suregrip
Moderator: Moderators
All SureGrips are equal. It's the case that is up for debate here. There's the 741, 742 and 489. The 741 is the baby of the family and only good to about 400hp, although I've never seen anyone break one. Next up is the Taxi preferred 742, meaty casing but the pinion is slightly less beefy to the 489 which has a thinner case. 742 utilises a solid spacer for pinion depth as opposed to a silly Chrysler designed crush tube in the 489, but this can be converted to a soild spacer with aftermarket parts. 2 different factory SureGrips are clutch type and cone type. When the clutch type goes bad it's a straight forward clutch plate swap. When the cone type wears out you're into machining to make good again. Taxi uses 742 with 4.10s and a clutch type SureGrip. 318 nearly in the 12s, we don't need no stinkin' stroker motor! 
HTH!
HTH!<center>
The name is Kev, nowadays known as Kevvy or Pommie C***!</center>
The name is Kev, nowadays known as Kevvy or Pommie C***!</center>
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Anonymous
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Anonymous
Also, more people seem to like the clutch type than the cone type because it's a more effective suregrip. I went with a 742 clutch for my SB stroker, but my car will be heavier than yours anyway.
Assuming your car is an auto matty, and given the light weight, if you found a 741 than fitted the bill I would consider it. If you have to look for one I would go 742.
489's can be converted to the solid spacer as Kev says, but they were cone type suregrips.
741's and 742's were predominantly clutch types, though some of the later ones used cones before the 742 was replaced by the 489. Actually some people argue the 742 is as strong or stronger than the 489, certainly the rear pinion bearing is larger (so stronger there) but the 489 tapers so should have less stress raisers, plus is a larger diameter (1 7/8 as opposed to 1 3/4), also fine splines!
Yoy pays your money.........
Assuming your car is an auto matty, and given the light weight, if you found a 741 than fitted the bill I would consider it. If you have to look for one I would go 742.
489's can be converted to the solid spacer as Kev says, but they were cone type suregrips.
741's and 742's were predominantly clutch types, though some of the later ones used cones before the 742 was replaced by the 489. Actually some people argue the 742 is as strong or stronger than the 489, certainly the rear pinion bearing is larger (so stronger there) but the 489 tapers so should have less stress raisers, plus is a larger diameter (1 7/8 as opposed to 1 3/4), also fine splines!
Yoy pays your money.........
Gavin Chisholm - 414ci W2 Stroker SmallBlock Panther Pink '71 Challenger convertible - in bits
Car progress can be viewed here
Car progress can be viewed here
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Anonymous
this axle is not on my mope, its off a car i used to have a 69 right hooker barracuda.
sold it for scrap a few years ago
car was rotten, but apparently these uk cudas were built to formula s speck apart from the 318 motor the axle on that was a 741.
so me and a mate got that bit back to go in his b body thats why i asked how strong it was
sold it for scrap a few years ago
car was rotten, but apparently these uk cudas were built to formula s speck apart from the 318 motor the axle on that was a 741.
so me and a mate got that bit back to go in his b body thats why i asked how strong it was
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Anonymous
Who's Adam???
I assume by 'which one' you mean clutch or cone, rather than which housing or whether it's a suregrip or not?
You can tell but it's not easy unless the pig is out of the car! You can do it in the car if you are careful. the cone type uses springs which are visible through the suregrip unit casing. If you are careful you can take out the fill plug and get a light and or mirror (actually could try a digicam??) and rotate the diff while looking. If you see a spring, it's a cone.
much easier when they are out!!
I assume by 'which one' you mean clutch or cone, rather than which housing or whether it's a suregrip or not?
You can tell but it's not easy unless the pig is out of the car! You can do it in the car if you are careful. the cone type uses springs which are visible through the suregrip unit casing. If you are careful you can take out the fill plug and get a light and or mirror (actually could try a digicam??) and rotate the diff while looking. If you see a spring, it's a cone.
much easier when they are out!!
Gavin Chisholm - 414ci W2 Stroker SmallBlock Panther Pink '71 Challenger convertible - in bits
Car progress can be viewed here
Car progress can be viewed here
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Anonymous
