Trying to decipher if I have a Suregrip in my truck. This rear-end was swapped into my truck before I bought it. It is not original. it has allegedly 2.76 gears, has a "X" on either side of it with a dot above it and below it and has the numbers stamped on the driver's side that read:
"2070741
25"
Exactly like that... but the "25" is below the "41" I have no idea if that matters. oooo also, there is no tag on this thing. These stamped numbers on there are the only markings.

Just trying to make sure... Pun intended.

THANKS GUYS!

-Marc

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1965 D100 225 slant 6, NP435 Utiline.

Jack one rear wheel off ground, place transmission in Neutral, and with parking brake off, try turning the raised wheel by hand. If it turns; you don’t have a Surgrip differential.

Caculate your rearend ratio by this method.

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67' Dart GT Convertible; the old Chrysler Corp.
82' LeBaron Convertible; the new Chrysler Corp
07' 300 C AWD; Now by Fiat, the old new Chrysler LLC

Cool. That settles it then. I do not have Suregrip. THANKS!!
I will calculate my exact ratio later this morning using that method.



-Marc

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1965 D100 225 slant 6, NP435 Utiline.

EXCELLENT. It's official... I have a 2.76 rear. lol

THANKS GUYS!! flawless method.

-Marc

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1965 D100 225 slant 6, NP435 Utiline.

also u have a "741" case

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1965 Plymouth A/FX 512ci (under construction)
1968 Dodge Dart SL6 14.25 @ 91.5 1.91 60'
1973 Dodge Dart SL6 Stock
Killer Bee's Member Since 09'
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Sorry to be a noobie... but is that good? Is that important when looking for parts, hauling or doing burnouts? Lol what other cars/trucks used that case? I would to love what vehicle my rear came from.

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1965 D100 225 slant 6, NP435 Utiline.

The 741 center section for the 8 3/4 rear ends went form 1965-1974. I believe its pretty popular on most 8 3/4 rears. Can't tell you what its from, but it has to be something 1965-1974 and could be from a car, truck or maybe even a van? I know that the Darts/Valiants could have an optional 8 3/4 which (I think) only came with the 741 pumpkin. So I guess most cars (with 8 3/4 rears) would have had these cases.

As far as how good it is to have a 741, I think most people prefer either the 742 or 489. However having an 8 3/4 is probably plenty more than enough for a slant when it comes to hauling and burnouts. I believe parts are more easily had for the 742 and 489 though.

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'66 Dodge Dart

I have a 3.91 SG 741 rear that I've hammered in my '66 for ages. The 741 gets a bad rap from those that just have to have a 489 case. I think it's fine.

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Official Cookie and Mater Tormentor.