Joe Pappas tightening the nuts.

 

[j_anderson]

After posting a Want Ad here and on FBBO with a possible on FBBO for a 2.76 SG, I decided what the heck and contacted Dr Diff. He said he had a 2.94 with a brand new SG he assembled in a 741 case. It’s now on the way with delivery due on the 12th

Nice! What was the cost?

I am converting from 3.55 to 2.94 too. Found an open 2.94 (742 case) and bought the sure grip unit and bearings and seals from dr diff. Then I took it all to some local guys who were former Dana employees. They do this work as extra cash in retirement

With buying all the stuff and paying for setup, I’m around $1100

 

[496 polara]

I would love to have a 2.94 for my Newport. I don't do long distances so the 3.23 should be fine when the 8 3/4 gets swapped in later.

 

[65 Dartman]

Nice! What was the cost?

$800 for the unit and $128 UPS shipping to here in VA

 

[j_anderson]

That’s a DEAL!

$800 for the unit and $128 UPS shipping to here in VA

 

[65 Dartman]

Guy over on FBBO offered me a 2.76SGfor a grand plus shipping. I decided to wait and a friend said why don’t I check with Randy’s or Dr Diff. The good Dr answered my email right away and the rest is history

 

[AJ/FormS]

I figured the 742 as #1 since the SG clutches can be rebuilt and beefed up whereas the 489 not easily refurbished

Hang on friend;
the Cone-types are just as easy and usually cheaper to refurbish, than the clutch-type; and on the street, when properly set up, I kindof prefer them;
and they fit in any case with the correct bearings.
I have done several, with success;
and still have some in stock.

I normally run 742 cases behind my HO367, that by the math, is making over 400 hp., and I have been running 295s back there for over 20 years.
At one time, I had at least one of every rear ratio from 2.76 to 5.13; except never had 3.73s, nor 4.56s.. all of them installed in whatever case, and most with the Cone-types; all set up by myself. IIRC only my 4.30s were in a 489, and with a Trac-Loc. I mostly ran those at the track with 325/50-15 BFG, Drag Radials, so I wasn't taking any chances. At first, I ran those with a spool, but one weekend is all it took to convince me that a spool on the street with big tires was NOT for me.

OOPs!, late to the party, yur all set already

 

[abodyjoe]

even the 741 with a sure grip are bringing decent money these days. i have two 741 cases with the clutch sure grip units. the sure grip will interchange between centers. took the 3.23 out, installed a 2.76 and may end up with the 2.94 after i buy a sure grip unit and have it gone through. 2.94 is a real nice gear.

 

[Dana67Dart]

but it's already too fast for a ragtop

the faster you go, the cooler (pun intended) you will be!