741 case 3.23 differential questions

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Brooks James

Brooks James

VET, CPT, Huey Medevac Pilot
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See pics, don't know enough to interpret what you see
Changed directions to cruiser , daily thrashing, 4000
Rpm at 80 mph with 3.91 no go
I want to use this 3.23
What does the gear mesh pattern reveal besides rust
I can download more pics later

PXL_20240219_202322495.jpg
 
It'll be really noisy for a while.
The roller bearings will likely be as rusty/pitted as the gears, they'll create heat and boom.
You're buying the case only, and not the preferred one either.
Good luck. jmo
 
Nothing wrong with a 741 case. I agree about the bearings though. You should remove the carrier, make sure the bearings are good and clean and not pitted. Run a wire brush over the ring gear. Remove the pinion and do the same, then reassemble.
 
Am I the only bonehead who can't see a gear mesh pattern in that photo?

I'd measure the backlash, pull it apart, clean the gears really well with a wire wheel, inspect the hell out of the bearings, reassemble keeping the backlash the same as it currently sits (assuming it's in spec), and run pattern with grease/marking compound.
 
mopowers said:
Am I the only bonehead who can't see a gear mesh pattern in that photo?

I'd measure the backlash, pull it apart, clean the gears really well with a wire wheel, inspect the hell out of the bearings, reassemble keeping the backlash the same as it currently sits (assuming it's in spec), and run pattern with grease/marking compound.
Click to expand...
No, I'm a bonehead too because I cannot see it either.
 
741s have a pinion bearing spacer as opposed to a crush sleeve. Make sure you don't loose track of any pinion shims that might fall out if you take it apart.
 
junkyardhero said:
i'll also say that most of us have probably run something just as rough or worse looking.
Click to expand...
Ran my 741 missing 3 teeth for a season. I did remove them and the culprit that caused it all. (Long story) :BangHead:
I run a 741 in my small block and a 742 with my Big block. I like shimming better than crush collars but that's just me. They make a spacer to eliminate using one on the 489 case.
 
I've cleaned up gears that were no rusty than that and they were quiet afterwards. But the guys have a point about checking the bearings since there's rust on the gears
 
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