suregrip

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Floor it!!!!

LOL

Jack it up turn the wheels with the car in neutral.... most of time both wheels will turn in the same direction... mine does.
 
mullinax95 said:
Floor it!!!!

LOL

Jack it up turn the wheels with the car in neutral.... most of time both wheels will turn in the same direction... mine does.
Click to expand...
When you look in the rear view mirror this is what you should see. Steve
 
lift both rear wheels off the ground, its an open rear if you rotate one wheel and the other one turns freely in the opposite direction with the trans in park (auto) or in gear (manual) it is a sure grip if both wheels want to turn in the same direction with the trans in neutral but dont want to turn with trans not in neutral
 
I have found alot of third members in junk yards that Ive pulled thinking there were one wheeler peeler and found good clutch type sure grips, Its worth the look. Look in old 57-72 dodge pickups. Red neck gold mines. Oh yah don't beleave the hype about 741s being week, I have ran several behind built 440 with no problem, and if your going to run slicks stay away from the cone type sg there week. good luck.
 
I hammer the crap out of my 741 and it has broke yet.
 
on the housing is has 741 so is this a indication of suregrip, i dont own a floorjack that works or i would jack it up and do the test of turning the wheels
 
No, but some have tags on the bolts that hold the third member on that say s/g, and maybe a tag that has the gear ratio. When you do buy a jack, buy some jack stand to. These 8n 3/4 are very easy to pull apart and put back together, kind of fun to.
 
iggys68dart said:
on the housing is has 741 so is this a indication of suregrip, i dont own a floorjack that works or i would jack it up and do the test of turning the wheels
Click to expand...

No, 741 is just the model of 8 3/4", there's also the 742 (newer) and 489 (newest). All have different pinion shaft diameters and designs among other things.
 
I found this. I have a set of 3:91s in a 741 case I hope to use summer 2011 so if the hype about them being weak is BS. That is a good thing. Right now I am running an open 3:23 in a 489 case.

1-3/8" small stem pinion (aka. '741')
Carrier casting numbers: 1820657 (1957-1964), 2070741 (1964-1972).
This assembly was typically used in low weight/low horsepower applications through low weight/medium horsepower and high weight/low horsepower applications.
Pinion depth and bearing preload is set with shims.

1-3/4" large stem pinion (aka. '742')
Carrier casting numbers: 1634985 (1957-1964), 2070742 (~1961-1969).
This assembly was replaced by a phase-in of the 1-7/8" pinion starting in the 1969 model year. 1970 RW (Plymouth and Dodge mid-size) were the last models to use the 1-3/4" which appeared in a 2881489 case. This assembly was typically used in high weight/medium horsepower applications through high weight/high horsepower applications.
Pinion depth and bearing preload is set with shims.
1-7/8" tapered stem pinion (aka. '489')
Carrier casting numbers: 2881488, 2881489 (1969-1974).
This assembly was introduced in 1969 and was phased-in to relace the 1-3/4" unit through 1970. Note: the 1-3/4" pinion also appeared in some '489' carriers during this period. By 1973, the '489' was the only unit available in passenger car applications. This assembly was typically used in high weight/medium horsepower applications through high weight/high horsepower applications.
Pinion depth is set with shims, preload is set with a crush sleeve.
Through 1965, the factory ratio was stamped on the identification boss, followed by an 'S' if Sure Grip equipped. After 1965, a tag was affixed under one of the carrier mounting nuts to identify the ratio. If Sure Grip equipped, an additional Sure Grip lube tag was sometimes affixed; later years sometimes had the filler plug painted orange.
 
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