I currently have an 8 3/4 3:91 sure grip in a 741 case. This is too tall a gear for hiway driving and I don't want to go for an OD setup. Also, I am running a 440, and I have read that the 741 cases are more for small block cars. My questions are:
Is there a table that will tell you how many RPM you will drop per rear gear ratio? Like if I go from 3:91 to 3:73, at 70 miles per hour, how many RPM would I drop? 200 maybe? If I go from 3:91 to 3:55, 250 - 400 rpm maybe? I have an A-833 4 speed, not sure of 4th gear ratio, but I think 1 to 1?
Also, I am sure I would need to know how many splines on my axels and pinion before I order one right? Also, how do I tell if the yoke I have is standard or the large yoke?
Any tips or tricks for the installation? Any gotchas I need to watch out for? Common mistakes?
Here is the item number on ebay that I am looking at 380126195207. This is a 3:55 in a 742 case. Anyone used this guy? He has 100% positive feedback.
Does anyone on the forum rebuild these? I looked at parts to do the rebuild, about $400 for bearings and gears, not including the posi unit itself, not sure on labor, but probably close to the same or more. It just seems like a better deal to buy one done with a warranty than to build one. I have a 742 case, and I think the ebay guy said he would give $200 credit for it. Plus his stuff is buy it now or best offer. I saw him accept a bid for $980 for a 3:73 in a 742 case, all new components. If I got that deal and $200 for my case, that would be $780, I don't know how I could lose?
I also saw this on Craigslist: *3.55/742 CASE POSI, USED, CLUTCH TYPE, EXCELLENT CONDITION, NO ISSUES,INSPECTED, $675
The website for this one is http://www.rumblefishltd.net/ Anyone ever used this guy? For just a hundred more, I could have a new one and be rid of my extra case.
Ideas? Suggestions???
Is there a table that will tell you how many RPM you will drop per rear gear ratio? Like if I go from 3:91 to 3:73, at 70 miles per hour, how many RPM would I drop? 200 maybe? If I go from 3:91 to 3:55, 250 - 400 rpm maybe? I have an A-833 4 speed, not sure of 4th gear ratio, but I think 1 to 1?
Also, I am sure I would need to know how many splines on my axels and pinion before I order one right? Also, how do I tell if the yoke I have is standard or the large yoke?
Any tips or tricks for the installation? Any gotchas I need to watch out for? Common mistakes?
Here is the item number on ebay that I am looking at 380126195207. This is a 3:55 in a 742 case. Anyone used this guy? He has 100% positive feedback.
Does anyone on the forum rebuild these? I looked at parts to do the rebuild, about $400 for bearings and gears, not including the posi unit itself, not sure on labor, but probably close to the same or more. It just seems like a better deal to buy one done with a warranty than to build one. I have a 742 case, and I think the ebay guy said he would give $200 credit for it. Plus his stuff is buy it now or best offer. I saw him accept a bid for $980 for a 3:73 in a 742 case, all new components. If I got that deal and $200 for my case, that would be $780, I don't know how I could lose?
I also saw this on Craigslist: *3.55/742 CASE POSI, USED, CLUTCH TYPE, EXCELLENT CONDITION, NO ISSUES,INSPECTED, $675
The website for this one is http://www.rumblefishltd.net/ Anyone ever used this guy? For just a hundred more, I could have a new one and be rid of my extra case.
Ideas? Suggestions???
